diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/InlineModelResolver.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/InlineModelResolver.java
index 9d632888f20..703c0247491 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/InlineModelResolver.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/InlineModelResolver.java
@@ -621,6 +621,15 @@ public class InlineModelResolver {
         XML xml = object.getXml();
         Map<String, Schema> properties = object.getProperties();
         Schema model = new Schema();
+        if (object.getType() != null) {
+            model.setType(object.getType());
+        }
+        if (object.getFormat() != null) {
+            // Even though the `format` keyword typically applies to primitive types only,
+            // the JSON schema specification states `format` can be used for any model type instance
+            // including object types.
+            model.setFormat(object.getFormat());
+        }
         model.setDescription(description);
         model.setExample(example);
         model.setName(object.getName());
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/InlineModelResolverTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/InlineModelResolverTest.java
index e32a45252ed..974e21d833e 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/InlineModelResolverTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/InlineModelResolverTest.java
@@ -263,6 +263,23 @@ public class InlineModelResolverTest {
         assertTrue(model.getProperties().get("name") instanceof StringSchema);
     }
 
+    @Test
+    public void testInlineResponseModelType() {
+        OpenAPI openAPI = TestUtils.parseSpec("src/test/resources/3_0/6150_model_json_inline.yaml");
+        new InlineModelResolver().flatten(openAPI);
+        
+        Schema InlineResponse200 = openAPI.getComponents().getSchemas().get("inline_response_200");
+        assertEquals("object", InlineResponse200.getType());
+        assertEquals("unknown", InlineResponse200.getFormat());
+        Schema FooBarObject = openAPI.getComponents().getSchemas().get("FooBarObject");
+        assertEquals("object", FooBarObject.getType());
+        assertEquals("date-time", FooBarObject.getFormat());
+        Schema Animal = openAPI.getComponents().getSchemas().get("Animal");
+        assertEquals("object", Animal.getType());
+        Schema Dog = openAPI.getComponents().getSchemas().get("Dog");
+        assertNull(Dog.getType());
+    }
+
     @Test
     public void testInlineResponseModelWithTitle() {
         OpenAPI openapi = new OpenAPI();
diff --git a/modules/openapi-generator/src/test/resources/3_0/6150_model_json_inline.yaml b/modules/openapi-generator/src/test/resources/3_0/6150_model_json_inline.yaml
new file mode 100644
index 00000000000..624a7bff27a
--- /dev/null
+++ b/modules/openapi-generator/src/test/resources/3_0/6150_model_json_inline.yaml
@@ -0,0 +1,79 @@
+openapi: "3.0.0"
+info:
+  version: 1.0.0
+  title: Test inline response model
+  description: Test inline response model.
+  license:
+    name: MIT
+paths:
+  /foobar:
+    get:
+      operationId: testOperation
+      description: No type property in modelJson of InlineResponse200
+      responses:
+        200:
+          description: InlineResponse200 itself.
+          content:
+            application/json:
+              schema:
+                type: object
+                # It is legal to use the `format` keyword for object types. The JSON schema specification explicitly allows this.
+                # Even if in practice most OAS authors use `format` for primitive types, it should still be allowed to use format for object types.
+                format: unknown
+                properties:
+                  foo:
+                    type: string
+                  bar:
+                    type: string
+    post:
+      operationId: testOperationPost
+      description: No type property in modelJson of InlineResponse200
+      responses:
+        400:
+          description: InlineResponse200 itself.
+          content:
+            application/json:
+              schema:
+                title: FooBarObject
+                type: object
+                # It is legal to use the `format` keyword for object types. The JSON schema specification explicitly allows this.
+                # Even if in practice most OAS authors use `format` for primitive types, it should still be allowed to use format for object types.
