Update app.py

app.py

@@ -23,7 +23,7 @@ SHEET = init_gsheet()
 # ===  API ===
 api_key = os.getenv("OPENAI_API_KEY") 
 client = OpenAI(api_key=api_key)
-MODEL_NAME = "gpt-5-mini"
+MODEL_NAME = "gpt-5.4-mini"
 
 INTRO_TEXT = """
 <div>