diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ElixirClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ElixirClientCodegen.java
index 775afb9bd59..095d6ac7e18 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ElixirClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ElixirClientCodegen.java
@@ -48,7 +48,7 @@ import static org.openapitools.codegen.utils.StringUtils.underscore;
 public class ElixirClientCodegen extends DefaultCodegen {
     private final Logger LOGGER = LoggerFactory.getLogger(ElixirClientCodegen.class);
 
-    private final Pattern simpleAtomPattern = Pattern.compile("\\A(?:(?:[_@\\p{Alpha}][_@\\p{Alnum}]*[?!]?)|-)\\z");
+    private final Pattern simpleAtomPattern = Pattern.compile("\\A(?:(?:[_\\p{Alpha}][_@\\p{Alnum}]*[?!]?)|-|@)\\z");
 
     @Setter protected String packageVersion = "1.0.0";
     @Setter protected String moduleName;
diff --git a/modules/openapi-generator/src/test/resources/3_0/elixir/petstore-with-fake-endpoints-models-for-testing.yaml b/modules/openapi-generator/src/test/resources/3_0/elixir/petstore-with-fake-endpoints-models-for-testing.yaml
index e4957b4e19d..229450a390d 100644
--- a/modules/openapi-generator/src/test/resources/3_0/elixir/petstore-with-fake-endpoints-models-for-testing.yaml
+++ b/modules/openapi-generator/src/test/resources/3_0/elixir/petstore-with-fake-endpoints-models-for-testing.yaml
@@ -8,7 +8,7 @@ info:
   title: OpenAPI Petstore
   license:
     name: Apache-2.0
-    url: 'https://www.apache.org/licenses/LICENSE-2.0.html'
+    url: "https://www.apache.org/licenses/LICENSE-2.0.html"
 tags:
   - name: pet
     description: Everything about your Pets
@@ -28,65 +28,65 @@ paths:
                 type: object
                 properties:
                   string:
-                    $ref: '#/components/schemas/Foo'
+                    $ref: "#/components/schemas/Foo"
   /pet:
     servers:
-    - url: 'http://petstore.swagger.io/v2'
-    - url: 'http://path-server-test.petstore.local/v2'
-    - url: 'http://{server}.swagger.io:{port}/v2'
-      description: test server with variables
-      variables:
-        server:
-          description: target server
-          enum:
-            - 'petstore'
-            - 'qa-petstore'
-            - 'dev-petstore'
-          default: 'petstore'
-        port:
-          enum:
-            - 80
-            - 8080
-          default: 80
+      - url: "http://petstore.swagger.io/v2"
+      - url: "http://path-server-test.petstore.local/v2"
+      - url: "http://{server}.swagger.io:{port}/v2"
+        description: test server with variables
+        variables:
+          server:
+            description: target server
+            enum:
+              - "petstore"
+              - "qa-petstore"
+              - "dev-petstore"
+            default: "petstore"
+          port:
+            enum:
+              - 80
+              - 8080
+            default: 80
     post:
       tags:
         - pet
       summary: Add a new pet to the store
-      description: ''
+      description: ""
       operationId: addPet
       responses:
-        '200':
+        "200":
           description: Successful operation
-        '405':
+        "405":
           description: Invalid input
       security:
         - petstore_auth:
-            - 'write:pets'
-            - 'read:pets'
+            - "write:pets"
+            - "read:pets"
       requestBody:
-        $ref: '#/components/requestBodies/Pet'
+        $ref: "#/components/requestBodies/Pet"
     put:
       tags:
         - pet
       summary: Update an existing pet
-      description: ''
+      description: ""
       operationId: updatePet
       x-webclient-blocking: true
       responses:
-        '200':
+        "200":
           description: Successful operation
-        '400':
+        "400":
           description: Invalid ID supplied
-        '404':
+        "404":
           description: Pet not found
-        '405':
+        "405":
           description: Validation exception
       security:
         - petstore_auth:
-            - 'write:pets'
-            - 'read:pets'
+            - "write:pets"
+            - "read:pets"
       requestBody:
-        $ref: '#/components/requestBodies/Pet'
+        $ref: "#/components/requestBodies/Pet"
   /pet/findByStatus:
     get:
       tags:
@@ -113,25 +113,25 @@ paths:
                 - sold
               default: available
       responses:
-        '200':
+        "200":
           description: successful operation
           content:
             application/xml:
               schema:
                 type: array
                 items:
-                  $ref: '#/components/schemas/Pet'
+                  $ref: "#/components/schemas/Pet"
             application/json:
               schema:
                 type: array
                 items:
-                  $ref: '#/components/schemas/Pet'
-        '400':
+                  $ref: "#/components/schemas/Pet"
+        "400":
           description: Invalid status value
       security:
         - petstore_auth:
-            - 'write:pets'
-            - 'read:pets'
+            - "write:pets"
+            - "read:pets"
   /pet/findByTags:
     get:
       tags:
@@ -155,29 +155,29 @@ paths:
               type: string
             uniqueItems: true
       responses:
-        '200':
+        "200":
           description: successful operation
           content:
             application/xml:
               schema:
                 type: array
                 items:
-                  $ref: '#/components/schemas/Pet'
+                  $ref: "#/components/schemas/Pet"
                 uniqueItems: true
             application/json:
               schema:
                 type: array
                 items:
-                  $ref: '#/components/schemas/Pet'
+                  $ref: "#/components/schemas/Pet"
                 uniqueItems: true
-        '400':
+        "400":
           description: Invalid tag value
       security:
         - petstore_auth:
-            - 'write:pets'
-            - 'read:pets'
+            - "write:pets"
+            - "read:pets"
       deprecated: true
-  '/pet/{petId}':
+  "/pet/{petId}":
     get:
       tags:
         - pet
@@ -194,18 +194,18 @@ paths:
             type: integer
             format: int64
       responses:
-        '200':
+        "200":
           description: successful operation
           content:
             application/xml:
               schema:
-                $ref: '#/components/schemas/Pet'
+                $ref: "#/components/schemas/Pet"
             application/json:
               schema:
-                $ref: '#/components/schemas/Pet'
-        '400':
+                $ref: "#/components/schemas/Pet"
+        "400":
           description: Invalid ID supplied
-        '404':
+        "404":
           description: Pet not found
       security:
         - api_key: []
@@ -213,7 +213,7 @@ paths:
       tags:
         - pet
       summary: Updates a pet in the store with form data
-      description: ''
+      description: ""
       operationId: updatePetWithForm
       parameters:
         - name: petId
@@ -224,14 +224,14 @@ paths:
             type: integer
             format: int64
       responses:
-        '200':
+        "200":
           description: Successful operation
-        '405':
+        "405":
           description: Invalid input
       security:
         - petstore_auth:
-            - 'write:pets'
-            - 'read:pets'
+            - "write:pets"
+            - "read:pets"
       requestBody:
         content:
           application/x-www-form-urlencoded:
@@ -248,7 +248,7 @@ paths:
       tags:
         - pet
       summary: Deletes a pet
-      description: ''
+      description: ""
       operationId: deletePet
       parameters:
         - name: api_key
@@ -264,20 +264,20 @@ paths:
             type: integer
             format: int64
       responses:
-        '200':
+        "200":
           description: Successful operation
-        '400':
+        "400":
           description: Invalid pet value
       security:
         - petstore_auth:
-            - 'write:pets'
-            - 'read:pets'
-  '/pet/{petId}/uploadImage':
+            - "write:pets"
+            - "read:pets"
+  "/pet/{petId}/uploadImage":
     post:
       tags:
         - pet
       summary: uploads an image
-      description: ''
+      description: ""
       operationId: uploadFile
       parameters:
         - name: petId
@@ -288,16 +288,16 @@ paths:
             type: integer
             format: int64
       responses:
-        '200':
+        "200":
           description: successful operation
           content:
             application/json:
               schema:
-                $ref: '#/components/schemas/ApiResponse'
+                $ref: "#/components/schemas/ApiResponse"
       security:
         - petstore_auth:
-            - 'write:pets'
-            - 'read:pets'
+            - "write:pets"
+            - "read:pets"
       requestBody:
         content:
           multipart/form-data:
@@ -320,7 +320,7 @@ paths:
       operationId: getInventory
       x-webclient-blocking: false
       responses:
-        '200':
+        "200":
           description: successful operation
           content:
             application/json:
@@ -336,28 +336,28 @@ paths:
       tags:
         - store
       summary: Place an order for a pet
-      description: ''
+      description: ""
       operationId: placeOrder
       responses:
-        '200':
+        "200":
           description: successful operation
           content:
             application/xml:
               schema:
-                $ref: '#/components/schemas/Order'
+                $ref: "#/components/schemas/Order"
             application/json:
               schema:
-                $ref: '#/components/schemas/Order'
-        '400':
+                $ref: "#/components/schemas/Order"
+        "400":
           description: Invalid Order
       requestBody:
         content:
           application/json:
             schema:
-              $ref: '#/components/schemas/Order'
+              $ref: "#/components/schemas/Order"
         description: order placed for purchasing the pet
         required: true
-  '/store/order/{order_id}':
+  "/store/order/{order_id}":
     get:
       tags:
         - store
@@ -377,18 +377,18 @@ paths:
             minimum: 1
             maximum: 5
       responses:
-        '200':
+        "200":
           description: successful operation
           content:
             application/xml:
               schema:
-                $ref: '#/components/schemas/Order'
+                $ref: "#/components/schemas/Order"
             application/json:
               schema:
-                $ref: '#/components/schemas/Order'
-        '400':
+                $ref: "#/components/schemas/Order"
+        "400":
           description: Invalid ID supplied
-        '404':
+        "404":
           description: Order not found
     delete:
       tags:
@@ -406,9 +406,9 @@ paths:
           schema:
             type: string
       responses:
-        '400':
+        "400":
           description: Invalid ID supplied
-        '404':
+        "404":
           description: Order not found
   /user:
     post:
@@ -424,7 +424,7 @@ paths:
         content:
           application/json:
             schema:
-              $ref: '#/components/schemas/User'
+              $ref: "#/components/schemas/User"
         description: Created user object
         required: true
   /user/createWithArray:
@@ -432,31 +432,31 @@ paths:
       tags:
         - user
       summary: Creates list of users with given input array
-      description: ''
+      description: ""
       operationId: createUsersWithArrayInput
       responses:
         default:
           description: successful operation
       requestBody:
-        $ref: '#/components/requestBodies/UserArray'
+        $ref: "#/components/requestBodies/UserArray"
   /user/createWithList:
     post:
       tags:
         - user
       summary: Creates list of users with given input array
-      description: ''
+      description: ""
       operationId: createUsersWithListInput
       responses:
         default:
           description: successful operation
       requestBody:
-        $ref: '#/components/requestBodies/UserArray'
+        $ref: "#/components/requestBodies/UserArray"
   /user/login:
     get:
       tags:
         - user
       summary: Logs user into the system
-      description: ''
+      description: ""
       operationId: loginUser
       parameters:
         - name: username
@@ -472,7 +472,7 @@ paths:
           schema:
             type: string
       responses:
-        '200':
+        "200":
           description: successful operation
           headers:
             X-Rate-Limit:
@@ -492,24 +492,24 @@ paths:
             application/json:
               schema:
                 type: string
-        '400':
+        "400":
           description: Invalid username/password supplied
   /user/logout:
     get:
       tags:
         - user
       summary: Logs out current logged in user session
-      description: ''
+      description: ""
       operationId: logoutUser
       responses:
         default:
           description: successful operation
-  '/user/{username}':
+  "/user/{username}":
     get:
       tags:
         - user
       summary: Get user by user name
-      description: ''
+      description: ""
       operationId: getUserByName
       parameters:
         - name: username
@@ -519,18 +519,18 @@ paths:
           schema:
             type: string
       responses:
-        '200':
+        "200":
           description: successful operation
           content:
             application/xml:
               schema:
-                $ref: '#/components/schemas/User'
+                $ref: "#/components/schemas/User"
             application/json:
               schema:
-                $ref: '#/components/schemas/User'
-        '400':
+                $ref: "#/components/schemas/User"
+        "400":
           description: Invalid username supplied
-        '404':
+        "404":
           description: User not found
     put:
       tags:
@@ -546,15 +546,15 @@ paths:
           schema:
             type: string
       responses:
-        '400':
+        "400":
           description: Invalid user supplied
-        '404':
+        "404":
           description: User not found
       requestBody:
         content:
           application/json:
             schema:
-              $ref: '#/components/schemas/User'
+              $ref: "#/components/schemas/User"
         description: Updated user object
         required: true
     delete:
@@ -571,28 +571,28 @@ paths:
           schema:
             type: string
       responses:
-        '400':
+        "400":
           description: Invalid username supplied
-        '404':
+        "404":
           description: User not found
   /fake_classname_test:
     patch:
       tags:
-        - 'fake_classname_tags 123#$%^'
+        - "fake_classname_tags 123#$%^"
       summary: To test class name in snake case
       description: To test class name in snake case
       operationId: testClassname
       responses:
-        '200':
+        "200":
           description: successful operation
           content:
             application/json:
               schema:
-                $ref: '#/components/schemas/Client'
+                $ref: "#/components/schemas/Client"
       security:
         - api_key_query: []
       requestBody:
-        $ref: '#/components/requestBodies/Client'
+        $ref: "#/components/requestBodies/Client"
   /fake:
     patch:
       tags:
@@ -601,14 +601,14 @@ paths:
       description: To test "client" model
       operationId: testClientModel
       responses:
-        '200':
+        "200":
           description: successful operation
           content:
             application/json:
               schema:
-                $ref: '#/components/schemas/Client'
+                $ref: "#/components/schemas/Client"
       requestBody:
-        $ref: '#/components/requestBodies/Client'
+        $ref: "#/components/requestBodies/Client"
     get:
       tags:
         - fake
