Fix GPT-4 Turbo max_tokens limit (4096 max)

app.py

@@ -78,7 +78,7 @@ def load_from_hf_space(repo_id=HF_REPO_ID, token=HF_TOKEN):
         return None
 
 # --- OpenAI API function ---
-def call_openai_api(prompt_text, max_tokens=5000):
+def call_openai_api(prompt_text, max_tokens=4000):
     """
     Call OpenAI API to generate JSON response from the prompt template
     """