diff --git a/litellm/llms/openai/chat/gpt_5_transformation.py b/litellm/llms/openai/chat/gpt_5_transformation.py
index fa357c1bd22..183f60debbd 100644
--- a/litellm/llms/openai/chat/gpt_5_transformation.py
+++ b/litellm/llms/openai/chat/gpt_5_transformation.py
@@ -41,6 +41,7 @@ class OpenAIGPT5Config(OpenAIGPTConfig):
             "presence_penalty",
             "frequency_penalty",
             "top_logprobs",
+            "stop",
         ]
 
         return [