@@ -625,7 +625,7 @@ paths:
               type: string
               default: $
               enum:
-                - '>'
+                - ">"
                 - $
         - name: enum_header_string
           in: header
@@ -634,9 +634,9 @@ paths:
             type: string
             enum:
               - _abc
-              - '-efg'
+              - "-efg"
               - (xyz)
-            default: '-efg'
+            default: "-efg"
         - name: enum_query_string_array
           in: query
           description: Query parameter enum test (string array)
@@ -646,7 +646,7 @@ paths:
               type: string
               default: $
               enum:
-                - '>'
+                - ">"
                 - $
         - name: enum_query_string
           in: query
@@ -655,9 +655,9 @@ paths:
             type: string
             enum:
               - _abc
-              - '-efg'
+              - "-efg"
               - (xyz)
-            default: '-efg'
+            default: "-efg"
         - name: enum_query_integer
           in: query
           description: Query parameter enum test (double)
@@ -681,11 +681,11 @@ paths:
           schema:
             type: array
             items:
-              $ref: '#/components/schemas/EnumClass'
+              $ref: "#/components/schemas/EnumClass"
       responses:
-        '400':
+        "400":
           description: Invalid request
-        '404':
+        "404":
           description: Not found
       requestBody:
         content:
@@ -700,16 +700,16 @@ paths:
                     type: string
                     default: $
                     enum:
-                      - '>'
+                      - ">"
                       - $
                 enum_form_string:
                   description: Form parameter enum test (string)
                   type: string
                   enum:
                     - _abc
-                    - '-efg'
+                    - "-efg"
                     - (xyz)
-                  default: '-efg'
+                  default: "-efg"
     post:
       tags:
         - fake
@@ -725,9 +725,9 @@ paths:
         가짜 엔드 포인트
       operationId: testEndpointParameters
       responses:
-        '400':
+        "400":
           description: Invalid username supplied
-        '404':
+        "404":
           description: User not found
       security:
         - http_basic_test: []
@@ -771,11 +771,11 @@ paths:
                 string:
                   description: None
                   type: string
-                  pattern: '/[a-z]/i'
+                  pattern: "/[a-z]/i"
                 pattern_without_delimiter:
                   description: None
                   type: string
-                  pattern: '^[A-Z].*'
+                  pattern: "^[A-Z].*"
                 byte:
                   description: None
                   type: string
@@ -852,7 +852,7 @@ paths:
             type: integer
             format: int64
       responses:
-        '400':
+        "400":
           description: Something wrong
   /fake/outer/number:
     post:
@@ -861,17 +861,17 @@ paths:
       description: Test serialization of outer number types
       operationId: fakeOuterNumberSerialize
       responses:
-        '200':
+        "200":
           description: Output number
           content:
-            '*/*':
+            "*/*":
               schema:
-                $ref: '#/components/schemas/OuterNumber'
+                $ref: "#/components/schemas/OuterNumber"
       requestBody:
         content:
           application/json:
             schema:
-              $ref: '#/components/schemas/OuterNumber'
+              $ref: "#/components/schemas/OuterNumber"
         description: Input number as post body
   /fake/property/enum-int:
     post:
@@ -880,18 +880,18 @@ paths:
       description: Test serialization of enum (int) properties with examples
       operationId: fakePropertyEnumIntegerSerialize
       responses:
-        '200':
+        "200":
           description: Output enum (int)
           content:
-            '*/*':
+            "*/*":
               schema:
-                $ref: '#/components/schemas/OuterObjectWithEnumProperty'
+                $ref: "#/components/schemas/OuterObjectWithEnumProperty"
       requestBody:
         required: true
         content:
           application/json:
             schema:
-              $ref: '#/components/schemas/OuterObjectWithEnumProperty'
+              $ref: "#/components/schemas/OuterObjectWithEnumProperty"
         description: Input enum (int) as post body
   /fake/outer/string:
     post:
@@ -900,17 +900,17 @@ paths:
       description: Test serialization of outer string types
       operationId: fakeOuterStringSerialize
       responses:
-        '200':
+        "200":
           description: Output string
           content:
-            '*/*':
+            "*/*":
               schema:
-                $ref: '#/components/schemas/OuterString'
+                $ref: "#/components/schemas/OuterString"
       requestBody:
         content:
           application/json:
             schema:
-              $ref: '#/components/schemas/OuterString'
+              $ref: "#/components/schemas/OuterString"
         description: Input string as post body
   /fake/outer/boolean:
     post:
@@ -919,17 +919,17 @@ paths:
       description: Test serialization of outer boolean types
