LangChain (Python) with idapt

ChatOpenAI with base_url pointed at idapt: every catalog model behind one key.

Last reviewed 2026-07-17

Install

bash

pip install langchain-openai

Point it at idapt

python

from langchain_openai import ChatOpenAI

model = ChatOpenAI(
    model="anthropic/claude-sonnet-5",
    api_key=os.environ["IDAPT_API_KEY"],
    base_url="https://idapt.app/api/openai/v1",
)

Pitfalls

base_url, not openai_api_base

Recent langchain-openai versions take base_url directly; the legacy openai_api_base kwarg still works but is deprecated.

References

API keys and scopes
OpenAI-compatible API reference
Rate limits and errors

More quickstarts

LangChain (JS)OpenAI SDK (Python)LiteLLM