BYOKEY

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BYOKEY

Bring Your Own Keys
Run ChatGPT.app / Codex and Claude clients through a local gateway.
Responses supports your ChatGPT subscription, GitHub Copilot and custom upstreams; Anthropic Messages supports Copilot, Cursor, Claude and custom upstreams.

 

 

 

BYOKEY is no longer archived. The Responses gateway and native Codex HTTP forwarding are available on master.
The latest published release, v3.0.0, does not include these features. Build from source to use the ChatGPT.app / Codex quick start.

Direct Copilot access is an alternative for Claude clients that only need Copilot. Its /v1/messages endpoint accepts Claude Code's requests without BYOKEY. The Cursor backend drives Cursor's private agent protocol, which Cursor does not allow outside its own clients, and it does not hold up in Claude Code's tool loops.
To use Copilot directly (GitHub does not document this endpoint), sign in with the GitHub CLI and configure:
Claude Code — ~/.claude/settings.json

Claude Desktop — third-party inference with the gateway provider. Copilot serves no /v1/models, so list the models by full id:

The Anthropic Messages path is shown below. Responses uses the same server with separate model routing.

Features

- Responses API — /v1/responses and /codex/responses for ChatGPT.app / Codex, with model aliases, custom upstreams, and Codex model discovery at /codex/models
- Native Codex HTTP forwarding — unmatched /codex/* paths go to the configured ChatGPT backend, including image generation and editing endpoints; no WebSocket support
- Anthropic Messages API — /v1/messages, /v1/messages/count_tokens and /v1/models, as Claude Code and Claude Desktop expect them; [1m] long-context ids included
- Copilot as a Claude backend — Copilot's Anthropic-format…