Update app.py

app.py

@@ -107,7 +107,7 @@ def apply_replacements(text):
     return text
 
 
-def chat_with_openai(message: str, history: list, temperature: float, max_new_tokens: int, fast_mode=false):
+def chat_with_openai(message: str, history: list, temperature: float, max_new_tokens: int, fast_mode: bool = False):
     """
     Call the OpenAI ChatCompletion endpoint using the new client and yield streaming responses.
     Implements <think> logic: