diff --git a/modules/openapi-generator/src/main/resources/python/model_templates/methods_shared.mustache b/modules/openapi-generator/src/main/resources/python/model_templates/methods_shared.mustache
index 5ffef97f6b..e38832a4a5 100644
--- a/modules/openapi-generator/src/main/resources/python/model_templates/methods_shared.mustache
+++ b/modules/openapi-generator/src/main/resources/python/model_templates/methods_shared.mustache
@@ -27,7 +27,7 @@
         if self.get("_spec_property_naming", False):
             new_inst = cls._new_from_openapi_data()
         else:
-            new_inst = cls.__new__(cls)
+            new_inst = cls.__new__(cls, **self.__dict__)
 
         for k, v in self.__dict__.items():
             setattr(new_inst, k, deepcopy(v, memo))
diff --git a/samples/client/petstore/python/petstore_api/model_utils.py b/samples/client/petstore/python/petstore_api/model_utils.py
index 933ceec6fa..ab2d0087df 100644
--- a/samples/client/petstore/python/petstore_api/model_utils.py
+++ b/samples/client/petstore/python/petstore_api/model_utils.py
@@ -205,7 +205,7 @@ class OpenApiModel(object):
         if self.get("_spec_property_naming", False):
             new_inst = cls._new_from_openapi_data()
         else:
-            new_inst = cls.__new__(cls)
+            new_inst = cls.__new__(cls, **self.__dict__)
 
         for k, v in self.__dict__.items():
             setattr(new_inst, k, deepcopy(v, memo))
diff --git a/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/model_utils.py b/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/model_utils.py
index 933ceec6fa..ab2d0087df 100644
--- a/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/model_utils.py
+++ b/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/model_utils.py
@@ -205,7 +205,7 @@ class OpenApiModel(object):
         if self.get("_spec_property_naming", False):
             new_inst = cls._new_from_openapi_data()
         else:
-            new_inst = cls.__new__(cls)
+            new_inst = cls.__new__(cls, **self.__dict__)
 
         for k, v in self.__dict__.items():
             setattr(new_inst, k, deepcopy(v, memo))
diff --git a/samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/model_utils.py b/samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/model_utils.py
index a2711d1362..d90e2383d8 100644
--- a/samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/model_utils.py
+++ b/samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/model_utils.py
@@ -205,7 +205,7 @@ class OpenApiModel(object):
         if self.get("_spec_property_naming", False):
             new_inst = cls._new_from_openapi_data()
         else:
-            new_inst = cls.__new__(cls)
+            new_inst = cls.__new__(cls, **self.__dict__)
 
         for k, v in self.__dict__.items():
             setattr(new_inst, k, deepcopy(v, memo))
diff --git a/samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/model_utils.py b/samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/model_utils.py
index 38902e7afd..a7da81cfaf 100644
--- a/samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/model_utils.py
+++ b/samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/model_utils.py
@@ -205,7 +205,7 @@ class OpenApiModel(object):
         if self.get("_spec_property_naming", False):
             new_inst = cls._new_from_openapi_data()
         else:
-            new_inst = cls.__new__(cls)
+            new_inst = cls.__new__(cls, **self.__dict__)
 
         for k, v in self.__dict__.items():
             setattr(new_inst, k, deepcopy(v, memo))
diff --git a/samples/openapi3/client/petstore/python/petstore_api/model_utils.py b/samples/openapi3/client/petstore/python/petstore_api/model_utils.py
index 933ceec6fa..ab2d0087df 100644
--- a/samples/openapi3/client/petstore/python/petstore_api/model_utils.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/model_utils.py
@@ -205,7 +205,7 @@ class OpenApiModel(object):
         if self.get("_spec_property_naming", False):
             new_inst = cls._new_from_openapi_data()
         else:
-            new_inst = cls.__new__(cls)
+            new_inst = cls.__new__(cls, **self.__dict__)
 
         for k, v in self.__dict__.items():
             setattr(new_inst, k, deepcopy(v, memo))
diff --git a/samples/openapi3/client/petstore/python/tests_manual/test_copy.py b/samples/openapi3/client/petstore/python/tests_manual/test_copy.py
index 35bd9a31a2..e70fd67b34 100644
--- a/samples/openapi3/client/petstore/python/tests_manual/test_copy.py
+++ b/samples/openapi3/client/petstore/python/tests_manual/test_copy.py
@@ -2,7 +2,7 @@ from copy import deepcopy
 import unittest
 from petstore_api.model.mammal import Mammal
 from petstore_api.model.triangle import Triangle
-
+from petstore_api.model.dog import Dog
 
 class TestCopy(unittest.TestCase):
     """TestCopy unit test stubs"""
@@ -29,6 +29,14 @@ class TestCopy(unittest.TestCase):
         assert id(deepcopy(obj)) != id(obj)
         assert deepcopy(obj) == obj
 
+        obj = Dog._new_from_openapi_data(class_name='Dog', color='white', breed='Jack Russel Terrier')
+        assert id(deepcopy(obj)) != id(obj)
+        assert deepcopy(obj) == obj
+
+        obj = Dog(class_name='Dog', color='white', breed='Jack Russel Terrier')
+        assert id(deepcopy(obj)) != id(obj)
+        assert deepcopy(obj) == obj
+
 
 if __name__ == '__main__':
     unittest.main()