5 people 6c2b70e60e feat(openai): add ChatGPT OAuth-backed ChatOpenAICodex chat model (#37569) ...

[Docs](https://github.com/langchain-ai/docs/pull/4115)

Adds a new `ChatOpenAICodex` chat model and a small `chatgpt_oauth`
module so users can authenticate with their ChatGPT subscription (OAuth
2.0 Authorization Code Flow with PKCE) and route Responses-API requests
to the ChatGPT Codex backend at `https://chatgpt.com/backend-api/codex`.
Login and token persistence live behind a refresh-aware
`ChatGPTOAuthTokenProvider` protocol so they stay decoupled from model
invocation. The existing API-key `ChatOpenAI` behavior is untouched. By
default the file-backed provider writes to
`~/.langchain/chatgpt-auth.json` to avoid stomping on Codex CLI / VS
Code sessions at `~/.codex/auth.json`. No new required dependencies are
introduced (uses stdlib + `httpx`).

```python
from langchain_openai import ChatOpenAICodex
from langchain_openai.chatgpt_oauth import login_chatgpt

login_chatgpt()
model = ChatOpenAICodex(model="gpt-5.5")
response = model.invoke("hello")
```

_Opened collaboratively by Mason Daugherty and open-swe._

---------

Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>
Co-authored-by: Mason Daugherty <61371264+mdrxy@users.noreply.github.com>
Co-authored-by: Mason Daugherty <github@mdrxy.com>
Co-authored-by: Mason Daugherty <mason@langchain.dev>

2026-06-12 21:49:03 -04:00

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