llm_node.py

import os
from langchain_community.chat_models import ChatOpenAI

def llm_node(question, search_result):
    # Initialize GPT-4
    llm = ChatOpenAI(
        model="gpt-4",
        temperature=0,
        openai_api_key=os.getenv("OPENAI_API_KEY")
    )

    prompt = f"""You are solving a GAIA benchmark evaluation question.

Here’s the question:
{question}

Here’s retrieved information:
{search_result}

⚠️ VERY IMPORTANT:
- ONLY return the final answer, exactly as required.
- Do NOT include explanations, prefixes, or notes.
- If the question asks for a list, give only the list, in the requested format.

Your answer:"""

    response = llm.invoke(prompt)
    return response.content.strip()