Update chatbot_advisor.py

chatbot_advisor.py

@@ -6,6 +6,7 @@ from langgraph.graph.message import add_messages
 from langgraph.prebuilt import ToolNode, tools_condition
 from langchain_community.tools.tavily_search import TavilySearchResults
 from langchain_groq import ChatGroq
+from langchain_openai import ChatOpenAI
 from langchain_core.tools import tool
 from dotenv import load_dotenv
 import os
@@ -42,12 +43,19 @@ tools = [tavily_search]
 # LLM
 # =====================================================
 
-llm = ChatGroq(
+"""llm = ChatGroq(
     model="openai/gpt-oss-20b",
     streaming=True,
     temperature=0.3,
     api_key=os.getenv("GROQ_API_KEY")
 ).bind_tools(tools)
+"""
+llm=ChatOpenAI(
+    model="gpt-4.1-nano",
+    streaming=True,
+    temperature=0.3,
+    api_key=os.getenv("OPENAI_API_KEY")
+).bind_tools(tools)
 
 
 # =====================================================