diff --git a/python/packages/autogen-ext/src/autogen_ext/models/openai/_openai_client.py b/python/packages/autogen-ext/src/autogen_ext/models/openai/_openai_client.py
index 04512d7ce9b2..3cfcb1c1b923 100644
--- a/python/packages/autogen-ext/src/autogen_ext/models/openai/_openai_client.py
+++ b/python/packages/autogen-ext/src/autogen_ext/models/openai/_openai_client.py
@@ -575,7 +575,7 @@ async def create(
                 for x in choice.logprobs.content
             ]
         response = CreateResult(
-            finish_reason=finish_reason,  # type: ignore
+            finish_reason=normalize_stop_reason(finish_reason),
             content=content,
             usage=usage,
             cached=False,