Switch to OpenAI gpt-4o-mini

app.py

@@ -52,13 +52,13 @@ def build_agent():
         except Exception as e:
             return f"Error downloading file: {e}"
 
-    groq_api_key = os.getenv("GROQ_API_KEY")
-    if not groq_api_key:
-        raise ValueError("GROQ_API_KEY environment variable not set. Add it as a Secret in your HF Space settings.")
+    openai_api_key = os.getenv("OPENAI_API_KEY")
+    if not openai_api_key:
+        raise ValueError("OPENAI_API_KEY environment variable not set. Add it as a Secret in your HF Space settings.")
 
     model = LiteLLMModel(
-        model_id="groq/llama-3.3-70b-versatile",
-        api_key=groq_api_key,
+        model_id="openai/gpt-4o-mini",
+        api_key=openai_api_key,
         temperature=0.0,
     )