diff --git a/litellm/llms/anthropic/experimental_pass_through/adapters/handler.py b/litellm/llms/anthropic/experimental_pass_through/adapters/handler.py
index 01c8f39ee80..4935c65f407 100644
--- a/litellm/llms/anthropic/experimental_pass_through/adapters/handler.py
+++ b/litellm/llms/anthropic/experimental_pass_through/adapters/handler.py
@@ -78,7 +78,7 @@ class LiteLLMMessagesToCompletionTransformationHandler:
             completion_kwargs["model"] = f"responses/{model}"
             
         reasoning_effort = completion_kwargs.get("reasoning_effort")
-        summary = thinking.get("summary") if isinstance(thinking, dict) else None
+        summary = thinking.get("summary")
         if isinstance(reasoning_effort, str) and reasoning_effort:
             reasoning_dict: Dict[str, Any] = {"effort": reasoning_effort}
             if summary:
diff --git a/litellm/llms/anthropic/experimental_pass_through/adapters/transformation.py b/litellm/llms/anthropic/experimental_pass_through/adapters/transformation.py
index 2af5e35112c..ca1a94237a6 100644
--- a/litellm/llms/anthropic/experimental_pass_through/adapters/transformation.py
+++ b/litellm/llms/anthropic/experimental_pass_through/adapters/transformation.py
@@ -892,7 +892,11 @@ class LiteLLMAnthropicMessagesAdapter:
                         cast(Dict[str, Any], thinking)
                     )
                     if reasoning_effort:
-                        new_kwargs["reasoning_effort"] = reasoning_effort
+                        summary = thinking.get("summary") if isinstance(thinking, dict) else None
+                        if summary:
+                            new_kwargs["reasoning_effort"] = {"effort": reasoning_effort, "summary": summary}
+                        else:
+                            new_kwargs["reasoning_effort"] = reasoning_effort
 
         ## CONVERT OUTPUT_FORMAT to RESPONSE_FORMAT
         if "output_format" in anthropic_message_request: