Update agent.py

agent.py

@@ -158,7 +158,7 @@ def build_graph():
             
             # Initialize OpenAI LLM
             llm = ChatOpenAI(
-                model="gpt-3.5-turbo",  # You can change to "gpt-4" if you have access
+                model="gpt-4",  # You can change to "gpt-4" if you have access
                 temperature=0.1,
                 api_key=openai_api_key.strip(),
                 max_tokens=512