LangChain

import os
from langchain_anthropic import ChatAnthropic
from langchain_openai import ChatOpenAI

chat = ChatOpenAI(
    model="openai/gpt-6.1-sol",
    base_url="https://api.naga.ac/v1",
    api_key=os.environ["NAGA_API_KEY"],
    use_responses_api=True,
)
print(chat.invoke("Why do HTTP clients retry with backoff? One sentence.").text)

claude = ChatAnthropic(
    model="anthropic/claude-sonnet-5.5",
    base_url="https://api.naga.ac",
    api_key=os.environ["NAGA_API_KEY"],
)
print(claude.invoke("Why do HTTP clients retry with backoff? One sentence.").text)