diff --git a/modules/openapi-generator/src/main/resources/python/api_client.mustache b/modules/openapi-generator/src/main/resources/python/api_client.mustache
index 2ae005378fac..67395798dde6 100644
--- a/modules/openapi-generator/src/main/resources/python/api_client.mustache
+++ b/modules/openapi-generator/src/main/resources/python/api_client.mustache
@@ -13,6 +13,7 @@ import tempfile
 
 from urllib.parse import quote
 from typing import Tuple, Optional, List, Dict, Union
+from pydantic import SecretStr
 {{#tornado}}
 import tornado.gen
 {{/tornado}}
@@ -344,6 +345,7 @@ class ApiClient:
         """Builds a JSON POST object.
 
         If obj is None, return None.
+        If obj is SecretStr, return obj.get_secret_value()
         If obj is str, int, long, float, bool, return directly.
         If obj is datetime.datetime, datetime.date
             convert to string in iso8601 format.
@@ -356,6 +358,8 @@ class ApiClient:
         """
         if obj is None:
             return None
+        elif isinstance(obj, SecretStr):
+            return obj.get_secret_value()
         elif isinstance(obj, self.PRIMITIVE_TYPES):
             return obj
         elif isinstance(obj, list):
@@ -377,7 +381,10 @@ class ApiClient:
             # and attributes which value is not None.
             # Convert attribute name to json key in
             # model definition for request.
-            obj_dict = obj.to_dict()
+            if hasattr(obj, 'to_dict') and callable(getattr(obj, 'to_dict')):
+                obj_dict = obj.to_dict()
+            else:
+                obj_dict = obj.__dict__
 
         return {
             key: self.sanitize_for_serialization(val)
diff --git a/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/api_client.py b/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/api_client.py
index 4b31ba81410b..b03fdf002669 100644
--- a/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/api_client.py
+++ b/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/api_client.py
@@ -24,6 +24,7 @@
 
 from urllib.parse import quote
 from typing import Tuple, Optional, List, Dict, Union
+from pydantic import SecretStr
 
 from openapi_client.configuration import Configuration
 from openapi_client.api_response import ApiResponse, T as ApiResponseT
@@ -337,6 +338,7 @@ def sanitize_for_serialization(self, obj):
         """Builds a JSON POST object.
 
         If obj is None, return None.
+        If obj is SecretStr, return obj.get_secret_value()
         If obj is str, int, long, float, bool, return directly.
         If obj is datetime.datetime, datetime.date
             convert to string in iso8601 format.
@@ -349,6 +351,8 @@ def sanitize_for_serialization(self, obj):
         """
         if obj is None:
             return None
+        elif isinstance(obj, SecretStr):
+            return obj.get_secret_value()
         elif isinstance(obj, self.PRIMITIVE_TYPES):
             return obj
         elif isinstance(obj, list):
@@ -370,7 +374,10 @@ def sanitize_for_serialization(self, obj):
             # and attributes which value is not None.
             # Convert attribute name to json key in
             # model definition for request.
-            obj_dict = obj.to_dict()
+            if hasattr(obj, 'to_dict') and callable(getattr(obj, 'to_dict')):
+                obj_dict = obj.to_dict()
+            else:
+                obj_dict = obj.__dict__
 
         return {
             key: self.sanitize_for_serialization(val)
diff --git a/samples/client/echo_api/python/openapi_client/api_client.py b/samples/client/echo_api/python/openapi_client/api_client.py
index 4b31ba81410b..b03fdf002669 100644
--- a/samples/client/echo_api/python/openapi_client/api_client.py
+++ b/samples/client/echo_api/python/openapi_client/api_client.py
@@ -24,6 +24,7 @@
 
 from urllib.parse import quote
 from typing import Tuple, Optional, List, Dict, Union
+from pydantic import SecretStr
 
 from openapi_client.configuration import Configuration
 from openapi_client.api_response import ApiResponse, T as ApiResponseT
@@ -337,6 +338,7 @@ def sanitize_for_serialization(self, obj):
         """Builds a JSON POST object.
 
         If obj is None, return None.
+        If obj is SecretStr, return obj.get_secret_value()
         If obj is str, int, long, float, bool, return directly.
         If obj is datetime.datetime, datetime.date
             convert to string in iso8601 format.
@@ -349,6 +351,8 @@ def sanitize_for_serialization(self, obj):
         """
         if obj is None:
             return None
+        elif isinstance(obj, SecretStr):
+            return obj.get_secret_value()
         elif isinstance(obj, self.PRIMITIVE_TYPES):
             return obj
         elif isinstance(obj, list):
@@ -370,7 +374,10 @@ def sanitize_for_serialization(self, obj):
             # and attributes which value is not None.
             # Convert attribute name to json key in
             # model definition for request.
-            obj_dict = obj.to_dict()
+            if hasattr(obj, 'to_dict') and callable(getattr(obj, 'to_dict')):
+                obj_dict = obj.to_dict()
+            else:
+                obj_dict = obj.__dict__
 
         return {
             key: self.sanitize_for_serialization(val)
diff --git a/samples/openapi3/client/petstore/python-aiohttp/petstore_api/api_client.py b/samples/openapi3/client/petstore/python-aiohttp/petstore_api/api_client.py
index 805773a9440e..0d941bcd0e48 100644
--- a/samples/openapi3/client/petstore/python-aiohttp/petstore_api/api_client.py
+++ b/samples/openapi3/client/petstore/python-aiohttp/petstore_api/api_client.py
@@ -23,6 +23,7 @@
 
 from urllib.parse import quote
 from typing import Tuple, Optional, List, Dict, Union
+from pydantic import SecretStr
 
 from petstore_api.configuration import Configuration
 from petstore_api.api_response import ApiResponse, T as ApiResponseT
@@ -339,6 +340,7 @@ def sanitize_for_serialization(self, obj):
         """Builds a JSON POST object.
 
         If obj is None, return None.
+        If obj is SecretStr, return obj.get_secret_value()
         If obj is str, int, long, float, bool, return directly.
         If obj is datetime.datetime, datetime.date
             convert to string in iso8601 format.
@@ -351,6 +353,8 @@ def sanitize_for_serialization(self, obj):
         """
         if obj is None:
             return None
+        elif isinstance(obj, SecretStr):
+            return obj.get_secret_value()
         elif isinstance(obj, self.PRIMITIVE_TYPES):
             return obj
         elif isinstance(obj, list):
@@ -372,7 +376,10 @@ def sanitize_for_serialization(self, obj):
             # and attributes which value is not None.
             # Convert attribute name to json key in
             # model definition for request.
-            obj_dict = obj.to_dict()
+            if hasattr(obj, 'to_dict') and callable(getattr(obj, 'to_dict')):
+                obj_dict = obj.to_dict()
+            else:
+                obj_dict = obj.__dict__
 
         return {
             key: self.sanitize_for_serialization(val)
diff --git a/samples/openapi3/client/petstore/python/petstore_api/api_client.py b/samples/openapi3/client/petstore/python/petstore_api/api_client.py
index 4ae5a65c91f4..18c5803cb5cf 100755
--- a/samples/openapi3/client/petstore/python/petstore_api/api_client.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/api_client.py
@@ -23,6 +23,7 @@
 
 from urllib.parse import quote
 from typing import Tuple, Optional, List, Dict, Union
+from pydantic import SecretStr
 
 from petstore_api.configuration import Configuration
 from petstore_api.api_response import ApiResponse, T as ApiResponseT
@@ -336,6 +337,7 @@ def sanitize_for_serialization(self, obj):
         """Builds a JSON POST object.
 
         If obj is None, return None.
+        If obj is SecretStr, return obj.get_secret_value()
         If obj is str, int, long, float, bool, return directly.
         If obj is datetime.datetime, datetime.date
             convert to string in iso8601 format.
@@ -348,6 +350,8 @@ def sanitize_for_serialization(self, obj):
         """
         if obj is None:
             return None
+        elif isinstance(obj, SecretStr):
+            return obj.get_secret_value()
         elif isinstance(obj, self.PRIMITIVE_TYPES):
             return obj
         elif isinstance(obj, list):
@@ -369,7 +373,10 @@ def sanitize_for_serialization(self, obj):
             # and attributes which value is not None.
             # Convert attribute name to json key in
             # model definition for request.
-            obj_dict = obj.to_dict()
+            if hasattr(obj, 'to_dict') and callable(getattr(obj, 'to_dict')):
+                obj_dict = obj.to_dict()
+            else:
+                obj_dict = obj.__dict__
 
         return {
             key: self.sanitize_for_serialization(val)
diff --git a/samples/openapi3/client/petstore/python/tests/test_model.py b/samples/openapi3/client/petstore/python/tests/test_model.py
index 9ca69d0a53c5..1d3c29e2f4a1 100644
--- a/samples/openapi3/client/petstore/python/tests/test_model.py
+++ b/samples/openapi3/client/petstore/python/tests/test_model.py
@@ -8,7 +8,7 @@
 import time
 import unittest
 
-from pydantic import ValidationError
+from pydantic import ValidationError, SecretStr, BaseModel, StrictStr, Field
 import pytest
 
 import petstore_api
@@ -407,9 +407,17 @@ def test_valdiator(self):
         a.pattern_with_digits_and_delimiter = "image_123"
         self.assertEqual(a.pattern_with_digits_and_delimiter, "image_123")
 
-        # test sanitize for serializaation with SecretStr (format: password)
+        # test sanitize for serialization with different data types
         self.assertEquals(petstore_api.ApiClient().sanitize_for_serialization(a), {'byte': b'string', 'date': '2013-09-17', 'number': 123.45, 'password': 'testing09876', 'pattern_with_digits_and_delimiter': 'image_123'})
 
+        # test sanitize for serialization with SecretStr (format: password)
+        class LoginTest(BaseModel):
+            username: StrictStr = Field(min_length=2, strict=True, max_length=64)
+            password: SecretStr
+        
+        l = LoginTest(username="admin", password=SecretStr("testing09876"))
+        self.assertEqual(petstore_api.ApiClient().sanitize_for_serialization(l), {'username': "admin", 'password': "testing09876"})
+
     def test_inline_enum_validator(self):
         self.pet = petstore_api.Pet(name="test name", photoUrls=["string"])
         self.pet.id = 1