+                format: date-time
+                properties:
+                  foo:
+                    type: string
+components:
+  schemas:
+    Animal:
+      type: object
+      discriminator: className
+      required:
+        - className
+      properties:
+        className:
+          type: string
+        color:
+          type: string
+          default: 'red'
+    Dog:
+      allOf:
+        - $ref: '#/components/schemas/Animal'
+        - type: object
+          properties:
+            breed:
+              type: string
+    Cat:
+      allOf:
+        - $ref: '#/components/schemas/Animal'
+        - type: object
+          properties:
+            declawed:
+              type: boolean
+    HugeCat:
+      allOf:
+        - $ref: '#/components/schemas/Cat'
+        - type: object
+          properties:
+            kind:
+              type: string
+              enum: [lions, tigers, leopards, jaguars]
\ No newline at end of file
diff --git a/samples/client/petstore/go-experimental/go-petstore/api/openapi.yaml b/samples/client/petstore/go-experimental/go-petstore/api/openapi.yaml
index 7a47b6f9bee..2fe0565e0a5 100644
--- a/samples/client/petstore/go-experimental/go-petstore/api/openapi.yaml
+++ b/samples/client/petstore/go-experimental/go-petstore/api/openapi.yaml
@@ -2090,10 +2090,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2103,6 +2105,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/go/go-petstore-withXml/api/openapi.yaml b/samples/client/petstore/go/go-petstore-withXml/api/openapi.yaml
index 7a47b6f9bee..2fe0565e0a5 100644
--- a/samples/client/petstore/go/go-petstore-withXml/api/openapi.yaml
+++ b/samples/client/petstore/go/go-petstore-withXml/api/openapi.yaml
@@ -2090,10 +2090,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2103,6 +2105,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/go/go-petstore/api/openapi.yaml b/samples/client/petstore/go/go-petstore/api/openapi.yaml
index 7a47b6f9bee..2fe0565e0a5 100644
--- a/samples/client/petstore/go/go-petstore/api/openapi.yaml
+++ b/samples/client/petstore/go/go-petstore/api/openapi.yaml
@@ -2090,10 +2090,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2103,6 +2105,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/haskell-http-client/openapi.yaml b/samples/client/petstore/haskell-http-client/openapi.yaml
index 7a47b6f9bee..2fe0565e0a5 100644
--- a/samples/client/petstore/haskell-http-client/openapi.yaml
+++ b/samples/client/petstore/haskell-http-client/openapi.yaml
@@ -2090,10 +2090,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2103,6 +2105,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/feign/api/openapi.yaml b/samples/client/petstore/java/feign/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/feign/api/openapi.yaml
+++ b/samples/client/petstore/java/feign/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/google-api-client/api/openapi.yaml b/samples/client/petstore/java/google-api-client/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/google-api-client/api/openapi.yaml
+++ b/samples/client/petstore/java/google-api-client/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/jersey1/api/openapi.yaml b/samples/client/petstore/java/jersey1/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/jersey1/api/openapi.yaml
+++ b/samples/client/petstore/java/jersey1/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/jersey2-java8/api/openapi.yaml b/samples/client/petstore/java/jersey2-java8/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/jersey2-java8/api/openapi.yaml
+++ b/samples/client/petstore/java/jersey2-java8/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/native-async/api/openapi.yaml b/samples/client/petstore/java/native-async/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/native-async/api/openapi.yaml
+++ b/samples/client/petstore/java/native-async/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/native/api/openapi.yaml b/samples/client/petstore/java/native/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/native/api/openapi.yaml
+++ b/samples/client/petstore/java/native/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/okhttp-gson-parcelableModel/api/openapi.yaml b/samples/client/petstore/java/okhttp-gson-parcelableModel/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/okhttp-gson-parcelableModel/api/openapi.yaml
+++ b/samples/client/petstore/java/okhttp-gson-parcelableModel/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/okhttp-gson/api/openapi.yaml b/samples/client/petstore/java/okhttp-gson/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/okhttp-gson/api/openapi.yaml
+++ b/samples/client/petstore/java/okhttp-gson/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/rest-assured-jackson/api/openapi.yaml b/samples/client/petstore/java/rest-assured-jackson/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/rest-assured-jackson/api/openapi.yaml
+++ b/samples/client/petstore/java/rest-assured-jackson/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/rest-assured/api/openapi.yaml b/samples/client/petstore/java/rest-assured/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/rest-assured/api/openapi.yaml
+++ b/samples/client/petstore/java/rest-assured/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/resteasy/api/openapi.yaml b/samples/client/petstore/java/resteasy/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/resteasy/api/openapi.yaml
+++ b/samples/client/petstore/java/resteasy/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/resttemplate-withXml/api/openapi.yaml b/samples/client/petstore/java/resttemplate-withXml/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/resttemplate-withXml/api/openapi.yaml
+++ b/samples/client/petstore/java/resttemplate-withXml/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/resttemplate/api/openapi.yaml b/samples/client/petstore/java/resttemplate/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/resttemplate/api/openapi.yaml
+++ b/samples/client/petstore/java/resttemplate/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/retrofit2-play26/api/openapi.yaml b/samples/client/petstore/java/retrofit2-play26/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/retrofit2-play26/api/openapi.yaml
+++ b/samples/client/petstore/java/retrofit2-play26/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/retrofit2/api/openapi.yaml b/samples/client/petstore/java/retrofit2/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/retrofit2/api/openapi.yaml
+++ b/samples/client/petstore/java/retrofit2/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/retrofit2rx2/api/openapi.yaml b/samples/client/petstore/java/retrofit2rx2/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/retrofit2rx2/api/openapi.yaml
+++ b/samples/client/petstore/java/retrofit2rx2/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/retrofit2rx3/api/openapi.yaml b/samples/client/petstore/java/retrofit2rx3/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/retrofit2rx3/api/openapi.yaml
+++ b/samples/client/petstore/java/retrofit2rx3/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/vertx/api/openapi.yaml b/samples/client/petstore/java/vertx/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/vertx/api/openapi.yaml
+++ b/samples/client/petstore/java/vertx/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/client/petstore/java/webclient/api/openapi.yaml b/samples/client/petstore/java/webclient/api/openapi.yaml
index a49359fd348..00cc0f2f4c2 100644
--- a/samples/client/petstore/java/webclient/api/openapi.yaml
+++ b/samples/client/petstore/java/webclient/api/openapi.yaml
@@ -2151,10 +2151,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2164,6 +2166,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/openapi3/client/petstore/go-experimental/go-petstore/api/openapi.yaml b/samples/openapi3/client/petstore/go-experimental/go-petstore/api/openapi.yaml
index 7e77947b7a7..4bb7abdc392 100644
--- a/samples/openapi3/client/petstore/go-experimental/go-petstore/api/openapi.yaml
+++ b/samples/openapi3/client/petstore/go-experimental/go-petstore/api/openapi.yaml
@@ -1999,6 +1999,7 @@ components:
       properties:
         string:
           $ref: '#/components/schemas/Foo'
+      type: object
     inline_object:
       properties:
         name:
@@ -2138,10 +2139,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/openapi3/client/petstore/go/go-petstore/api/openapi.yaml b/samples/openapi3/client/petstore/go/go-petstore/api/openapi.yaml
index af7148414b9..51e7c243284 100644
--- a/samples/openapi3/client/petstore/go/go-petstore/api/openapi.yaml
+++ b/samples/openapi3/client/petstore/go/go-petstore/api/openapi.yaml
@@ -1920,6 +1920,7 @@ components:
       properties:
         string:
           $ref: '#/components/schemas/Foo'
+      type: object
     inline_object:
       properties:
         name:
@@ -2059,10 +2060,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/openapi3/client/petstore/java/jersey2-java8/api/openapi.yaml b/samples/openapi3/client/petstore/java/jersey2-java8/api/openapi.yaml
index 373650648fe..e09549a0c3d 100644
--- a/samples/openapi3/client/petstore/java/jersey2-java8/api/openapi.yaml
+++ b/samples/openapi3/client/petstore/java/jersey2-java8/api/openapi.yaml
@@ -2249,6 +2249,7 @@ components:
       properties:
         string:
           $ref: '#/components/schemas/Foo'
+      type: object
     inline_object:
       properties:
         name:
@@ -2390,14 +2391,17 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     ChildCat_allOf:
       properties:
         name:
