diff --git a/bin/configs/swift5-any-codable.yaml b/bin/configs/swift5-any-codable.yaml
new file mode 100644
index 00000000000..62031951b9e
--- /dev/null
+++ b/bin/configs/swift5-any-codable.yaml
@@ -0,0 +1,10 @@
+generatorName: swift5
+outputDir: samples/client/petstore/swift5/anycodable
+inputSpec: modules/openapi-generator/src/test/resources/3_0/any_codable.yaml
+modelNamePrefix: Prefix
+modelNameSuffix: Suffix
+additionalProperties:
+  podAuthors: ""
+  podSummary: PetstoreClient
+  projectName: PetstoreClient
+  podHomepage: https://github.com/openapitools/openapi-generator
\ No newline at end of file
diff --git a/docs/generators/swift5.md b/docs/generators/swift5.md
index 72887e3b55f..474ff6b0629 100644
--- a/docs/generators/swift5.md
+++ b/docs/generators/swift5.md
@@ -74,6 +74,7 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 
 <ul class="column-ul">
 <li>Any</li>
+<li>AnyCodable</li>
 <li>AnyObject</li>
 <li>Bool</li>
 <li>Character</li>
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/Swift5ClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/Swift5ClientCodegen.java
index 5bd1dfb2db0..584e7720910 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/Swift5ClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/Swift5ClientCodegen.java
@@ -145,7 +145,8 @@ public class Swift5ClientCodegen extends DefaultCodegen implements CodegenConfig
                         "URL",
                         "AnyObject",
                         "Any",
-                        "Decimal")
+                        "Decimal",
+                        "AnyCodable") // from AnyCodable dependency
         );
         defaultIncludes = new HashSet<>(
                 Arrays.asList(
@@ -731,11 +732,11 @@ public class Swift5ClientCodegen extends DefaultCodegen implements CodegenConfig
         // FIXME parameter should not be assigned. Also declare it as "final"
         name = sanitizeName(name);
 
-        if (!StringUtils.isEmpty(modelNameSuffix)) { // set model suffix
+        if (!StringUtils.isEmpty(modelNameSuffix) && !isLanguageSpecificType(name)) { // set model suffix
             name = name + "_" + modelNameSuffix;
         }
 
-        if (!StringUtils.isEmpty(modelNamePrefix)) { // set model prefix
+        if (!StringUtils.isEmpty(modelNamePrefix) && !isLanguageSpecificType(name)) { // set model prefix
             name = modelNamePrefix + "_" + name;
         }
 
@@ -1086,6 +1087,10 @@ public class Swift5ClientCodegen extends DefaultCodegen implements CodegenConfig
                 LOWERCASE_FIRST_LETTER);
     }
 
+    private Boolean isLanguageSpecificType(String name) {
+        return languageSpecificPrimitives.contains(name);
+    }
+
     private String replaceSpecialCharacters(String name) {
         for (Map.Entry<String, String> specialCharacters : specialCharReplacements.entrySet()) {
             String specialChar = specialCharacters.getKey();
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/swift5/Swift5ClientCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/swift5/Swift5ClientCodegenTest.java
index 59928dbc266..d71bef08e80 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/swift5/Swift5ClientCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/swift5/Swift5ClientCodegenTest.java
@@ -166,6 +166,42 @@ public class Swift5ClientCodegenTest {
         Assert.assertEquals(op.bodyParam.dataType, "OpenAPIDateWithoutTime");
     }
 
+    @Test(description = "type from languageSpecificPrimitives should not be prefixed", enabled = true)
+    public void prefixExceptionTest() {
+        final DefaultCodegen codegen = new Swift5ClientCodegen();
+        codegen.setModelNamePrefix("API");
+
+        final String result = codegen.toModelName("AnyCodable");
+        Assert.assertEquals(result, "AnyCodable");
+    }
+
+    @Test(description = "type from languageSpecificPrimitives should not be suffixed", enabled = true)
+    public void suffixExceptionTest() {
+        final DefaultCodegen codegen = new Swift5ClientCodegen();
+        codegen.setModelNameSuffix("API");
+
+        final String result = codegen.toModelName("AnyCodable");
+        Assert.assertEquals(result, "AnyCodable");
+    }
+
+    @Test(description = "Other types should be prefixed", enabled = true)
+    public void prefixTest() {
+        final DefaultCodegen codegen = new Swift5ClientCodegen();
+        codegen.setModelNamePrefix("API");
+
+        final String result = codegen.toModelName("MyType");
+        Assert.assertEquals(result, "APIMyType");
+    }
+
+    @Test(description = "Other types should be suffixed", enabled = true)
+    public void suffixTest() {
+        final DefaultCodegen codegen = new Swift5ClientCodegen();
+        codegen.setModelNameSuffix("API");
+
+        final String result = codegen.toModelName("MyType");
+        Assert.assertEquals(result, "MyTypeAPI");
+    }
+
     @Test(enabled = true)
     public void testDefaultPodAuthors() throws Exception {
         // Given
diff --git a/modules/openapi-generator/src/test/resources/3_0/any_codable.yaml b/modules/openapi-generator/src/test/resources/3_0/any_codable.yaml
new file mode 100644
index 00000000000..00448b22ff6
--- /dev/null
+++ b/modules/openapi-generator/src/test/resources/3_0/any_codable.yaml
@@ -0,0 +1,45 @@
+openapi: "3.0.0"
+info:
+  version: 1.0.0
+  title: Swagger Petstore
+paths:
+   /pets:
+    get:
+      tags:
+        - pets
+      responses:
+        '200':
+          description: Expected response to a valid request
+          content:
+               application/json:
+                  schema:
+                     $ref: '#/components/schemas/Pet'
+   /pets/{petId}:
+    get:
+      summary: Info for a specific pet
+      operationId: showPetById
+      tags:
+        - pets
+      parameters:
+        - name: petId
+          in: path
+          required: true
+          description: The id of the pet to retrieve
+          schema:
+            type: string
+      responses:
+        '200':
+          description: Expected response to a valid request
+          content:
+            application/json:
+              schema:
+                type: object
+components:
+  schemas:
+    Pet:
+      type: object
+      properties:
+        testProperty:
+            type: string
+      required:
+        - testProperty
\ No newline at end of file
diff --git a/samples/client/petstore/swift5/anycodable/.gitignore b/samples/client/petstore/swift5/anycodable/.gitignore
new file mode 100644
index 00000000000..627d360a903
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/.gitignore
@@ -0,0 +1,105 @@
+# Created by https://www.toptal.com/developers/gitignore/api/swift,xcode
+# Edit at https://www.toptal.com/developers/gitignore?templates=swift,xcode
+
+### Swift ###
+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## User settings
+xcuserdata/
+
+## compatibility with Xcode 8 and earlier (ignoring not required starting Xcode 9)
+*.xcscmblueprint
+*.xccheckout
+
+## compatibility with Xcode 3 and earlier (ignoring not required starting Xcode 4)
+build/
+DerivedData/
+*.moved-aside
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+
+## Obj-C/Swift specific
+*.hmap
+
+## App packaging
+*.ipa
+*.dSYM.zip
+*.dSYM
+
+## Playgrounds
+timeline.xctimeline
+playground.xcworkspace
+
+# Swift Package Manager
+# Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
+# Packages/
+# Package.pins
+# Package.resolved
+# *.xcodeproj
+# Xcode automatically generates this directory with a .xcworkspacedata file and xcuserdata
+# hence it is not needed unless you have added a package configuration file to your project
+# .swiftpm
+
+.build/
+
+# CocoaPods
+# We recommend against adding the Pods directory to your .gitignore. However
+# you should judge for yourself, the pros and cons are mentioned at:
+# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
+# Pods/
+# Add this line if you want to avoid checking in source code from the Xcode workspace
+# *.xcworkspace
+
+# Carthage
+# Add this line if you want to avoid checking in source code from Carthage dependencies.
+# Carthage/Checkouts
+
+Carthage/Build/
+
+# Add this lines if you are using Accio dependency management (Deprecated since Xcode 12)
+# Dependencies/
+# .accio/
+
+# fastlane
+# It is recommended to not store the screenshots in the git repo.
+# Instead, use fastlane to re-generate the screenshots whenever they are needed.
+# For more information about the recommended setup visit:
+# https://docs.fastlane.tools/best-practices/source-control/#source-control
+
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots/**/*.png
+fastlane/test_output
+
+# Code Injection
+# After new code Injection tools there's a generated folder /iOSInjectionProject
+# https://github.com/johnno1962/injectionforxcode
+
+iOSInjectionProject/
+
+### Xcode ###
+# Xcode
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+
+
+
+## Gcc Patch
+/*.gcno
+
+### Xcode Patch ###
+*.xcodeproj/*
+!*.xcodeproj/project.pbxproj
+!*.xcodeproj/xcshareddata/
+!*.xcworkspace/contents.xcworkspacedata
+**/xcshareddata/WorkspaceSettings.xcsettings
+
+# End of https://www.toptal.com/developers/gitignore/api/swift,xcode
diff --git a/samples/client/petstore/swift5/anycodable/.openapi-generator-ignore b/samples/client/petstore/swift5/anycodable/.openapi-generator-ignore
new file mode 100644
index 00000000000..7484ee590a3
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/.openapi-generator-ignore
@@ -0,0 +1,23 @@
+# OpenAPI Generator Ignore
+# Generated by openapi-generator https://github.com/openapitools/openapi-generator
+
+# Use this file to prevent files from being overwritten by the generator.
+# The patterns follow closely to .gitignore or .dockerignore.
+
+# As an example, the C# client generator defines ApiClient.cs.
+# You can make changes and tell OpenAPI Generator to ignore just this file by uncommenting the following line:
+#ApiClient.cs
+
+# You can match any string of characters against a directory, file or extension with a single asterisk (*):
+#foo/*/qux
+# The above matches foo/bar/qux and foo/baz/qux, but not foo/bar/baz/qux
+
+# You can recursively match patterns against a directory, file or extension with a double asterisk (**):
+#foo/**/qux
+# This matches foo/bar/qux, foo/baz/qux, and foo/bar/baz/qux
+
+# You can also negate patterns with an exclamation (!).
+# For example, you can ignore all files in a docs folder with the file extension .md:
+#docs/*.md
+# Then explicitly reverse the ignore rule for a single file:
+#!docs/README.md
diff --git a/samples/client/petstore/swift5/anycodable/.openapi-generator/FILES b/samples/client/petstore/swift5/anycodable/.openapi-generator/FILES
new file mode 100644
index 00000000000..916770788c3
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/.openapi-generator/FILES
@@ -0,0 +1,24 @@
+.gitignore
+.swiftformat
+Cartfile
+Package.swift
+PetstoreClient.podspec
+PetstoreClient/Classes/OpenAPIs/APIHelper.swift
+PetstoreClient/Classes/OpenAPIs/APIs.swift
+PetstoreClient/Classes/OpenAPIs/APIs/PetsAPI.swift
+PetstoreClient/Classes/OpenAPIs/CodableHelper.swift
+PetstoreClient/Classes/OpenAPIs/Configuration.swift
+PetstoreClient/Classes/OpenAPIs/Extensions.swift
+PetstoreClient/Classes/OpenAPIs/JSONDataEncoding.swift
+PetstoreClient/Classes/OpenAPIs/JSONEncodingHelper.swift
+PetstoreClient/Classes/OpenAPIs/Models.swift
+PetstoreClient/Classes/OpenAPIs/Models/PrefixPetSuffix.swift
+PetstoreClient/Classes/OpenAPIs/OpenISO8601DateFormatter.swift
+PetstoreClient/Classes/OpenAPIs/SynchronizedDictionary.swift
+PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
+PetstoreClient/Classes/OpenAPIs/Validation.swift
+README.md
+docs/PetsAPI.md
+docs/PrefixPetSuffix.md
+git_push.sh
+project.yml
diff --git a/samples/client/petstore/swift5/anycodable/.openapi-generator/VERSION b/samples/client/petstore/swift5/anycodable/.openapi-generator/VERSION
new file mode 100644
index 00000000000..7f4d792ec2c
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/.openapi-generator/VERSION
@@ -0,0 +1 @@
+6.5.0-SNAPSHOT
\ No newline at end of file
diff --git a/samples/client/petstore/swift5/anycodable/.swiftformat b/samples/client/petstore/swift5/anycodable/.swiftformat
new file mode 100644
index 00000000000..93007252801
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/.swiftformat
@@ -0,0 +1,45 @@
+# This file is auto-generated by OpenAPI Generator: https://openapi-generator.tech/
+#
+# For rules on SwiftFormat, please refer to https://github.com/nicklockwood/SwiftFormat/blob/master/Rules.md
+#
+# file options
+
+# uncomment below to exclude files, folders
+#--exclude path/to/test1.swift,Snapshots,Build
+
+# format options
+
+--allman false
+--binarygrouping 4,8
+--commas always
+--comments indent
+--decimalgrouping 3,6
+--elseposition same-line
+--empty void
+--exponentcase lowercase
+--exponentgrouping disabled
+--fractiongrouping disabled
+--header ignore
+--hexgrouping 4,8
+--hexliteralcase uppercase
+--ifdef indent
+--indent 4
+--indentcase false
+--importgrouping testable-bottom
+--linebreaks lf
+--maxwidth none
+--octalgrouping 4,8
+--operatorfunc spaced
+--patternlet hoist
+--ranges spaced
+--self remove
+--semicolons inline
+--stripunusedargs always
+--swiftversion 5.4
+--trimwhitespace always
+--wraparguments preserve
+--wrapcollections preserve
+
+# rules
+
+--enable isEmpty
diff --git a/samples/client/petstore/swift5/anycodable/Cartfile b/samples/client/petstore/swift5/anycodable/Cartfile
new file mode 100644
index 00000000000..92bac174543
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/Cartfile
@@ -0,0 +1 @@
+github "Flight-School/AnyCodable" ~> 0.6
diff --git a/samples/client/petstore/swift5/anycodable/OpenAPIClient.podspec b/samples/client/petstore/swift5/anycodable/OpenAPIClient.podspec
new file mode 100644
index 00000000000..57d5e06e6e6
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/OpenAPIClient.podspec
@@ -0,0 +1,15 @@
+Pod::Spec.new do |s|
+  s.name = 'OpenAPIClient'
+  s.ios.deployment_target = '9.0'
+  s.osx.deployment_target = '10.11'
+  s.tvos.deployment_target = '9.0'
+  s.watchos.deployment_target = '3.0'
+  s.version = '1.0.0'
+  s.source = { :git => 'git@github.com:OpenAPITools/openapi-generator.git', :tag => 'v1.0.0' }
+  s.authors = 'OpenAPI Generator'
+  s.license = 'Proprietary'
+  s.homepage = 'https://github.com/OpenAPITools/openapi-generator'
+  s.summary = 'OpenAPIClient Swift SDK'
+  s.source_files = 'OpenAPIClient/Classes/**/*.swift'
+  s.dependency 'AnyCodable-FlightSchool', '~> 0.6'
+end
diff --git a/samples/client/petstore/swift5/anycodable/Package.swift b/samples/client/petstore/swift5/anycodable/Package.swift
new file mode 100644
index 00000000000..5335b0a3093
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/Package.swift
@@ -0,0 +1,33 @@
+// swift-tools-version:5.1
+
+import PackageDescription
+
+let package = Package(
+    name: "PetstoreClient",
+    platforms: [
+        .iOS(.v9),
+        .macOS(.v10_11),
+        .tvOS(.v9),
+        .watchOS(.v3),
+    ],
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "PetstoreClient",
+            targets: ["PetstoreClient"]
+        ),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        .package(url: "https://github.com/Flight-School/AnyCodable", .upToNextMajor(from: "0.6.1")),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "PetstoreClient",
+            dependencies: ["AnyCodable", ],
+            path: "PetstoreClient/Classes"
+        ),
+    ]
+)
diff --git a/samples/client/petstore/swift5/anycodable/PetstoreClient.podspec b/samples/client/petstore/swift5/anycodable/PetstoreClient.podspec
new file mode 100644
index 00000000000..4265bb2dc10
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/PetstoreClient.podspec
@@ -0,0 +1,15 @@
+Pod::Spec.new do |s|
+  s.name = 'PetstoreClient'
+  s.ios.deployment_target = '9.0'
+  s.osx.deployment_target = '10.11'
+  s.tvos.deployment_target = '9.0'
+  s.watchos.deployment_target = '3.0'
+  s.version = '1.0.0'
+  s.source = { :git => 'git@github.com:OpenAPITools/openapi-generator.git', :tag => 'v1.0.0' }
+  s.authors = ''
+  s.license = 'Proprietary'
+  s.homepage = 'https://github.com/openapitools/openapi-generator'
+  s.summary = 'PetstoreClient'
+  s.source_files = 'PetstoreClient/Classes/**/*.swift'
+  s.dependency 'AnyCodable-FlightSchool', '~> 0.6'
+end
diff --git a/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/APIHelper.swift b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/APIHelper.swift
new file mode 100644
index 00000000000..93c5c762602
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/APIHelper.swift
@@ -0,0 +1,119 @@
+// APIHelper.swift
+//
+// Generated by openapi-generator
+// https://openapi-generator.tech
+//
+
+import Foundation
+
+public struct APIHelper {
+    public static func rejectNil(_ source: [String: Any?]) -> [String: Any]? {
+        let destination = source.reduce(into: [String: Any]()) { result, item in
+            if let value = item.value {
+                result[item.key] = value
+            }
+        }
+
+        if destination.isEmpty {
+            return nil
+        }
+        return destination
+    }
+
+    public static func rejectNilHeaders(_ source: [String: Any?]) -> [String: String] {
+        return source.reduce(into: [String: String]()) { result, item in
+            if let collection = item.value as? [Any?] {
+                result[item.key] = collection
+                    .compactMap { value in convertAnyToString(value) }
+                    .joined(separator: ",")
+            } else if let value: Any = item.value {
+                result[item.key] = convertAnyToString(value)
+            }
+        }
+    }
+
+    public static func convertBoolToString(_ source: [String: Any]?) -> [String: Any]? {
+        guard let source = source else {
+            return nil
+        }
+
+        return source.reduce(into: [String: Any]()) { result, item in
+            switch item.value {
+            case let x as Bool:
+                result[item.key] = x.description
+            default:
+                result[item.key] = item.value
+            }
+        }
+    }
+
+    public static func convertAnyToString(_ value: Any?) -> String? {
+        guard let value = value else { return nil }
+        if let value = value as? any RawRepresentable {
+            return "\(value.rawValue)"
+        } else {
+            return "\(value)"
+        }
+    }
+
+    public static func mapValueToPathItem(_ source: Any) -> Any {
+        if let collection = source as? [Any?] {
+            return collection
+                .compactMap { value in convertAnyToString(value) }
+                .joined(separator: ",")
+        }
+        return source
+    }
+
+    /// maps all values from source to query parameters
+    ///
+    /// explode attribute is respected: collection values might be either joined or split up into separate key value pairs
+    public static func mapValuesToQueryItems(_ source: [String: (wrappedValue: Any?, isExplode: Bool)]) -> [URLQueryItem]? {
+        let destination = source.filter { $0.value.wrappedValue != nil }.reduce(into: [URLQueryItem]()) { result, item in
+            if let collection = item.value.wrappedValue as? [Any?] {
+
+                let collectionValues: [String] = collection.compactMap { value in convertAnyToString(value) }
+
+                if !item.value.isExplode {
+                    result.append(URLQueryItem(name: item.key, value: collectionValues.joined(separator: ",")))
+                } else {
+                    collectionValues
+                        .forEach { value in
+                            result.append(URLQueryItem(name: item.key, value: value))
+                        }
+                }
+
+            } else if let value = item.value.wrappedValue {
+                result.append(URLQueryItem(name: item.key, value: convertAnyToString(value)))
+            }
+        }
+
+        if destination.isEmpty {
+            return nil
+        }
+        return destination
+    }
+
+    /// maps all values from source to query parameters
+    ///
+    /// collection values are always exploded
+    public static func mapValuesToQueryItems(_ source: [String: Any?]) -> [URLQueryItem]? {
+        let destination = source.filter { $0.value != nil }.reduce(into: [URLQueryItem]()) { result, item in
+            if let collection = item.value as? [Any?] {
+                collection
+                    .compactMap { value in convertAnyToString(value) }
+                    .forEach { value in
+                        result.append(URLQueryItem(name: item.key, value: value))
+                    }
+
+            } else if let value = item.value {
+                result.append(URLQueryItem(name: item.key, value: convertAnyToString(value)))
+            }
+        }
+
+        if destination.isEmpty {
+            return nil
+        }
+        return destination
+    }
+}
diff --git a/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/APIs.swift b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/APIs.swift
new file mode 100644
index 00000000000..513c1222ada
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/APIs.swift
@@ -0,0 +1,75 @@
+// APIs.swift
+//
+// Generated by openapi-generator
+// https://openapi-generator.tech
+//
+
+import Foundation
+
+// We reverted the change of PetstoreClientAPI to PetstoreClient introduced in https://github.com/OpenAPITools/openapi-generator/pull/9624
+// Because it was causing the following issue https://github.com/OpenAPITools/openapi-generator/issues/9953
+// If you are affected by this issue, please consider removing the following two lines,
+// By setting the option removeMigrationProjectNameClass to true in the generator
+@available(*, deprecated, renamed: "PetstoreClientAPI")
+public typealias PetstoreClient = PetstoreClientAPI
+
+open class PetstoreClientAPI {
+    public static var basePath = "http://localhost"
+    public static var customHeaders: [String: String] = [:]
+    public static var credential: URLCredential?
+    public static var requestBuilderFactory: RequestBuilderFactory = URLSessionRequestBuilderFactory()
+    public static var apiResponseQueue: DispatchQueue = .main
+}
+
+open class RequestBuilder<T> {
+    var credential: URLCredential?
