feat: opanai

agent.py

@@ -5,6 +5,7 @@ from langgraph.graph import START, StateGraph, MessagesState
 from langgraph.prebuilt import tools_condition
 from langgraph.prebuilt import ToolNode
 from langchain_google_genai import ChatGoogleGenerativeAI
+from langchain_openai import ChatOpenAI
 from langchain_groq import ChatGroq
 from langchain_huggingface import ChatHuggingFace, HuggingFaceEndpoint, HuggingFaceEmbeddings
 from langchain_community.tools.tavily_search import TavilySearchResults
@@ -158,6 +159,12 @@ def build_graph(provider: str = "groq"):
     if provider == "google":
         # Google Gemini
         llm = ChatGoogleGenerativeAI(model="gemini-2.0-flash", temperature=0)
+    elif provider == "openai":
+        # Groq https://console.groq.com/docs/models
+        llm =  ChatOpenAI(
+            model=os.environ.get("OPENAI_MODEL_NAME", "gpt-4o"),
+            temperature=0.0
+        )
     elif provider == "groq":
         # Groq https://console.groq.com/docs/models
         llm = ChatGroq(model="qwen-qwq-32b", temperature=0) # optional : qwen-qwq-32b gemma2-9b-it