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/server/petstore/java-play-framework-fake-endpoints/public/openapi.json b/samples/server/petstore/java-play-framework-fake-endpoints/public/openapi.json
index ebe044bed92..f5f2da4a943 100644
--- a/samples/server/petstore/java-play-framework-fake-endpoints/public/openapi.json
+++ b/samples/server/petstore/java-play-framework-fake-endpoints/public/openapi.json
@@ -2831,14 +2831,16 @@
           "breed" : {
             "type" : "string"
           }
-        }
+        },
+        "type" : "object"
       },
       "Cat_allOf" : {
         "properties" : {
           "declawed" : {
             "type" : "boolean"
           }
-        }
+        },
+        "type" : "object"
       },
       "BigCat_allOf" : {
         "properties" : {
@@ -2846,7 +2848,8 @@
             "enum" : [ "lions", "tigers", "leopards", "jaguars" ],
             "type" : "string"
           }
-        }
+        },
+        "type" : "object"
       }
     },
     "securitySchemes" : {
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/main/openapi/openapi.yaml b/samples/server/petstore/jaxrs-spec-interface/src/main/openapi/openapi.yaml
index da95378bbc8..7d1bd12ec82 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/main/openapi/openapi.yaml
+++ b/samples/server/petstore/jaxrs-spec-interface/src/main/openapi/openapi.yaml
@@ -2225,10 +2225,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2238,6 +2240,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/server/petstore/jaxrs-spec/src/main/openapi/openapi.yaml b/samples/server/petstore/jaxrs-spec/src/main/openapi/openapi.yaml
index da95378bbc8..7d1bd12ec82 100644
--- a/samples/server/petstore/jaxrs-spec/src/main/openapi/openapi.yaml
+++ b/samples/server/petstore/jaxrs-spec/src/main/openapi/openapi.yaml
@@ -2225,10 +2225,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2238,6 +2240,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/server/petstore/rust-server/output/multipart-v3/api/openapi.yaml b/samples/server/petstore/rust-server/output/multipart-v3/api/openapi.yaml
index cc003383b96..a1a58c5e69c 100644
--- a/samples/server/petstore/rust-server/output/multipart-v3/api/openapi.yaml
+++ b/samples/server/petstore/rust-server/output/multipart-v3/api/openapi.yaml
@@ -132,4 +132,5 @@ components:
           type: array
       required:
       - field_a
+      type: object
 
diff --git a/samples/server/petstore/rust-server/output/openapi-v3/api/openapi.yaml b/samples/server/petstore/rust-server/output/openapi-v3/api/openapi.yaml
index 907d126e3da..984374b520a 100644
--- a/samples/server/petstore/rust-server/output/openapi-v3/api/openapi.yaml
+++ b/samples/server/petstore/rust-server/output/openapi-v3/api/openapi.yaml
@@ -606,6 +606,7 @@ components:
       properties:
         foo:
           type: string
+      type: object
   securitySchemes:
     authScheme:
       flows:
diff --git a/samples/server/petstore/rust-server/output/petstore-with-fake-endpoints-models-for-testing/api/openapi.yaml b/samples/server/petstore/rust-server/output/petstore-with-fake-endpoints-models-for-testing/api/openapi.yaml
index 27f96b0bef1..02f3dc603a4 100644
--- a/samples/server/petstore/rust-server/output/petstore-with-fake-endpoints-models-for-testing/api/openapi.yaml
+++ b/samples/server/petstore/rust-server/output/petstore-with-fake-endpoints-models-for-testing/api/openapi.yaml
@@ -1565,10 +1565,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
   securitySchemes:
     petstore_auth:
       flows:
diff --git a/samples/server/petstore/rust-server/output/rust-server-test/api/openapi.yaml b/samples/server/petstore/rust-server/output/rust-server-test/api/openapi.yaml
index 276349f7a0e..59a9a76b887 100644
--- a/samples/server/petstore/rust-server/output/rust-server-test/api/openapi.yaml
+++ b/samples/server/petstore/rust-server/output/rust-server-test/api/openapi.yaml
@@ -211,4 +211,5 @@ components:
           type: integer
       required:
       - required_thing
+      type: object
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/resources/openapi.yaml b/samples/server/petstore/springboot-reactive/src/main/resources/openapi.yaml
index da95378bbc8..7d1bd12ec82 100644
--- a/samples/server/petstore/springboot-reactive/src/main/resources/openapi.yaml
+++ b/samples/server/petstore/springboot-reactive/src/main/resources/openapi.yaml
@@ -2225,10 +2225,12 @@ components:
       properties:
         breed:
           type: string
+      type: object
     Cat_allOf:
       properties:
         declawed:
           type: boolean
+      type: object
     BigCat_allOf:
       properties:
         kind:
@@ -2238,6 +2240,7 @@ components:
           - leopards
           - jaguars
           type: string
+      type: object
   securitySchemes:
     petstore_auth:
       flows: