diff --git a/open-sse/translator/request/openai-responses.js b/open-sse/translator/request/openai-responses.js
index 98c516cd..ca06731d 100644
--- a/open-sse/translator/request/openai-responses.js
+++ b/open-sse/translator/request/openai-responses.js
@@ -189,6 +189,7 @@ export function openaiResponsesToOpenAIRequest(model, body, stream, credentials)
   delete result.prompt_cache_key;
   delete result.store;
   delete result.reasoning;
+  delete result.client_metadata;
 
   return result;
 }