diff --git a/litellm/responses/litellm_completion_transformation/transformation.py b/litellm/responses/litellm_completion_transformation/transformation.py
index 900f56fea26..dd41b73930f 100644
--- a/litellm/responses/litellm_completion_transformation/transformation.py
+++ b/litellm/responses/litellm_completion_transformation/transformation.py
@@ -1500,7 +1500,7 @@ class LiteLLMCompletionResponsesConfig:
             previous_response_id=getattr(
                 chat_completion_response, "previous_response_id", None
             ),
-            reasoning=dict(Reasoning()),
+            reasoning=None,
             status=LiteLLMCompletionResponsesConfig._map_chat_completion_finish_reason_to_responses_status(
                 finish_reason
             ),