diff --git a/autogen/oai/completion.py b/autogen/oai/completion.py
index 55ca278f8..fa0161612 100644
--- a/autogen/oai/completion.py
+++ b/autogen/oai/completion.py
@@ -194,7 +194,8 @@ class Completion(openai_Completion):
                 return response
         openai_completion = (
             openai.ChatCompletion
-            if config["model"] in cls.chat_models or issubclass(cls, ChatCompletion)
+            if config["model"].replace("gpt-35-turbo", "gpt-3.5-turbo") in cls.chat_models
+            or issubclass(cls, ChatCompletion)
             else openai.Completion
         )
         start_time = time.time()