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codex-for-claude-code

v0.2.6

Published

Run Claude Code against ChatGPT Codex via your Codex CLI OAuth.

Vulnerabilities

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Links

Git

Maintainers

yusangyusang

Keywords

claude-codecodexchatgptproxy

Readme

codex-for-claude-code

Run Claude Code against ChatGPT Codex using your existing Codex CLI subscription.

[!IMPORTANT] If you hit a 401 error, just launch the Codex CLI once (codex) to refresh the OAuth token, then rerun claude-codex.

Install

Requires Node.js ≥ 20, Claude Code, and a logged-in Codex CLI (codex login).

npm install -g codex-for-claude-code

How to run

claude-codex                      # launch Claude Code in Codex mode
claude-codex --resume my-session  # any extra args forward to `claude`

How it works

Claude Code TUI  ──►  codex-proxy :3099  ──►  chatgpt.com/backend-api/codex
                                (translates Anthropic ↔ Responses API,
                                 auth: Codex OAuth from ~/.codex/auth.json)

On each launch claude-codex:

  1. Reads ~/.codex/auth.json for your Codex OAuth token.
  2. Starts the local proxy on 127.0.0.1:3099 (if not already running).
  3. Uses an isolated Claude config dir ~/.claude-codex so Codex model-picker state cannot bleed into plain claude windows. Shared assets (settings.json, agents, commands, hooks, plugins) are symlinked from ~/.claude so there is still one source of truth for configuration.
  4. Writes Codex model options to ~/.claude-codex/.claude.json — Claude Code v2.1+ reads ${CLAUDE_CONFIG_DIR}/.claude.json (non-hashed) to populate the model picker.
  5. Spawns claude with ANTHROPIC_BASE_URL=http://127.0.0.1:3099 and CLAUDE_CONFIG_DIR=~/.claude-codex.

Claude model IDs (claude-*, opus, sonnet, haiku) pass through unchanged to api.anthropic.com. Only Codex IDs hit ChatGPT.

Troubleshooting

401 Unauthorized from ChatGPT backend OAuth token expired. Run codex once to refresh, then rerun claude-codex.

**No Codex auth: login via \codex` CLI** Run codex login. Verify ~/.codex/auth.jsoncontainstokens.access_token`.

Could not find Claude Code binary Install Claude Code, or set CLAUDE_CODEX_CLAUDE_BIN=/path/to/claude.

Model picker shows only Claude models Quit the TUI and relaunch claude-codex.

claude-codex --resume cannot see my plain Claude sessions Current builds keep session/history interoperability by symlinking shared Claude assets from ~/.claude into ~/.claude-codex. If plain claude sessions still do not appear, restart both TUIs so they reread the shared config tree.

Port 3099 in use pkill -f codex-proxy.mjs or set CODEX_PROXY_PORT=3199.

Requests hang / 502 curl http://127.0.0.1:3099/health. Next claude-codex run auto-restarts on version mismatch.

MIT © Yusang Park