backend/llm.py

from langchain_openai import ChatOpenAI
import os


OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
if not OPENAI_API_KEY:
    raise RuntimeError("OPENAI_API_KEY is not set")

llm = ChatOpenAI(base_url="https://api.a4f.co/v1", model="provider-5/gpt-4o-mini")

def chatgpt(input):
    response = llm.invoke(input)
    return response.content