       operationId: fakeOuterBooleanSerialize
       responses:
-        '200':
+        "200":
           description: Output boolean
           content:
-            '*/*':
+            "*/*":
               schema:
-                $ref: '#/components/schemas/OuterBoolean'
+                $ref: "#/components/schemas/OuterBoolean"
       requestBody:
         content:
           application/json:
             schema:
-              $ref: '#/components/schemas/OuterBoolean'
+              $ref: "#/components/schemas/OuterBoolean"
         description: Input boolean as post body
   /fake/outer/composite:
     post:
@@ -938,17 +938,17 @@ paths:
       description: Test serialization of object with outer number type
       operationId: fakeOuterCompositeSerialize
       responses:
-        '200':
+        "200":
           description: Output composite
           content:
-            '*/*':
+            "*/*":
               schema:
-                $ref: '#/components/schemas/OuterComposite'
+                $ref: "#/components/schemas/OuterComposite"
       requestBody:
         content:
           application/json:
             schema:
-              $ref: '#/components/schemas/OuterComposite'
+              $ref: "#/components/schemas/OuterComposite"
         description: Input composite as post body
   /fake/BigDecimalMap:
     get:
@@ -957,10 +957,10 @@ paths:
       description: for Java apache and Java native, test toUrlQueryString for maps with BegDecimal keys
       operationId: fakeBigDecimalMap
       responses:
-        '200':
+        "200":
           description: successful operation
           content:
-            '*/*':
+            "*/*":
               schema:
                 type: object
                 properties:
@@ -975,10 +975,10 @@ paths:
       tags:
         - fake
       summary: test json serialization of form data
-      description: ''
+      description: ""
       operationId: testJsonFormData
       responses:
-        '200':
+        "200":
           description: successful operation
       requestBody:
         content:
@@ -1000,16 +1000,16 @@ paths:
       tags:
         - fake
       summary: test referenced additionalProperties
-      description: ''
+      description: ""
       operationId: testAdditionalPropertiesReference
       responses:
-        '200':
+        "200":
           description: successful operation
       requestBody:
         content:
           application/json:
             schema:
-              $ref: '#/components/schemas/FreeFormObject'
+              $ref: "#/components/schemas/FreeFormObject"
         description: request body
         required: true
   /fake/stringMap-reference:
@@ -1017,16 +1017,16 @@ paths:
       tags:
         - fake
       summary: test referenced string map
-      description: ''
+      description: ""
       operationId: testStringMapReference
       responses:
-        '200':
+        "200":
           description: successful operation
       requestBody:
         content:
           application/json:
             schema:
-              $ref: '#/components/schemas/MapOfString'
+              $ref: "#/components/schemas/MapOfString"
         description: request body
         required: true
   /fake/inline-additionalProperties:
@@ -1034,10 +1034,10 @@ paths:
       tags:
         - fake
       summary: test inline additionalProperties
-      description: ''
+      description: ""
       operationId: testInlineAdditionalProperties
       responses:
-        '200':
+        "200":
           description: successful operation
       requestBody:
         content:
@@ -1053,10 +1053,10 @@ paths:
       tags:
         - fake
       summary: test inline free-form additionalProperties
-      description: ''
+      description: ""
       operationId: testInlineFreeformAdditionalProperties
       responses:
-        '200':
+        "200":
           description: successful operation
       requestBody:
         content:
@@ -1080,7 +1080,7 @@ paths:
         content:
           application/json:
             schema:
-              $ref: '#/components/schemas/ChildWithNullable'
+              $ref: "#/components/schemas/ChildWithNullable"
         description: request body
         required: true
       responses:
@@ -1098,13 +1098,13 @@ paths:
           schema:
             type: string
       responses:
-        '200':
+        "200":
           description: Success
       requestBody:
         content:
           application/json:
             schema:
-              $ref: '#/components/schemas/User'
+              $ref: "#/components/schemas/User"
         required: true
   /another-fake/dummy:
     patch:
@@ -1112,16 +1112,16 @@ paths:
         - $another-fake?
       summary: To test special tags
       description: To test special tags and operation ID starting with number
-      operationId: '123_test_@#$%_special_tags'
+      operationId: "123_test_@#$%_special_tags"
       responses:
-        '200':
+        "200":
           description: successful operation
           content:
             application/json:
               schema:
-                $ref: '#/components/schemas/Client'
+                $ref: "#/components/schemas/Client"
       requestBody:
-        $ref: '#/components/requestBodies/Client'
+        $ref: "#/components/requestBodies/Client"
   /fake/body-with-file-schema:
     put:
       tags:
@@ -1131,13 +1131,13 @@ paths:
         `File`.
       operationId: testBodyWithFileSchema
       responses:
-        '200':
+        "200":
           description: Success
       requestBody:
         content:
           application/json:
             schema:
-              $ref: '#/components/schemas/FileSchemaTestClass'
+              $ref: "#/components/schemas/FileSchemaTestClass"
         required: true
   /fake/body-with-binary:
     put:
@@ -1147,7 +1147,7 @@ paths:
         For this test, the body has to be a binary file.
       operationId: testBodyWithBinary
       responses:
-        '200':
+        "200":
           description: Success
       requestBody:
         content:
@@ -1224,12 +1224,12 @@ paths:
       responses:
         "200":
           description: Success
-  '/fake/{petId}/uploadImageWithRequiredFile':
+  "/fake/{petId}/uploadImageWithRequiredFile":
     post:
       tags:
         - pet
       summary: uploads an image (required)
-      description: ''
+      description: ""
       operationId: uploadFileWithRequiredFile
       parameters:
         - name: petId
@@ -1240,16 +1240,16 @@ paths:
             type: integer
             format: int64
       responses:
-        '200':
+        "200":
           description: successful operation
           content:
             application/json:
               schema:
-                $ref: '#/components/schemas/ApiResponse'
+                $ref: "#/components/schemas/ApiResponse"
       security:
         - petstore_auth:
-            - 'write:pets'
-            - 'read:pets'
+            - "write:pets"
+            - "read:pets"
       requestBody:
         content:
           multipart/form-data:
@@ -1276,7 +1276,7 @@ paths:
           content:
             application/json:
               schema:
-                $ref: '#/components/schemas/HealthCheckResult'
+                $ref: "#/components/schemas/HealthCheckResult"
   /fake/http-signature-test:
     get:
       tags:
@@ -1299,20 +1299,20 @@ paths:
       security:
         - http_signature_test: []
       requestBody:
-        $ref: '#/components/requestBodies/Pet'
+        $ref: "#/components/requestBodies/Pet"
       responses:
         200:
           description: The instance started successfully
 servers:
-  - url: 'http://{server}.swagger.io:{port}/v2'
+  - url: "http://{server}.swagger.io:{port}/v2"
     description: petstore server
     variables:
       server:
         enum:
-          - 'petstore'
-          - 'qa-petstore'
-          - 'dev-petstore'
-        default: 'petstore'
+          - "petstore"
+          - "qa-petstore"
+          - "dev-petstore"
+        default: "petstore"
       port:
         enum:
           - 80
@@ -1323,9 +1323,9 @@ servers:
     variables:
       version:
         enum:
-          - 'v1'
-          - 'v2'
-        default: 'v2'
+          - "v1"
+          - "v2"
+        default: "v2"
   - url: https://127.0.0.1/no_varaible
     description: The local server without variables
 components:
@@ -1336,24 +1336,24 @@ components:
           schema:
             type: array
             items:
-              $ref: '#/components/schemas/User'
+              $ref: "#/components/schemas/User"
       description: List of user object
       required: true
     Client:
       content:
         application/json:
           schema:
-            $ref: '#/components/schemas/Client'
+            $ref: "#/components/schemas/Client"
       description: client model
       required: true
     Pet:
       content:
         application/json:
           schema:
-            $ref: '#/components/schemas/Pet'
+            $ref: "#/components/schemas/Pet"
         application/xml:
           schema:
-            $ref: '#/components/schemas/Pet'
+            $ref: "#/components/schemas/Pet"
       description: Pet object that needs to be added to the store
       required: true
   securitySchemes:
@@ -1361,10 +1361,10 @@ components:
       type: oauth2
       flows:
         implicit:
-          authorizationUrl: 'http://petstore.swagger.io/api/oauth/dialog'
+          authorizationUrl: "http://petstore.swagger.io/api/oauth/dialog"
           scopes:
-            'write:pets': modify pets in your account
-            'read:pets': read your pets
+            "write:pets": modify pets in your account
+            "read:pets": read your pets
     api_key:
       type: apiKey
       name: api_key
@@ -1388,7 +1388,7 @@ components:
       type: object
       properties:
         bar:
-          $ref: '#/components/schemas/Bar'
+          $ref: "#/components/schemas/Bar"
     Bar:
       type: string
       default: bar
@@ -1478,7 +1478,7 @@ components:
           format: int64
           x-is-unique: true
         category:
-          $ref: '#/components/schemas/Category'
+          $ref: "#/components/schemas/Category"
         name:
           type: string
           example: doggie
@@ -1497,7 +1497,7 @@ components:
             name: tag
             wrapped: true
           items:
-            $ref: '#/components/schemas/Tag'
+            $ref: "#/components/schemas/Tag"
         status:
           type: string
           description: pet status in the store
@@ -1561,14 +1561,14 @@ components:
           type: string
     Dog:
       allOf:
-        - $ref: '#/components/schemas/Animal'
+        - $ref: "#/components/schemas/Animal"
         - type: object
           properties:
             breed:
               type: string
     Cat:
       allOf:
-        - $ref: '#/components/schemas/Animal'
+        - $ref: "#/components/schemas/Animal"
         - type: object
           properties:
             declawed:
@@ -1578,8 +1578,8 @@ components:
       discriminator:
         propertyName: className
         mapping:
-          DOG: '#/components/schemas/Dog'
-          CAT: '#/components/schemas/Cat'
+          DOG: "#/components/schemas/Dog"
+          CAT: "#/components/schemas/Cat"
       required:
         - className
       properties:
@@ -1591,7 +1591,7 @@ components:
     AnimalFarm:
       type: array
       items:
-        $ref: '#/components/schemas/Animal'
+        $ref: "#/components/schemas/Animal"
     format_test:
       type: object
       required:
@@ -1631,7 +1631,7 @@ components:
           format: number
         string:
           type: string
-          pattern: '/[a-z]/i'
+          pattern: "/[a-z]/i"
         byte:
           type: string
           format: byte
@@ -1663,10 +1663,10 @@ components:
           pattern: '/^image_\d{1,3}$/i'
     EnumClass:
       type: string
-      default: '-efg'
+      default: "-efg"
       enum:
         - _abc
-        - '-efg'
+        - "-efg"
         - (xyz)
     Enum_Test:
       type: object
@@ -1678,13 +1678,13 @@ components:
           enum:
             - UPPER
             - lower
-            - ''
+            - ""
         enum_string_required:
           type: string
           enum:
             - UPPER
             - lower
-            - ''
+            - ""
         enum_integer:
           type: integer
           format: int32
@@ -1698,13 +1698,13 @@ components:
             - 1.1
             - -1.2
         outerEnum:
-          $ref: '#/components/schemas/OuterEnum'
+          $ref: "#/components/schemas/OuterEnum"
         outerEnumInteger:
-          $ref: '#/components/schemas/OuterEnumInteger'
+          $ref: "#/components/schemas/OuterEnumInteger"
         outerEnumDefaultValue:
-          $ref: '#/components/schemas/OuterEnumDefaultValue'
+          $ref: "#/components/schemas/OuterEnumDefaultValue"
         outerEnumIntegerDefaultValue:
-          $ref: '#/components/schemas/OuterEnumIntegerDefaultValue'
+          $ref: "#/components/schemas/OuterEnumIntegerDefaultValue"
     AdditionalPropertiesClass:
       type: object
       properties:
@@ -1730,7 +1730,7 @@ components:
         map:
           type: object
           additionalProperties:
-            $ref: '#/components/schemas/Animal'
+            $ref: "#/components/schemas/Animal"
     List:
       type: object
       properties:
@@ -1796,7 +1796,7 @@ components:
           additionalProperties:
             type: boolean
         indirect_map:
-          $ref: '#/components/schemas/StringBooleanMap'
+          $ref: "#/components/schemas/StringBooleanMap"
     ArrayTest:
       type: object
       properties:
@@ -1818,7 +1818,7 @@ components:
           items:
             type: array
             items:
-              $ref: '#/components/schemas/ReadOnlyFirst'
+              $ref: "#/components/schemas/ReadOnlyFirst"
     NumberOnly:
       type: object
       properties:
@@ -1846,7 +1846,7 @@ components:
         just_symbol:
           type: string
           enum:
-            - '>='
+            - ">="
             - $
         array_enum:
           type: array
@@ -1874,33 +1874,33 @@ components:
     OuterEnumInteger:
       type: integer
       enum:
-      - 0
-      - 1
-      - 2
+        - 0
+        - 1
+        - 2
       example: 2
     OuterEnumDefaultValue:
       type: string
       enum:
-      - placed
-      - approved
-      - delivered
+        - placed
+        - approved
+        - delivered
       default: placed
     OuterEnumIntegerDefaultValue:
       type: integer
       enum:
-      - 0
-      - 1
-      - 2
+        - 0
+        - 1
+        - 2
       default: 0
     OuterComposite:
       type: object
       properties:
         my_number:
-          $ref: '#/components/schemas/OuterNumber'
+          $ref: "#/components/schemas/OuterNumber"
         my_string:
-          $ref: '#/components/schemas/OuterString'
+          $ref: "#/components/schemas/OuterString"
         my_boolean:
-          $ref: '#/components/schemas/OuterBoolean'
+          $ref: "#/components/schemas/OuterBoolean"
     OuterNumber:
       type: number
     OuterString:
@@ -1922,7 +1922,7 @@ components:
           nullable: true
     ChildWithNullable:
       allOf:
-        - $ref: '#/components/schemas/ParentWithNullable'
+        - $ref: "#/components/schemas/ParentWithNullable"
         - type: object
           properties:
             otherProperty:
@@ -1934,11 +1934,11 @@ components:
       type: object
       properties:
         file:
-          $ref: '#/components/schemas/File'
+          $ref: "#/components/schemas/File"
         files:
           type: array
           items:
-            $ref: '#/components/schemas/File'
+            $ref: "#/components/schemas/File"
     File:
       type: object
       description: Must be named `File` for test.
@@ -1948,11 +1948,11 @@ components:
           type: string
     _special_model.name_:
       properties:
-        '$special[property.name]':
+        "$special[property.name]":
           type: integer
           format: int64
       xml:
-        name: '$special[model.name]'
+        name: "$special[model.name]"
     HealthCheckResult:
       type: object
       properties:
@@ -2026,7 +2026,7 @@ components:
         - value
       properties:
         value:
-          $ref: '#/components/schemas/OuterEnumInteger'
+          $ref: "#/components/schemas/OuterEnumInteger"
     DeprecatedObject:
       type: object
       deprecated: true
@@ -2042,12 +2042,12 @@ components:
           type: number
           deprecated: true
         deprecatedRef:
-          $ref: '#/components/schemas/DeprecatedObject'
+          $ref: "#/components/schemas/DeprecatedObject"
         bars:
           type: array
           deprecated: true
           items:
-            $ref: '#/components/schemas/Bar'
+            $ref: "#/components/schemas/Bar"
     AllOfWithSingleRef:
       type: object
       properties:
@@ -2055,7 +2055,12 @@ components:
           type: string
         SingleRefType:
           allOf:
-            - $ref: '#/components/schemas/SingleRefType'
+            - $ref: "#/components/schemas/SingleRefType"
+    Any:
+      type: object
+      properties:
+        "@type":
+          type: string
     SingleRefType:
       type: string
       title: SingleRefType
diff --git a/samples/client/petstore/elixir/.openapi-generator/FILES b/samples/client/petstore/elixir/.openapi-generator/FILES
index aadc7af9aa6..baf3f42cbc2 100644
--- a/samples/client/petstore/elixir/.openapi-generator/FILES
+++ b/samples/client/petstore/elixir/.openapi-generator/FILES
@@ -17,6 +17,7 @@ lib/openapi_petstore/model/_special_model_name_.ex
 lib/openapi_petstore/model/additional_properties_class.ex
 lib/openapi_petstore/model/all_of_with_single_ref.ex
 lib/openapi_petstore/model/animal.ex
+lib/openapi_petstore/model/any.ex
 lib/openapi_petstore/model/api_response.ex
 lib/openapi_petstore/model/array_of_array_of_number_only.ex
 lib/openapi_petstore/model/array_of_number_only.ex
diff --git a/samples/client/petstore/elixir/lib/openapi_petstore/model/any.ex b/samples/client/petstore/elixir/lib/openapi_petstore/model/any.ex
new file mode 100644
index 00000000000..752351449d9
--- /dev/null
+++ b/samples/client/petstore/elixir/lib/openapi_petstore/model/any.ex
@@ -0,0 +1,22 @@
+# NOTE: This file is auto generated by OpenAPI Generator 7.11.0-SNAPSHOT (https://openapi-generator.tech).
+# Do not edit this file manually.
+
+defmodule OpenapiPetstore.Model.Any do
+  @moduledoc """
+  
+  """
+
+  @derive Jason.Encoder
+  defstruct [
+    :"@type"
+  ]
+
+  @type t :: %__MODULE__{
+    :"@type" => String.t | nil
+  }
+
+  def decode(value) do
+    value
+  end
+end
+
diff --git a/samples/client/petstore/elixir/test/any_test.exs b/samples/client/petstore/elixir/test/any_test.exs
new file mode 100644
index 00000000000..de9b3e095b4
--- /dev/null
+++ b/samples/client/petstore/elixir/test/any_test.exs
@@ -0,0 +1,14 @@
+defmodule AnyTest do
+  use ExUnit.Case, async: true
+  alias OpenapiPetstore.Model.Any, as: Model
+
+  test "decode all properties (not nil)" do
+    assert %Model{
+             "@type": "3fa85f64-5717-4562-b3fc-2c963f66afa6"
+           }
+           |> Model.decode() ==
+             %Model{
+               "@type": "3fa85f64-5717-4562-b3fc-2c963f66afa6"
+             }
+  end
+end