from langchain_community.chat_models import ChatOpenAI

def llm_node(question):
    llm = ChatOpenAI(model="gpt-3.5-turbo", temperature=0)
    prompt = f"""You are solving a GAIA benchmark evaluation question.

⚠️ VERY IMPORTANT:
- ONLY return the final answer, exactly as required.
- DO NOT include explanations, prefixes, or notes.
- Format the answer exactly as asked (e.g., comma-separated, plural, in requested order).
- If the question asks for a list, give only the list, no intro.

Here’s the question:

{question}

Your direct answer:"""
    response = llm.invoke(prompt)
    return response.content.strip()