Fix temp setting for GPT-5

Author: miguelg719

.changeset/towering-organic-grouse.md

@@ -0,0 +1,5 @@
+---
+"stagehand": patch
+---
+
+Fix temperature setting for GPT-5 family of models

stagehand/llm/client.py

@@ -110,6 +110,10 @@ def create_response(
         filtered_params = {
             k: v for k, v in params.items() if v is not None or k in kwargs
         }
+        # Fixes parameters for GPT-5 family of models
+        if "gpt-5" in completion_model:
+            filtered_params["temperature"] = 1
+
 
         self.logger.debug(
             f"Calling litellm.completion with model={completion_model} and params: {filtered_params}",