diff --git a/litellm/completion_extras/litellm_responses_transformation/transformation.py b/litellm/completion_extras/litellm_responses_transformation/transformation.py
index b060f22d355..cb358498968 100644
--- a/litellm/completion_extras/litellm_responses_transformation/transformation.py
+++ b/litellm/completion_extras/litellm_responses_transformation/transformation.py
@@ -538,16 +538,20 @@ class LiteLLMResponsesTransformationHandler(CompletionTransformationBridge):
 
         return cast(List["ALL_RESPONSES_API_TOOL_PARAMS"], responses_tools)
 
-    def _map_reasoning_effort(self, reasoning_effort: str) -> Optional[Reasoning]:
+    def _map_reasoning_effort(self, reasoning_effort: Union[str, Dict[str, Any]]) -> Optional[Reasoning]:
+        # If dict is passed, convert it directly to Reasoning object
+        if isinstance(reasoning_effort, dict):
+            return Reasoning(**reasoning_effort)
+
+        # If string is passed, map without summary (default)
         if reasoning_effort == "high":
-            return Reasoning(effort="high", summary="detailed")
+            return Reasoning(effort="high")
         elif reasoning_effort == "medium":
-            # docs say "summary": "concise" is also an option, but it was rejected in practice, so defaulting "auto"
-            return Reasoning(effort="medium", summary="auto")
+            return Reasoning(effort="medium")
         elif reasoning_effort == "low":
-            return Reasoning(effort="low", summary="auto")
+            return Reasoning(effort="low")
         elif reasoning_effort == "minimal":
-            return Reasoning(effort="minimal", summary="auto")
+            return Reasoning(effort="minimal")
         return None
 
     def _map_responses_status_to_finish_reason(self, status: Optional[str]) -> str: