diff --git a/litellm/completion_extras/litellm_responses_transformation/transformation.py b/litellm/completion_extras/litellm_responses_transformation/transformation.py
index f35510e41b..5f732fc521 100644
--- a/litellm/completion_extras/litellm_responses_transformation/transformation.py
+++ b/litellm/completion_extras/litellm_responses_transformation/transformation.py
@@ -460,6 +460,8 @@ class LiteLLMResponsesTransformationHandler(CompletionTransformationBridge):
             return Reasoning(effort="medium", summary="auto")
         elif reasoning_effort == "low":
             return Reasoning(effort="low", summary="auto")
+        elif reasoning_effort == "minimal":
+            return Reasoning(effort="minimal", summary="auto")
         return None
 
     def _map_responses_status_to_finish_reason(self, status: Optional[str]) -> str:
diff --git a/litellm/types/llms/openai.py b/litellm/types/llms/openai.py
index bc3cfeee6a..f2f64fa3c5 100644
--- a/litellm/types/llms/openai.py
+++ b/litellm/types/llms/openai.py
@@ -1302,7 +1302,7 @@ ResponsesAPIStreamingResponse = Annotated[
 ]
 
 
-REASONING_EFFORT = Literal["low", "medium", "high"]
+REASONING_EFFORT = Literal["minimal", "low", "medium", "high"]
 
 
 class OpenAIRealtimeStreamSession(TypedDict, total=False):