+    var headers: [String: String]
+    public let parameters: [String: Any]?
+    public let method: String
+    public let URLString: String
+    public let requestTask: RequestTask = RequestTask()
+    public let requiresAuthentication: Bool
+
+    /// Optional block to obtain a reference to the request's progress instance when available.
+    /// With the URLSession http client the request's progress only works on iOS 11.0, macOS 10.13, macCatalyst 13.0, tvOS 11.0, watchOS 4.0.
+    /// If you need to get the request's progress in older OS versions, please use Alamofire http client.
+    public var onProgressReady: ((Progress) -> Void)?
+
+    required public init(method: String, URLString: String, parameters: [String: Any]?, headers: [String: String] = [:], requiresAuthentication: Bool) {
+        self.method = method
+        self.URLString = URLString
+        self.parameters = parameters
+        self.headers = headers
+        self.requiresAuthentication = requiresAuthentication
+
+        addHeaders(PetstoreClientAPI.customHeaders)
+    }
+
+    open func addHeaders(_ aHeaders: [String: String]) {
+        for (header, value) in aHeaders {
+            headers[header] = value
+        }
+    }
+
+    @discardableResult
+    open func execute(_ apiResponseQueue: DispatchQueue = PetstoreClientAPI.apiResponseQueue, _ completion: @escaping (_ result: Swift.Result<Response<T>, ErrorResponse>) -> Void) -> RequestTask {
+        return requestTask
+    }
+
+    public func addHeader(name: String, value: String) -> Self {
+        if !value.isEmpty {
+            headers[name] = value
+        }
+        return self
+    }
+
+    open func addCredential() -> Self {
+        credential = PetstoreClientAPI.credential
+        return self
+    }
+}
+
+public protocol RequestBuilderFactory {
+    func getNonDecodableBuilder<T>() -> RequestBuilder<T>.Type
+    func getBuilder<T: Decodable>() -> RequestBuilder<T>.Type
+}
diff --git a/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/APIs/PetsAPI.swift b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/APIs/PetsAPI.swift
new file mode 100644
index 00000000000..03222c67a75
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/APIs/PetsAPI.swift
@@ -0,0 +1,99 @@
+//
+// PetsAPI.swift
+//
+// Generated by openapi-generator
+// https://openapi-generator.tech
+//
+
+import Foundation
+#if canImport(AnyCodable)
+import AnyCodable
+#endif
+
+open class PetsAPI {
+
+    /**
+
+     - parameter apiResponseQueue: The queue on which api response is dispatched.
+     - parameter completion: completion handler to receive the data and the error objects
+     */
+    @discardableResult
+    open class func petsGet(apiResponseQueue: DispatchQueue = PetstoreClientAPI.apiResponseQueue, completion: @escaping ((_ data: PrefixPetSuffix?, _ error: Error?) -> Void)) -> RequestTask {
+        return petsGetWithRequestBuilder().execute(apiResponseQueue) { result in
+            switch result {
+            case let .success(response):
+                completion(response.body, nil)
+            case let .failure(error):
+                completion(nil, error)
+            }
+        }
+    }
+
+    /**
+     - GET /pets
+     - returns: RequestBuilder<PrefixPetSuffix> 
+     */
+    open class func petsGetWithRequestBuilder() -> RequestBuilder<PrefixPetSuffix> {
+        let localVariablePath = "/pets"
+        let localVariableURLString = PetstoreClientAPI.basePath + localVariablePath
+        let localVariableParameters: [String: Any]? = nil
+
+        let localVariableUrlComponents = URLComponents(string: localVariableURLString)
+
+        let localVariableNillableHeaders: [String: Any?] = [
+            :
+        ]
+
+        let localVariableHeaderParameters = APIHelper.rejectNilHeaders(localVariableNillableHeaders)
+
+        let localVariableRequestBuilder: RequestBuilder<PrefixPetSuffix>.Type = PetstoreClientAPI.requestBuilderFactory.getBuilder()
+
+        return localVariableRequestBuilder.init(method: "GET", URLString: (localVariableUrlComponents?.string ?? localVariableURLString), parameters: localVariableParameters, headers: localVariableHeaderParameters, requiresAuthentication: false)
+    }
+
+    /**
+     Info for a specific pet
+     
+     - parameter petId: (path) The id of the pet to retrieve 
+     - parameter apiResponseQueue: The queue on which api response is dispatched.
+     - parameter completion: completion handler to receive the data and the error objects
+     */
+    @discardableResult
+    open class func showPetById(petId: String, apiResponseQueue: DispatchQueue = PetstoreClientAPI.apiResponseQueue, completion: @escaping ((_ data: AnyCodable?, _ error: Error?) -> Void)) -> RequestTask {
+        return showPetByIdWithRequestBuilder(petId: petId).execute(apiResponseQueue) { result in
+            switch result {
+            case let .success(response):
+                completion(response.body, nil)
+            case let .failure(error):
+                completion(nil, error)
+            }
+        }
+    }
+
+    /**
+     Info for a specific pet
+     - GET /pets/{petId}
+     - parameter petId: (path) The id of the pet to retrieve 
+     - returns: RequestBuilder<AnyCodable> 
+     */
+    open class func showPetByIdWithRequestBuilder(petId: String) -> RequestBuilder<AnyCodable> {
+        var localVariablePath = "/pets/{petId}"
+        let petIdPreEscape = "\(APIHelper.mapValueToPathItem(petId))"
+        let petIdPostEscape = petIdPreEscape.addingPercentEncoding(withAllowedCharacters: .urlPathAllowed) ?? ""
+        localVariablePath = localVariablePath.replacingOccurrences(of: "{petId}", with: petIdPostEscape, options: .literal, range: nil)
+        let localVariableURLString = PetstoreClientAPI.basePath + localVariablePath
+        let localVariableParameters: [String: Any]? = nil
+
+        let localVariableUrlComponents = URLComponents(string: localVariableURLString)
+
+        let localVariableNillableHeaders: [String: Any?] = [
+            :
+        ]
+
+        let localVariableHeaderParameters = APIHelper.rejectNilHeaders(localVariableNillableHeaders)
+
+        let localVariableRequestBuilder: RequestBuilder<AnyCodable>.Type = PetstoreClientAPI.requestBuilderFactory.getBuilder()
+
+        return localVariableRequestBuilder.init(method: "GET", URLString: (localVariableUrlComponents?.string ?? localVariableURLString), parameters: localVariableParameters, headers: localVariableHeaderParameters, requiresAuthentication: false)
+    }
+}
diff --git a/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/CodableHelper.swift b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/CodableHelper.swift
new file mode 100644
index 00000000000..09c82e53e13
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/CodableHelper.swift
@@ -0,0 +1,49 @@
+//
+// CodableHelper.swift
+//
+// Generated by openapi-generator
+// https://openapi-generator.tech
+//
+
+import Foundation
+
+open class CodableHelper {
+    private static var customDateFormatter: DateFormatter?
+    private static var defaultDateFormatter: DateFormatter = OpenISO8601DateFormatter()
+
+    private static var customJSONDecoder: JSONDecoder?
+    private static var defaultJSONDecoder: JSONDecoder = {
+        let decoder = JSONDecoder()
+        decoder.dateDecodingStrategy = .formatted(CodableHelper.dateFormatter)
+        return decoder
+    }()
+
+    private static var customJSONEncoder: JSONEncoder?
+    private static var defaultJSONEncoder: JSONEncoder = {
+        let encoder = JSONEncoder()
+        encoder.dateEncodingStrategy = .formatted(CodableHelper.dateFormatter)
+        encoder.outputFormatting = .prettyPrinted
+        return encoder
+    }()
+
+    public static var dateFormatter: DateFormatter {
+        get { return customDateFormatter ?? defaultDateFormatter }
+        set { customDateFormatter = newValue }
+    }
+    public static var jsonDecoder: JSONDecoder {
+        get { return customJSONDecoder ?? defaultJSONDecoder }
+        set { customJSONDecoder = newValue }
+    }
+    public static var jsonEncoder: JSONEncoder {
+        get { return customJSONEncoder ?? defaultJSONEncoder }
+        set { customJSONEncoder = newValue }
+    }
+
+    open class func decode<T>(_ type: T.Type, from data: Data) -> Swift.Result<T, Error> where T: Decodable {
+        return Swift.Result { try jsonDecoder.decode(type, from: data) }
+    }
+
+    open class func encode<T>(_ value: T) -> Swift.Result<Data, Error> where T: Encodable {
+        return Swift.Result { try jsonEncoder.encode(value) }
+    }
+}
diff --git a/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/Configuration.swift b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/Configuration.swift
new file mode 100644
index 00000000000..03789f4b492
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/Configuration.swift
@@ -0,0 +1,19 @@
+// Configuration.swift
+//
+// Generated by openapi-generator
+// https://openapi-generator.tech
+//
+
+import Foundation
+
+open class Configuration {
+    
+    // This value is used to configure the date formatter that is used to serialize dates into JSON format.
+    // You must set it prior to encoding any dates, and it will only be read once.
+    @available(*, unavailable, message: "To set a different date format, use CodableHelper.dateFormatter instead.")
+    public static var dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZZZZZ"
+    /// Configures the range of HTTP status codes that will result in a successful response
+    ///
+    /// If a HTTP status code is outside of this range the response will be interpreted as failed.
+    public static var successfulStatusCodeRange: Range = 200..<300
+}
diff --git a/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/Extensions.swift b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/Extensions.swift
new file mode 100644
index 00000000000..d12fa0fb513
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/Extensions.swift
@@ -0,0 +1,230 @@
+// Extensions.swift
+//
+// Generated by openapi-generator
+// https://openapi-generator.tech
+//
+
+import Foundation
+#if canImport(AnyCodable)
+import AnyCodable
+#endif
+
+extension Bool: JSONEncodable {
+    func encodeToJSON() -> Any { self }
+}
+
+extension Float: JSONEncodable {
+    func encodeToJSON() -> Any { self }
+}
+
+extension Int: JSONEncodable {
+    func encodeToJSON() -> Any { self }
+}
+
+extension Int32: JSONEncodable {
+    func encodeToJSON() -> Any { self }
+}
+
+extension Int64: JSONEncodable {
+    func encodeToJSON() -> Any { self }
+}
+
+extension Double: JSONEncodable {
+    func encodeToJSON() -> Any { self }
+}
+
+extension Decimal: JSONEncodable {
+    func encodeToJSON() -> Any { self }
+}
+
+extension String: JSONEncodable {
+    func encodeToJSON() -> Any { self }
+}
+
+extension URL: JSONEncodable {
+    func encodeToJSON() -> Any { self }
+}
+
+extension UUID: JSONEncodable {
+    func encodeToJSON() -> Any { self }
+}
+
+extension RawRepresentable where RawValue: JSONEncodable {
+    func encodeToJSON() -> Any { return self.rawValue }
+}
+
+private func encodeIfPossible<T>(_ object: T) -> Any {
+    if let encodableObject = object as? JSONEncodable {
+        return encodableObject.encodeToJSON()
+    } else {
+        return object
+    }
+}
+
+extension Array: JSONEncodable {
+    func encodeToJSON() -> Any {
+        return self.map(encodeIfPossible)
+    }
+}
+
+extension Set: JSONEncodable {
+    func encodeToJSON() -> Any {
+        return Array(self).encodeToJSON()
+    }
+}
+
+extension Dictionary: JSONEncodable {
+    func encodeToJSON() -> Any {
+        var dictionary = [AnyHashable: Any]()
+        for (key, value) in self {
+            dictionary[key] = encodeIfPossible(value)
+        }
+        return dictionary
+    }
+}
+
+extension Data: JSONEncodable {
+    func encodeToJSON() -> Any {
+        return self.base64EncodedString(options: Data.Base64EncodingOptions())
+    }
+}
+
+extension Date: JSONEncodable {
+    func encodeToJSON() -> Any {
+        return CodableHelper.dateFormatter.string(from: self)
+    }
+}
+
+extension JSONEncodable where Self: Encodable {
+    func encodeToJSON() -> Any {
+        guard let data = try? CodableHelper.jsonEncoder.encode(self) else {
+            fatalError("Could not encode to json: \(self)")
+        }
+        return data.encodeToJSON()
+    }
+}
+
+extension String: CodingKey {
+
+    public var stringValue: String {
+        return self
+    }
+
+    public init?(stringValue: String) {
+        self.init(stringLiteral: stringValue)
+    }
+
+    public var intValue: Int? {
+        return nil
+    }
+
+    public init?(intValue: Int) {
+        return nil
+    }
+
+}
+
+extension KeyedEncodingContainerProtocol {
+
+    public mutating func encodeArray<T>(_ values: [T], forKey key: Self.Key) throws where T: Encodable {
+        var arrayContainer = nestedUnkeyedContainer(forKey: key)
+        try arrayContainer.encode(contentsOf: values)
+    }
+
+    public mutating func encodeArrayIfPresent<T>(_ values: [T]?, forKey key: Self.Key) throws where T: Encodable {
+        if let values = values {
+            try encodeArray(values, forKey: key)
+        }
+    }
+
+    public mutating func encodeMap<T>(_ pairs: [Self.Key: T]) throws where T: Encodable {
+        for (key, value) in pairs {
+            try encode(value, forKey: key)
+        }
+    }
+
+    public mutating func encodeMapIfPresent<T>(_ pairs: [Self.Key: T]?) throws where T: Encodable {
+        if let pairs = pairs {
+            try encodeMap(pairs)
+        }
+    }
+
+    public mutating func encode(_ value: Decimal, forKey key: Self.Key) throws {
+        var mutableValue = value
+        let stringValue = NSDecimalString(&mutableValue, Locale(identifier: "en_US"))
+        try encode(stringValue, forKey: key)
+    }
+
+    public mutating func encodeIfPresent(_ value: Decimal?, forKey key: Self.Key) throws {
+        if let value = value {
+            try encode(value, forKey: key)
+        }
+    }
+}
+
+extension KeyedDecodingContainerProtocol {
+
+    public func decodeArray<T>(_ type: T.Type, forKey key: Self.Key) throws -> [T] where T: Decodable {
+        var tmpArray = [T]()
+
+        var nestedContainer = try nestedUnkeyedContainer(forKey: key)
+        while !nestedContainer.isAtEnd {
+            let arrayValue = try nestedContainer.decode(T.self)
+            tmpArray.append(arrayValue)
+        }
+
+        return tmpArray
+    }
+
+    public func decodeArrayIfPresent<T>(_ type: T.Type, forKey key: Self.Key) throws -> [T]? where T: Decodable {
+        var tmpArray: [T]?
+
+        if contains(key) {
+            tmpArray = try decodeArray(T.self, forKey: key)
+        }
+
+        return tmpArray
+    }
+
+    public func decodeMap<T>(_ type: T.Type, excludedKeys: Set<Self.Key>) throws -> [Self.Key: T] where T: Decodable {
+        var map: [Self.Key: T] = [:]
+
+        for key in allKeys {
+            if !excludedKeys.contains(key) {
+                let value = try decode(T.self, forKey: key)
+                map[key] = value
+            }
+        }
+
+        return map
+    }
+
+    public func decode(_ type: Decimal.Type, forKey key: Self.Key) throws -> Decimal {
+        let stringValue = try decode(String.self, forKey: key)
+        guard let decimalValue = Decimal(string: stringValue) else {
+            let context = DecodingError.Context(codingPath: [key], debugDescription: "The key \(key) couldn't be converted to a Decimal value")
+            throw DecodingError.typeMismatch(type, context)
+        }
+
+        return decimalValue
+    }
+
+    public func decodeIfPresent(_ type: Decimal.Type, forKey key: Self.Key) throws -> Decimal? {
+        guard let stringValue = try decodeIfPresent(String.self, forKey: key) else {
+            return nil
+        }
+        guard let decimalValue = Decimal(string: stringValue) else {
+            let context = DecodingError.Context(codingPath: [key], debugDescription: "The key \(key) couldn't be converted to a Decimal value")
+            throw DecodingError.typeMismatch(type, context)
+        }
+
+        return decimalValue
+    }
+
+}
+
+extension HTTPURLResponse {
+    var isStatusCodeSuccessful: Bool {
+        return Configuration.successfulStatusCodeRange.contains(statusCode)
+    }
+}
diff --git a/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/JSONDataEncoding.swift b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/JSONDataEncoding.swift
new file mode 100644
index 00000000000..b79e9f5e64d
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/JSONDataEncoding.swift
@@ -0,0 +1,53 @@
+//
+// JSONDataEncoding.swift
+//
+// Generated by openapi-generator
+// https://openapi-generator.tech
+//
+
+import Foundation
+
+public struct JSONDataEncoding {
+
+    // MARK: Properties
+
+    private static let jsonDataKey = "jsonData"
+
+    // MARK: Encoding
+
+    /// Creates a URL request by encoding parameters and applying them onto an existing request.
+    ///
+    /// - parameter urlRequest: The request to have parameters applied.
+    /// - parameter parameters: The parameters to apply. This should have a single key/value
+    ///                         pair with "jsonData" as the key and a Data object as the value.
+    ///
+    /// - throws: An `Error` if the encoding process encounters an error.
+    ///
+    /// - returns: The encoded request.
+    public func encode(_ urlRequest: URLRequest, with parameters: [String: Any]?) -> URLRequest {
+        var urlRequest = urlRequest
+
+        guard let jsonData = parameters?[JSONDataEncoding.jsonDataKey] as? Data, !jsonData.isEmpty else {
+            return urlRequest
+        }
+
+        if urlRequest.value(forHTTPHeaderField: "Content-Type") == nil {
+            urlRequest.setValue("application/json", forHTTPHeaderField: "Content-Type")
+        }
+
+        urlRequest.httpBody = jsonData
+
+        return urlRequest
+    }
+
+    public static func encodingParameters(jsonData: Data?) -> [String: Any]? {
+        var returnedParams: [String: Any]?
+        if let jsonData = jsonData, !jsonData.isEmpty {
+            var params: [String: Any] = [:]
+            params[jsonDataKey] = jsonData
+            returnedParams = params
+        }
+        return returnedParams
+    }
+
+}
diff --git a/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/JSONEncodingHelper.swift b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/JSONEncodingHelper.swift
new file mode 100644
index 00000000000..02f78ffb470
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/JSONEncodingHelper.swift
@@ -0,0 +1,45 @@
+//
+// JSONEncodingHelper.swift
+//
+// Generated by openapi-generator
+// https://openapi-generator.tech
+//
+
+import Foundation
+
+open class JSONEncodingHelper {
+
+    open class func encodingParameters<T: Encodable>(forEncodableObject encodableObj: T?) -> [String: Any]? {
+        var params: [String: Any]?
+
+        // Encode the Encodable object
+        if let encodableObj = encodableObj {
+            let encodeResult = CodableHelper.encode(encodableObj)
+            do {
+                let data = try encodeResult.get()
+                params = JSONDataEncoding.encodingParameters(jsonData: data)
+            } catch {
+                print(error.localizedDescription)
+            }
+        }
+
+        return params
+    }
+
+    open class func encodingParameters(forEncodableObject encodableObj: Any?) -> [String: Any]? {
+        var params: [String: Any]?
+
+        if let encodableObj = encodableObj {
+            do {
+                let data = try JSONSerialization.data(withJSONObject: encodableObj, options: .prettyPrinted)
+                params = JSONDataEncoding.encodingParameters(jsonData: data)
+            } catch {
+                print(error.localizedDescription)
+                return nil
+            }
+        }
+
+        return params
+    }
+
+}
diff --git a/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/Models.swift b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/Models.swift
new file mode 100644
index 00000000000..b73c2b8fde0
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/Models.swift
@@ -0,0 +1,126 @@
+// Models.swift
+//
+// Generated by openapi-generator
+// https://openapi-generator.tech
+//
+
+import Foundation
+
+protocol JSONEncodable {
+    func encodeToJSON() -> Any
+}
+
+/// An enum where the last case value can be used as a default catch-all.
+protocol CaseIterableDefaultsLast: Decodable & CaseIterable & RawRepresentable
+where RawValue: Decodable, AllCases: BidirectionalCollection {}
+
+extension CaseIterableDefaultsLast {
+    /// Initializes an enum such that if a known raw value is found, then it is decoded.
+    /// Otherwise the last case is used.
+    /// - Parameter decoder: A decoder.
+    public init(from decoder: Decoder) throws {
+        if let value = try Self(rawValue: decoder.singleValueContainer().decode(RawValue.self)) {
+            self = value
+        } else if let lastValue = Self.allCases.last {
+            self = lastValue
+        } else {
+            throw DecodingError.valueNotFound(
+                Self.Type.self,
+                .init(codingPath: decoder.codingPath, debugDescription: "CaseIterableDefaultsLast")
+            )
+        }
+    }
+}
+
+/// A flexible type that can be encoded (`.encodeNull` or `.encodeValue`)
+/// or not encoded (`.encodeNothing`). Intended for request payloads.
+public enum NullEncodable<Wrapped: Hashable>: Hashable {
+    case encodeNothing
+    case encodeNull
+    case encodeValue(Wrapped)
+}
+
+extension NullEncodable: Codable where Wrapped: Codable {
+    public init(from decoder: Decoder) throws {
+        let container = try decoder.singleValueContainer()
+        if let value = try? container.decode(Wrapped.self) {
+            self = .encodeValue(value)
+        } else if container.decodeNil() {
+            self = .encodeNull
+        } else {
+            self = .encodeNothing
+        }
+    }
+
+    public func encode(to encoder: Encoder) throws {
+        var container = encoder.singleValueContainer()
+        switch self {
+        case .encodeNothing: return
+        case .encodeNull: try container.encodeNil()
+        case .encodeValue(let wrapped): try container.encode(wrapped)
+        }
+    }
+}
+
+public enum ErrorResponse: Error {
+    case error(Int, Data?, URLResponse?, Error)
+}
+
+public enum DownloadException: Error {
+    case responseDataMissing
+    case responseFailed
+    case requestMissing
+    case requestMissingPath
+    case requestMissingURL
+}
+
+public enum DecodableRequestBuilderError: Error {
+    case emptyDataResponse
+    case nilHTTPResponse
+    case unsuccessfulHTTPStatusCode
+    case jsonDecoding(DecodingError)
+    case generalError(Error)
+}
+
+open class Response<T> {
+    public let statusCode: Int
+    public let header: [String: String]
+    public let body: T
+    public let bodyData: Data?
+
+    public init(statusCode: Int, header: [String: String], body: T, bodyData: Data?) {
+        self.statusCode = statusCode
+        self.header = header
+        self.body = body
+        self.bodyData = bodyData
+    }
+
+    public convenience init(response: HTTPURLResponse, body: T, bodyData: Data?) {
+        let rawHeader = response.allHeaderFields
+        var header = [String: String]()
+        for (key, value) in rawHeader {
+            if let key = key.base as? String, let value = value as? String {
+                header[key] = value
+            }
+        }
+        self.init(statusCode: response.statusCode, header: header, body: body, bodyData: bodyData)
+    }
+}
+
+public final class RequestTask {
+    private var lock = NSRecursiveLock()
+    private var task: URLSessionTask?
+
+    internal func set(task: URLSessionTask) {
+        lock.lock()
+        defer { lock.unlock() }
+        self.task = task
+    }
+
+    public func cancel() {
+        lock.lock()
+        defer { lock.unlock() }
+        task?.cancel()
+        task = nil
+    }
+}
diff --git a/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/Models/PrefixPetSuffix.swift b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/Models/PrefixPetSuffix.swift
new file mode 100644
index 00000000000..183f8eeb770
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/Models/PrefixPetSuffix.swift
@@ -0,0 +1,32 @@
+//
+// PrefixPetSuffix.swift
+//
+// Generated by openapi-generator
+// https://openapi-generator.tech
+//
+
+import Foundation
+#if canImport(AnyCodable)
+import AnyCodable
+#endif
+
+public struct PrefixPetSuffix: Codable, JSONEncodable, Hashable {
+
+    public var testProperty: String
+
+    public init(testProperty: String) {
+        self.testProperty = testProperty
+    }
+
+    public enum CodingKeys: String, CodingKey, CaseIterable {
+        case testProperty
+    }
+
+    // Encodable protocol methods
+
+    public func encode(to encoder: Encoder) throws {
+        var container = encoder.container(keyedBy: CodingKeys.self)
+        try container.encode(testProperty, forKey: .testProperty)
+    }
+}
+
diff --git a/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/OpenISO8601DateFormatter.swift b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/OpenISO8601DateFormatter.swift
new file mode 100644
index 00000000000..cc3288805f1
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/OpenISO8601DateFormatter.swift
@@ -0,0 +1,56 @@
+//
+// OpenISO8601DateFormatter.swift
+//
+// Generated by openapi-generator
+// https://openapi-generator.tech
+//
+
+import Foundation
+
+// https://stackoverflow.com/a/50281094/976628
+public class OpenISO8601DateFormatter: DateFormatter {
+    static let withoutSeconds: DateFormatter = {
+        let formatter = DateFormatter()
+        formatter.calendar = Calendar(identifier: .iso8601)
+        formatter.locale = Locale(identifier: "en_US_POSIX")
+        formatter.timeZone = TimeZone(secondsFromGMT: 0)
+        formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZZZZZ"
+        return formatter
+    }()
+
+    static let withoutTime: DateFormatter = {
+        let formatter = DateFormatter()
+        formatter.calendar = Calendar(identifier: .iso8601)
+        formatter.locale = Locale(identifier: "en_US_POSIX")
+        formatter.timeZone = TimeZone(secondsFromGMT: 0)
+        formatter.dateFormat = "yyyy-MM-dd"
+        return formatter
+    }()
+
+    private func setup() {
+        calendar = Calendar(identifier: .iso8601)
+        locale = Locale(identifier: "en_US_POSIX")
+        timeZone = TimeZone(secondsFromGMT: 0)
+        dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZZZZZ"
+    }
+
+    override init() {
+        super.init()
+        setup()
+    }
+
+    required init?(coder aDecoder: NSCoder) {
+        super.init(coder: aDecoder)
+        setup()
+    }
+
+    override public func date(from string: String) -> Date? {
+        if let result = super.date(from: string) {
+            return result
+        } else if let result = OpenISO8601DateFormatter.withoutSeconds.date(from: string) {
+            return result
+        }
+
+        return OpenISO8601DateFormatter.withoutTime.date(from: string)
+    }
+}
diff --git a/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/SynchronizedDictionary.swift b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/SynchronizedDictionary.swift
new file mode 100644
index 00000000000..acf7ff4031b
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/SynchronizedDictionary.swift
@@ -0,0 +1,36 @@
+// SynchronizedDictionary.swift
+//
+// Generated by openapi-generator
+// https://openapi-generator.tech
+//
+
+import Foundation
+
+internal struct SynchronizedDictionary<K: Hashable, V> {
+
+    private var dictionary = [K: V]()
+    private let queue = DispatchQueue(
+        label: "SynchronizedDictionary",
+        qos: DispatchQoS.userInitiated,
+        attributes: [DispatchQueue.Attributes.concurrent],
+        autoreleaseFrequency: DispatchQueue.AutoreleaseFrequency.inherit,
+        target: nil
+    )
+
+    internal subscript(key: K) -> V? {
+        get {
+            var value: V?
+
+            queue.sync {
+                value = self.dictionary[key]
+            }
+
+            return value
+        }
+        set {
+            queue.sync(flags: DispatchWorkItemFlags.barrier) {
+                self.dictionary[key] = newValue
+            }
+        }
+    }
+}
diff --git a/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
new file mode 100644
index 00000000000..635c69cd6a8
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/URLSessionImplementations.swift
@@ -0,0 +1,641 @@
+// URLSessionImplementations.swift
+//
+// Generated by openapi-generator
+// https://openapi-generator.tech
+//
+
+import Foundation
+#if !os(macOS)
+import MobileCoreServices
+#endif
+
+public protocol URLSessionProtocol {
+    func dataTask(with request: URLRequest, completionHandler: @escaping @Sendable (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask
+}
+
+extension URLSession: URLSessionProtocol {}
+
+class URLSessionRequestBuilderFactory: RequestBuilderFactory {
+    func getNonDecodableBuilder<T>() -> RequestBuilder<T>.Type {
+        return URLSessionRequestBuilder<T>.self
+    }
+
+    func getBuilder<T: Decodable>() -> RequestBuilder<T>.Type {
+        return URLSessionDecodableRequestBuilder<T>.self
+    }
+}
+
+public typealias PetstoreClientAPIChallengeHandler = ((URLSession, URLSessionTask, URLAuthenticationChallenge) -> (URLSession.AuthChallengeDisposition, URLCredential?))
+
+// Store the URLSession's delegate to retain its reference
+private let sessionDelegate = SessionDelegate()
+
+// Store the URLSession to retain its reference
+private let defaultURLSession = URLSession(configuration: .default, delegate: sessionDelegate, delegateQueue: nil)
+
+// Store current taskDidReceiveChallenge for every URLSessionTask
+private var challengeHandlerStore = SynchronizedDictionary<Int, PetstoreClientAPIChallengeHandler>()
+
+// Store current URLCredential for every URLSessionTask
+private var credentialStore = SynchronizedDictionary<Int, URLCredential>()
+
+open class URLSessionRequestBuilder<T>: RequestBuilder<T> {
+
+    /**
+     May be assigned if you want to control the authentication challenges.
+     */
+    public var taskDidReceiveChallenge: PetstoreClientAPIChallengeHandler?
+
+    /**
+     May be assigned if you want to do any of those things:
+     - control the task completion
+     - intercept and handle errors like authorization
+     - retry the request.
+     */
+    @available(*, deprecated, message: "Please override execute() method to intercept and handle errors like authorization or retry the request. Check the Wiki for more info. https://github.com/OpenAPITools/openapi-generator/wiki/FAQ#how-do-i-implement-bearer-token-authentication-with-urlsession-on-the-swift-api-client")
+    public var taskCompletionShouldRetry: ((Data?, URLResponse?, Error?, @escaping (Bool) -> Void) -> Void)?
+
+    required public init(method: String, URLString: String, parameters: [String: Any]?, headers: [String: String] = [:], requiresAuthentication: Bool) {
+        super.init(method: method, URLString: URLString, parameters: parameters, headers: headers, requiresAuthentication: requiresAuthentication)
+    }
+
+    /**
+     May be overridden by a subclass if you want to control the URLSession
+     configuration.
+     */
+    open func createURLSession() -> URLSessionProtocol {
+        return defaultURLSession
+    }
+
+    /**
+     May be overridden by a subclass if you want to control the Content-Type
+     that is given to an uploaded form part.
+
+     Return nil to use the default behavior (inferring the Content-Type from
+     the file extension).  Return the desired Content-Type otherwise.
+     */
+    open func contentTypeForFormPart(fileURL: URL) -> String? {
+        return nil
+    }
+
+    /**
+     May be overridden by a subclass if you want to control the URLRequest
+     configuration (e.g. to override the cache policy).
+     */
+    open func createURLRequest(urlSession: URLSessionProtocol, method: HTTPMethod, encoding: ParameterEncoding, headers: [String: String]) throws -> URLRequest {
+
+        guard let url = URL(string: URLString) else {
+            throw DownloadException.requestMissingURL
+        }
+
+        var originalRequest = URLRequest(url: url)
+
+        originalRequest.httpMethod = method.rawValue
+
+        headers.forEach { key, value in
+            originalRequest.setValue(value, forHTTPHeaderField: key)
+        }
+
+        buildHeaders().forEach { key, value in
+            originalRequest.setValue(value, forHTTPHeaderField: key)
+        }
+
+        let modifiedRequest = try encoding.encode(originalRequest, with: parameters)
+
+        return modifiedRequest
+    }
+
+    @discardableResult
+    override open func execute(_ apiResponseQueue: DispatchQueue = PetstoreClientAPI.apiResponseQueue, _ completion: @escaping (_ result: Swift.Result<Response<T>, ErrorResponse>) -> Void) -> RequestTask {
+        let urlSession = createURLSession()
+
+        guard let xMethod = HTTPMethod(rawValue: method) else {
+            fatalError("Unsupported Http method - \(method)")
+        }
+
+        let encoding: ParameterEncoding
+
+        switch xMethod {
+        case .get, .head:
+            encoding = URLEncoding()
+
+        case .options, .post, .put, .patch, .delete, .trace, .connect:
+            let contentType = headers["Content-Type"] ?? "application/json"
+
+            if contentType.hasPrefix("application/json") {
+                encoding = JSONDataEncoding()
+            } else if contentType.hasPrefix("multipart/form-data") {
+                encoding = FormDataEncoding(contentTypeForFormPart: contentTypeForFormPart(fileURL:))
+            } else if contentType.hasPrefix("application/x-www-form-urlencoded") {
+                encoding = FormURLEncoding()
+            } else {
+                fatalError("Unsupported Media Type - \(contentType)")
+            }
+        }
+
+        do {
+            let request = try createURLRequest(urlSession: urlSession, method: xMethod, encoding: encoding, headers: headers)
+
+            var taskIdentifier: Int?
+             let cleanupRequest = {
+                 if let taskIdentifier = taskIdentifier {
+                     challengeHandlerStore[taskIdentifier] = nil
+                     credentialStore[taskIdentifier] = nil
+                 }
+             }
+
+            let dataTask = urlSession.dataTask(with: request) { data, response, error in
+
+                if let taskCompletionShouldRetry = self.taskCompletionShouldRetry {
+
+                    taskCompletionShouldRetry(data, response, error) { shouldRetry in
+
+                        if shouldRetry {
+                            cleanupRequest()
+                            self.execute(apiResponseQueue, completion)
+                        } else {
+                            apiResponseQueue.async {
+                                self.processRequestResponse(urlRequest: request, data: data, response: response, error: error, completion: completion)
+                                cleanupRequest()
+                            }
+                        }
+                    }
+                } else {
+                    apiResponseQueue.async {
+                        self.processRequestResponse(urlRequest: request, data: data, response: response, error: error, completion: completion)
+                        cleanupRequest()
+                    }
+                }
+            }
+
+            if #available(iOS 11.0, macOS 10.13, macCatalyst 13.0, tvOS 11.0, watchOS 4.0, *) {
+                onProgressReady?(dataTask.progress)
+            }
+
+            taskIdentifier = dataTask.taskIdentifier
+            challengeHandlerStore[dataTask.taskIdentifier] = taskDidReceiveChallenge
+            credentialStore[dataTask.taskIdentifier] = credential
+
+            dataTask.resume()
+
+            requestTask.set(task: dataTask)
+        } catch {
+            apiResponseQueue.async {
+                completion(.failure(ErrorResponse.error(415, nil, nil, error)))
+            }
+        }
+
+        return requestTask
+    }
+
+    fileprivate func processRequestResponse(urlRequest: URLRequest, data: Data?, response: URLResponse?, error: Error?, completion: @escaping (_ result: Swift.Result<Response<T>, ErrorResponse>) -> Void) {
+
+        if let error = error {
+            completion(.failure(ErrorResponse.error(-1, data, response, error)))
+            return
+        }
+
+        guard let httpResponse = response as? HTTPURLResponse else {
+            completion(.failure(ErrorResponse.error(-2, data, response, DecodableRequestBuilderError.nilHTTPResponse)))
+            return
+        }
+
+        guard httpResponse.isStatusCodeSuccessful else {
+            completion(.failure(ErrorResponse.error(httpResponse.statusCode, data, response, DecodableRequestBuilderError.unsuccessfulHTTPStatusCode)))
+            return
+        }
+
+        switch T.self {
+        case is Void.Type:
+
+            completion(.success(Response(response: httpResponse, body: () as! T, bodyData: data)))
+
+        default:
+            fatalError("Unsupported Response Body Type - \(String(describing: T.self))")
+        }
+
+    }
+
+    open func buildHeaders() -> [String: String] {
+        var httpHeaders: [String: String] = [:]
+        for (key, value) in headers {
+            httpHeaders[key] = value
+        }
+        for (key, value) in PetstoreClientAPI.customHeaders {
+            httpHeaders[key] = value
+        }
+        return httpHeaders
+    }
+
+    fileprivate func getFileName(fromContentDisposition contentDisposition: String?) -> String? {
+
+        guard let contentDisposition = contentDisposition else {
+            return nil
+        }
+
+        let items = contentDisposition.components(separatedBy: ";")
+
+        var filename: String?
+
+        for contentItem in items {
+
+            let filenameKey = "filename="
+            guard let range = contentItem.range(of: filenameKey) else {
+                continue
+            }
+
+            filename = contentItem
+            return filename?
+                .replacingCharacters(in: range, with: "")
+                .replacingOccurrences(of: "\"", with: "")
+                .trimmingCharacters(in: .whitespacesAndNewlines)
+        }
+
+        return filename
+
+    }
+
+    fileprivate func getPath(from url: URL) throws -> String {
+
+        guard var path = URLComponents(url: url, resolvingAgainstBaseURL: true)?.path else {
+            throw DownloadException.requestMissingPath
+        }
+
+        if path.hasPrefix("/") {
+            path.remove(at: path.startIndex)
+        }
+
+        return path
+
+    }
+
+    fileprivate func getURL(from urlRequest: URLRequest) throws -> URL {
+
+        guard let url = urlRequest.url else {
+            throw DownloadException.requestMissingURL
+        }
+
+        return url
+    }
+
+}
+
+open class URLSessionDecodableRequestBuilder<T: Decodable>: URLSessionRequestBuilder<T> {
+    override fileprivate func processRequestResponse(urlRequest: URLRequest, data: Data?, response: URLResponse?, error: Error?, completion: @escaping (_ result: Swift.Result<Response<T>, ErrorResponse>) -> Void) {
+
+        if let error = error {
+            completion(.failure(ErrorResponse.error(-1, data, response, error)))
+            return
+        }
+
+        guard let httpResponse = response as? HTTPURLResponse else {
+            completion(.failure(ErrorResponse.error(-2, data, response, DecodableRequestBuilderError.nilHTTPResponse)))
+            return
+        }
+
+        guard httpResponse.isStatusCodeSuccessful else {
+            completion(.failure(ErrorResponse.error(httpResponse.statusCode, data, response, DecodableRequestBuilderError.unsuccessfulHTTPStatusCode)))
+            return
+        }
+
+        switch T.self {
+        case is String.Type:
+
+            let body = data.flatMap { String(data: $0, encoding: .utf8) } ?? ""
+
+            completion(.success(Response<T>(response: httpResponse, body: body as! T, bodyData: data)))
+
+        case is URL.Type:
+            do {
+
+                guard error == nil else {
+                    throw DownloadException.responseFailed
+                }
+
+                guard let data = data else {
+                    throw DownloadException.responseDataMissing
+                }
+
+                let fileManager = FileManager.default
+                let cachesDirectory = fileManager.urls(for: .cachesDirectory, in: .userDomainMask)[0]
+                let requestURL = try getURL(from: urlRequest)
+
+                var requestPath = try getPath(from: requestURL)
+
+                if let headerFileName = getFileName(fromContentDisposition: httpResponse.allHeaderFields["Content-Disposition"] as? String) {
+                    requestPath = requestPath.appending("/\(headerFileName)")
+                } else {
+                    requestPath = requestPath.appending("/tmp.PetstoreClient.\(UUID().uuidString)")
+                }
+
+                let filePath = cachesDirectory.appendingPathComponent(requestPath)
+                let directoryPath = filePath.deletingLastPathComponent().path
+
+                try fileManager.createDirectory(atPath: directoryPath, withIntermediateDirectories: true, attributes: nil)
+                try data.write(to: filePath, options: .atomic)
+
+                completion(.success(Response(response: httpResponse, body: filePath as! T, bodyData: data)))
+
+            } catch let requestParserError as DownloadException {
+                completion(.failure(ErrorResponse.error(400, data, response, requestParserError)))
+            } catch {
+                completion(.failure(ErrorResponse.error(400, data, response, error)))
+            }
+
+        case is Void.Type:
+
+            completion(.success(Response(response: httpResponse, body: () as! T, bodyData: data)))
+
+        case is Data.Type:
+
+            completion(.success(Response(response: httpResponse, body: data as! T, bodyData: data)))
+
+        default:
+
+            guard let unwrappedData = data, !unwrappedData.isEmpty else {
+                if let E = T.self as? ExpressibleByNilLiteral.Type {
+                    completion(.success(Response(response: httpResponse, body: E.init(nilLiteral: ()) as! T, bodyData: data)))
+                } else {
+                    completion(.failure(ErrorResponse.error(httpResponse.statusCode, nil, response, DecodableRequestBuilderError.emptyDataResponse)))
+                }
+                return
+            }
+
+            let decodeResult = CodableHelper.decode(T.self, from: unwrappedData)
+
+            switch decodeResult {
+            case let .success(decodableObj):
+                completion(.success(Response(response: httpResponse, body: decodableObj, bodyData: unwrappedData)))
+            case let .failure(error):
+                completion(.failure(ErrorResponse.error(httpResponse.statusCode, unwrappedData, response, error)))
+            }
+        }
+    }
+}
+
+private class SessionDelegate: NSObject, URLSessionTaskDelegate {
+    func urlSession(_ session: URLSession, task: URLSessionTask, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
+
+        var disposition: URLSession.AuthChallengeDisposition = .performDefaultHandling
+
+        var credential: URLCredential?
+
+        if let taskDidReceiveChallenge = challengeHandlerStore[task.taskIdentifier] {
+            (disposition, credential) = taskDidReceiveChallenge(session, task, challenge)
+        } else {
+            if challenge.previousFailureCount > 0 {
+                disposition = .rejectProtectionSpace
+            } else {
+                credential = credentialStore[task.taskIdentifier] ?? session.configuration.urlCredentialStorage?.defaultCredential(for: challenge.protectionSpace)
+
+                if credential != nil {
+                    disposition = .useCredential
+                }
+            }
+        }
+
+        completionHandler(disposition, credential)
+    }
+}
+
+public enum HTTPMethod: String {
+    case options = "OPTIONS"
+    case get = "GET"
+    case head = "HEAD"
+    case post = "POST"
+    case put = "PUT"
+    case patch = "PATCH"
+    case delete = "DELETE"
+    case trace = "TRACE"
+    case connect = "CONNECT"
+}
+
+public protocol ParameterEncoding {
+    func encode(_ urlRequest: URLRequest, with parameters: [String: Any]?) throws -> URLRequest
+}
+
+private class URLEncoding: ParameterEncoding {
+    func encode(_ urlRequest: URLRequest, with parameters: [String: Any]?) throws -> URLRequest {
+
+        var urlRequest = urlRequest
+
+        guard let parameters = parameters else { return urlRequest }
+
+        guard let url = urlRequest.url else {
+            throw DownloadException.requestMissingURL
+        }
+
+        if var urlComponents = URLComponents(url: url, resolvingAgainstBaseURL: false), !parameters.isEmpty {
+            urlComponents.queryItems = APIHelper.mapValuesToQueryItems(parameters)
+            urlRequest.url = urlComponents.url
+        }
+
+        return urlRequest
+    }
+}
+
+private class FormDataEncoding: ParameterEncoding {
+
+    let contentTypeForFormPart: (_ fileURL: URL) -> String?
+
+    init(contentTypeForFormPart: @escaping (_ fileURL: URL) -> String?) {
+        self.contentTypeForFormPart = contentTypeForFormPart
+    }
+
+    func encode(_ urlRequest: URLRequest, with parameters: [String: Any]?) throws -> URLRequest {
+
+        var urlRequest = urlRequest
+
+        guard let parameters = parameters, !parameters.isEmpty else {
+            return urlRequest
+        }
+
+        let boundary = "Boundary-\(UUID().uuidString)"
+
+        urlRequest.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
+
+        for (key, value) in parameters {
+            for value in (value as? Array ?? [value]) {
+                switch value {
+                case let fileURL as URL:
+
+                    urlRequest = try configureFileUploadRequest(
+                        urlRequest: urlRequest,
+                        boundary: boundary,
+                        name: key,
+                        fileURL: fileURL
+                    )
+
+                case let string as String:
+
+                    if let data = string.data(using: .utf8) {
+                        urlRequest = configureDataUploadRequest(
+                            urlRequest: urlRequest,
+                            boundary: boundary,
+                            name: key,
+                            data: data
+                        )
+                    }
+
+                case let number as NSNumber:
+
+                    if let data = number.stringValue.data(using: .utf8) {
+                        urlRequest = configureDataUploadRequest(
+                            urlRequest: urlRequest,
+                            boundary: boundary,
+                            name: key,
+                            data: data
+                        )
+                    }
+
+                case let data as Data:
+
+                    urlRequest = configureDataUploadRequest(
+                        urlRequest: urlRequest,
+                        boundary: boundary,
+                        name: key,
+                        data: data
+                    )
+
+                case let uuid as UUID:
+
+                    if let data = uuid.uuidString.data(using: .utf8) {
+                        urlRequest = configureDataUploadRequest(
+                            urlRequest: urlRequest,
+                            boundary: boundary,
+                            name: key,
+                            data: data
+                        )
+                    }
+
+                default:
+                    fatalError("Unprocessable value \(value) with key \(key)")
+                }
+            }
+        }
+
+        var body = urlRequest.httpBody.orEmpty
+
+        body.append("\r\n--\(boundary)--\r\n")
+
+        urlRequest.httpBody = body
+
+        return urlRequest
+    }
+
+    private func configureFileUploadRequest(urlRequest: URLRequest, boundary: String, name: String, fileURL: URL) throws -> URLRequest {
+
+        var urlRequest = urlRequest
+
+        var body = urlRequest.httpBody.orEmpty
+
+        let fileData = try Data(contentsOf: fileURL)
+
+        let mimetype = contentTypeForFormPart(fileURL) ?? mimeType(for: fileURL)
+
+        let fileName = fileURL.lastPathComponent
+
+        // If we already added something then we need an additional newline.
+        if body.count > 0 {
+            body.append("\r\n")
+        }
+
+        // Value boundary.
+        body.append("--\(boundary)\r\n")
+
+        // Value headers.
+        body.append("Content-Disposition: form-data; name=\"\(name)\"; filename=\"\(fileName)\"\r\n")
+        body.append("Content-Type: \(mimetype)\r\n")
+
+        // Separate headers and body.
+        body.append("\r\n")
+
+        // The value data.
+        body.append(fileData)
+
+        urlRequest.httpBody = body
+
+        return urlRequest
+    }
+
+    private func configureDataUploadRequest(urlRequest: URLRequest, boundary: String, name: String, data: Data) -> URLRequest {
+
+        var urlRequest = urlRequest
+
+        var body = urlRequest.httpBody.orEmpty
+
+        // If we already added something then we need an additional newline.
+        if body.count > 0 {
+            body.append("\r\n")
+        }
+
+        // Value boundary.
+        body.append("--\(boundary)\r\n")
+
+        // Value headers.
+        body.append("Content-Disposition: form-data; name=\"\(name)\"\r\n")
+
+        // Separate headers and body.
+        body.append("\r\n")
+
+        // The value data.
+        body.append(data)
+
+        urlRequest.httpBody = body
+
+        return urlRequest
+
+    }
+
+    func mimeType(for url: URL) -> String {
+        let pathExtension = url.pathExtension
+
+        if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension as NSString, nil)?.takeRetainedValue() {
+            if let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
+                return mimetype as String
+            }
+        }
+        return "application/octet-stream"
+    }
+
+}
+
+private class FormURLEncoding: ParameterEncoding {
+    func encode(_ urlRequest: URLRequest, with parameters: [String: Any]?) throws -> URLRequest {
+
+        var urlRequest = urlRequest
+
+        var requestBodyComponents = URLComponents()
+        requestBodyComponents.queryItems = APIHelper.mapValuesToQueryItems(parameters ?? [:])
+
+        if urlRequest.value(forHTTPHeaderField: "Content-Type") == nil {
+            urlRequest.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
+        }
+
+        urlRequest.httpBody = requestBodyComponents.query?.data(using: .utf8)
+
+        return urlRequest
+    }
+}
+
+private extension Data {
+    /// Append string to Data
+    ///
+    /// Rather than littering my code with calls to `dataUsingEncoding` to convert strings to Data, and then add that data to the Data, this wraps it in a nice convenient little extension to Data. This converts using UTF-8.
+    ///
+    /// - parameter string:       The string to be added to the `Data`.
+
+    mutating func append(_ string: String) {
+        if let data = string.data(using: .utf8) {
+            append(data)
+        }
+    }
+}
+
+private extension Optional where Wrapped == Data {
+    var orEmpty: Data {
+        self ?? Data()
+    }
+}
+
+extension JSONDataEncoding: ParameterEncoding {}
diff --git a/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/Validation.swift b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/Validation.swift
new file mode 100644
index 00000000000..df99b3e124b
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/PetstoreClient/Classes/OpenAPIs/Validation.swift
@@ -0,0 +1,126 @@
+// Validation.swift
+//
+// Generated by openapi-generator
+// https://openapi-generator.tech
+//
+
+import Foundation
+
+public struct StringRule {
+    public var minLength: Int?
+    public var maxLength: Int?
+    public var pattern: String?
+}
+
+public struct NumericRule<T: Comparable & Numeric> {
+    public var minimum: T?
+    public var exclusiveMinimum = false
+    public var maximum: T?
+    public var exclusiveMaximum = false
+    public var multipleOf: T?
+}
+
+public enum StringValidationErrorKind: Error {
+    case minLength, maxLength, pattern
+}
+
+public enum NumericValidationErrorKind: Error {
+    case minimum, maximum, multipleOf
+}
+
+public struct ValidationError<T: Error & Hashable>: Error {
+    public fileprivate(set) var kinds: Set<T>
+}
+
+public struct Validator {
+    /// Validate a string against a rule.
+    /// - Parameter string: The String you wish to validate.
+    /// - Parameter rule: The StringRule you wish to use for validation.
+    /// - Returns: A validated string.
+    /// - Throws: `ValidationError<StringValidationErrorKind>` if the string is invalid against the rule,
+    ///           `NSError` if the rule.pattern is invalid.
+    public static func validate(_ string: String, against rule: StringRule) throws -> String {
+        var error = ValidationError<StringValidationErrorKind>(kinds: [])
+        if let minLength = rule.minLength, !(minLength <= string.count) {
+            error.kinds.insert(.minLength)
+        }
+        if let maxLength = rule.maxLength, !(string.count <= maxLength) {
+            error.kinds.insert(.maxLength)
+        }
+        if let pattern = rule.pattern {
+            let matches = try NSRegularExpression(pattern: pattern, options: .caseInsensitive)
+                .matches(in: string, range: .init(location: 0, length: string.utf16.count))
+            if matches.isEmpty {
+                error.kinds.insert(.pattern)
+            }
+        }
+        guard error.kinds.isEmpty else {
+            throw error
+        }
+        return string
+    }
+
+    /// Validate a integer against a rule.
+    /// - Parameter numeric: The integer you wish to validate.
+    /// - Parameter rule: The NumericRule you wish to use for validation.
+    /// - Returns: A validated integer.
+    /// - Throws: `ValidationError<NumericValidationErrorKind>` if the numeric is invalid against the rule.
+    public static func validate<T: Comparable & BinaryInteger>(_ numeric: T, against rule: NumericRule<T>) throws -> T {
+        var error = ValidationError<NumericValidationErrorKind>(kinds: [])
+        if let minium = rule.minimum {
+            if !rule.exclusiveMinimum, !(minium <= numeric) {
+                error.kinds.insert(.minimum)
+            }
+            if rule.exclusiveMinimum, !(minium < numeric) {
+                error.kinds.insert(.minimum)
+            }
+        }
+        if let maximum = rule.maximum {
+            if !rule.exclusiveMaximum, !(numeric <= maximum) {
+                error.kinds.insert(.maximum)
+            }
+            if rule.exclusiveMaximum, !(numeric < maximum) {
+                error.kinds.insert(.maximum)
+            }
+        }
+        if let multipleOf = rule.multipleOf, !numeric.isMultiple(of: multipleOf) {
+            error.kinds.insert(.multipleOf)
+        }
+        guard error.kinds.isEmpty else {
+            throw error
+        }
+        return numeric
+    }
+
+    /// Validate a fractional number against a rule.
+    /// - Parameter numeric: The fractional number you wish to validate.
+    /// - Parameter rule: The NumericRule you wish to use for validation.
+    /// - Returns: A validated fractional number.
+    /// - Throws: `ValidationError<NumericValidationErrorKind>` if the numeric is invalid against the rule.
+    public static func validate<T: Comparable & FloatingPoint>(_ numeric: T, against rule: NumericRule<T>) throws -> T {
+        var error = ValidationError<NumericValidationErrorKind>(kinds: [])
+        if let minium = rule.minimum {
+            if !rule.exclusiveMinimum, !(minium <= numeric) {
+                error.kinds.insert(.minimum)
+            }
+            if rule.exclusiveMinimum, !(minium < numeric) {
+                error.kinds.insert(.minimum)
+            }
+        }
+        if let maximum = rule.maximum {
+            if !rule.exclusiveMaximum, !(numeric <= maximum) {
+                error.kinds.insert(.maximum)
+            }
+            if rule.exclusiveMaximum, !(numeric < maximum) {
+                error.kinds.insert(.maximum)
+            }
+        }
+        if let multipleOf = rule.multipleOf, numeric.remainder(dividingBy: multipleOf) != 0 {
+            error.kinds.insert(.multipleOf)
+        }
+        guard error.kinds.isEmpty else {
+            throw error
+        }
+        return numeric
+    }
+}
diff --git a/samples/client/petstore/swift5/anycodable/README.md b/samples/client/petstore/swift5/anycodable/README.md
new file mode 100644
index 00000000000..f98ca53800a
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/README.md
@@ -0,0 +1,45 @@
+# Swift5 API client for PetstoreClient
+
+No description provided (generated by Openapi Generator https://github.com/openapitools/openapi-generator)
+
+## Overview
+This API client was generated by the [OpenAPI Generator](https://openapi-generator.tech) project.  By using the [openapi-spec](https://github.com/OAI/OpenAPI-Specification) from a remote server, you can easily generate an API client.
+
+- API version: 1.0.0
+- Package version: 
+- Build package: org.openapitools.codegen.languages.Swift5ClientCodegen
+
+## Installation
+
+### Carthage
+
+Run `carthage update`
+
+### CocoaPods
+
+Run `pod install`
+
+## Documentation for API Endpoints
+
+All URIs are relative to *http://localhost*
+
+Class | Method | HTTP request | Description
+------------ | ------------- | ------------- | -------------
+*PetsAPI* | [**petsGet**](docs/PetsAPI.md#petsget) | **GET** /pets | 
+*PetsAPI* | [**showPetById**](docs/PetsAPI.md#showpetbyid) | **GET** /pets/{petId} | Info for a specific pet
+
+
+## Documentation For Models
+
+ - [PrefixPetSuffix](docs/PrefixPetSuffix.md)
+
+
+## Documentation For Authorization
+
+ All endpoints do not require authorization.
+
+
+## Author
+
+
+
diff --git a/samples/client/petstore/swift5/anycodable/docs/PetsAPI.md b/samples/client/petstore/swift5/anycodable/docs/PetsAPI.md
new file mode 100644
index 00000000000..9dfc4bc6c7e
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/docs/PetsAPI.md
@@ -0,0 +1,101 @@
+# PetsAPI
+
+All URIs are relative to *http://localhost*
+
+Method | HTTP request | Description
+------------- | ------------- | -------------
+[**petsGet**](PetsAPI.md#petsget) | **GET** /pets | 
+[**showPetById**](PetsAPI.md#showpetbyid) | **GET** /pets/{petId} | Info for a specific pet
+
+
+# **petsGet**
+```swift
+    open class func petsGet(completion: @escaping (_ data: PrefixPetSuffix?, _ error: Error?) -> Void)
+```
+
+
+
+### Example
+```swift
+// The following code samples are still beta. For any issue, please report via http://github.com/OpenAPITools/openapi-generator/issues/new
+import PetstoreClient
+
+
+PetsAPI.petsGet() { (response, error) in
+    guard error == nil else {
+        print(error)
+        return
+    }
+
+    if (response) {
+        dump(response)
+    }
+}
+```
+
+### Parameters
+This endpoint does not need any parameter.
+
+### Return type
+
+[**PrefixPetSuffix**](PrefixPetSuffix.md)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: Not defined
+ - **Accept**: application/json
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+# **showPetById**
+```swift
+    open class func showPetById(petId: String, completion: @escaping (_ data: AnyCodable?, _ error: Error?) -> Void)
+```
+
+Info for a specific pet
+
+### Example
+```swift
+// The following code samples are still beta. For any issue, please report via http://github.com/OpenAPITools/openapi-generator/issues/new
+import PetstoreClient
+
+let petId = "petId_example" // String | The id of the pet to retrieve
+
+// Info for a specific pet
+PetsAPI.showPetById(petId: petId) { (response, error) in
+    guard error == nil else {
+        print(error)
+        return
+    }
+
+    if (response) {
+        dump(response)
+    }
+}
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **petId** | **String** | The id of the pet to retrieve | 
+
+### Return type
+
+**AnyCodable**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: Not defined
+ - **Accept**: application/json
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
diff --git a/samples/client/petstore/swift5/anycodable/docs/PrefixPetSuffix.md b/samples/client/petstore/swift5/anycodable/docs/PrefixPetSuffix.md
new file mode 100644
index 00000000000..62e3869100b
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/docs/PrefixPetSuffix.md
@@ -0,0 +1,10 @@
+# PrefixPetSuffix
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**testProperty** | **String** |  | 
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+
diff --git a/samples/client/petstore/swift5/anycodable/git_push.sh b/samples/client/petstore/swift5/anycodable/git_push.sh
new file mode 100644
index 00000000000..f53a75d4fab
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/git_push.sh
@@ -0,0 +1,57 @@
+#!/bin/sh
+# ref: https://help.github.com/articles/adding-an-existing-project-to-github-using-the-command-line/
+#
+# Usage example: /bin/sh ./git_push.sh wing328 openapi-petstore-perl "minor update" "gitlab.com"
+
+git_user_id=$1
+git_repo_id=$2
+release_note=$3
+git_host=$4
+
+if [ "$git_host" = "" ]; then
+    git_host="github.com"
+    echo "[INFO] No command line input provided. Set \$git_host to $git_host"
+fi
+
+if [ "$git_user_id" = "" ]; then
+    git_user_id="GIT_USER_ID"
+    echo "[INFO] No command line input provided. Set \$git_user_id to $git_user_id"
+fi
+
+if [ "$git_repo_id" = "" ]; then
+    git_repo_id="GIT_REPO_ID"
+    echo "[INFO] No command line input provided. Set \$git_repo_id to $git_repo_id"
+fi
+
+if [ "$release_note" = "" ]; then
+    release_note="Minor update"
+    echo "[INFO] No command line input provided. Set \$release_note to $release_note"
+fi
+
+# Initialize the local directory as a Git repository
+git init
+
+# Adds the files in the local repository and stages them for commit.
+git add .
+
+# Commits the tracked changes and prepares them to be pushed to a remote repository.
+git commit -m "$release_note"
+
+# Sets the new remote
+git_remote=$(git remote)
+if [ "$git_remote" = "" ]; then # git remote not defined
+
+    if [ "$GIT_TOKEN" = "" ]; then
+        echo "[INFO] \$GIT_TOKEN (environment variable) is not set. Using the git credential in your environment."
+        git remote add origin https://${git_host}/${git_user_id}/${git_repo_id}.git
+    else
+        git remote add origin https://${git_user_id}:"${GIT_TOKEN}"@${git_host}/${git_user_id}/${git_repo_id}.git
+    fi
+
+fi
+
+git pull origin master
+
+# Pushes (Forces) the changes in the local repository up to the remote repository
+echo "Git pushing to https://${git_host}/${git_user_id}/${git_repo_id}.git"
+git push origin master 2>&1 | grep -v 'To https'
diff --git a/samples/client/petstore/swift5/anycodable/pom.xml b/samples/client/petstore/swift5/anycodable/pom.xml
new file mode 100644
index 00000000000..c1b201eb3b4
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/pom.xml
@@ -0,0 +1,43 @@
+<project>
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>io.swagger</groupId>
+    <artifactId>Swift5PetstoreClientTests</artifactId>
+    <packaging>pom</packaging>
+    <version>1.0-SNAPSHOT</version>
+    <name>Swift5 Swagger Petstore Client</name>
+    <build>
+        <plugins>
+            <plugin>
+                <artifactId>maven-dependency-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>copy-dependencies</goal>
+                        </goals>
+                        <configuration>
+                            <outputDirectory>${project.build.directory}</outputDirectory>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <version>1.2.1</version>
+                <executions>
+                    <execution>
+                        <id>xcodebuild-test</id>
+                        <phase>integration-test</phase>
+                        <goals>
+                            <goal>exec</goal>
+                        </goals>
+                        <configuration>
+                            <executable>./run_spmbuild.sh</executable>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/samples/client/petstore/swift5/anycodable/project.yml b/samples/client/petstore/swift5/anycodable/project.yml
new file mode 100644
index 00000000000..0493cf65896
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/project.yml
@@ -0,0 +1,15 @@
+name: PetstoreClient
+targets:
+  PetstoreClient:
+    type: framework
+    platform: iOS
+    deploymentTarget: "9.0"
+    sources: [PetstoreClient]
+    info:
+      path: ./Info.plist
+      version: 1.0.0
+    settings:
+      APPLICATION_EXTENSION_API_ONLY: true
+    scheme: {}
+    dependencies:
+    - carthage: AnyCodable
diff --git a/samples/client/petstore/swift5/anycodable/run_spmbuild.sh b/samples/client/petstore/swift5/anycodable/run_spmbuild.sh
new file mode 100755
index 00000000000..1a9f585ad05
--- /dev/null
+++ b/samples/client/petstore/swift5/anycodable/run_spmbuild.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+swift build && exit ${PIPESTATUS[0]}
diff --git a/samples/client/petstore/swift5/default/docs/AdditionalPropertiesClass.md b/samples/client/petstore/swift5/default/docs/AdditionalPropertiesClass.md
index 1cffcdd8484..4d5f0963145 100644
--- a/samples/client/petstore/swift5/default/docs/AdditionalPropertiesClass.md
+++ b/samples/client/petstore/swift5/default/docs/AdditionalPropertiesClass.md
@@ -11,9 +11,9 @@ Name | Type | Description | Notes
 **mapArrayAnytype** | [String: [AnyCodable]] |  | [optional] 
 **mapMapString** | [String: [String: String]] |  | [optional] 
 **mapMapAnytype** | [String: [String: AnyCodable]] |  | [optional] 
-**anytype1** | [**AnyCodable**](.md) |  | [optional] 
-**anytype2** | [**AnyCodable**](.md) |  | [optional] 
-**anytype3** | [**AnyCodable**](.md) |  | [optional] 
+**anytype1** | **AnyCodable** |  | [optional] 
+**anytype2** | **AnyCodable** |  | [optional] 
+**anytype3** | **AnyCodable** |  | [optional] 
 
 [[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
 
diff --git a/samples/client/petstore/swift5/swift5_test_all.sh b/samples/client/petstore/swift5/swift5_test_all.sh
index c1d6899114a..902a476ef7d 100755
--- a/samples/client/petstore/swift5/swift5_test_all.sh
+++ b/samples/client/petstore/swift5/swift5_test_all.sh
@@ -14,6 +14,7 @@ mvn -f $DIRECTORY/urlsessionLibrary/SwaggerClientTests/pom.xml integration-test
 
 # spm build
 mvn -f $DIRECTORY/alamofireLibrary/pom.xml integration-test
+mvn -f $DIRECTORY/anycodable/pom.xml integration-test
 mvn -f $DIRECTORY/asyncAwaitLibrary/pom.xml integration-test
 mvn -f $DIRECTORY/combineLibrary/pom.xml integration-test
 mvn -f $DIRECTORY/default/pom.xml integration-test
diff --git a/samples/client/petstore/swift5/vaporLibrary/docs/AdditionalPropertiesClass.md b/samples/client/petstore/swift5/vaporLibrary/docs/AdditionalPropertiesClass.md
index 1cffcdd8484..4d5f0963145 100644
--- a/samples/client/petstore/swift5/vaporLibrary/docs/AdditionalPropertiesClass.md
+++ b/samples/client/petstore/swift5/vaporLibrary/docs/AdditionalPropertiesClass.md
@@ -11,9 +11,9 @@ Name | Type | Description | Notes
 **mapArrayAnytype** | [String: [AnyCodable]] |  | [optional] 
 **mapMapString** | [String: [String: String]] |  | [optional] 
 **mapMapAnytype** | [String: [String: AnyCodable]] |  | [optional] 
-**anytype1** | [**AnyCodable**](.md) |  | [optional] 
-**anytype2** | [**AnyCodable**](.md) |  | [optional] 
-**anytype3** | [**AnyCodable**](.md) |  | [optional] 
+**anytype1** | **AnyCodable** |  | [optional] 
+**anytype2** | **AnyCodable** |  | [optional] 
+**anytype3** | **AnyCodable** |  | [optional] 
 
 [[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)