codexia

Rust gateway that logs in with OpenAI Codex OAuth and exposes OpenAI- and Anthropic-compatible APIs.

Usage

cargo install codexia
codexia login
codexia config
codexia serve

login prints the Codex OAuth URL. Complete the login in a browser, then paste the full redirected URL from the browser address bar, for example http://localhost:1455/auth/callback?code=...&state=.... This matches OpenClaw's remote/headless fallback and does not require the gateway host to be reachable from the public internet.

OpenAI-compatible chat request:

curl http://127.0.0.1:14550/v1/chat/completions \
  -H 'content-type: application/json' \
  -d '{
    "model": "gpt-5.5",
    "messages": [{"role": "user", "content": "hello"}]
  }'

Anthropic-compatible Messages request:

curl http://127.0.0.1:14550/v1/messages \
  -H 'content-type: application/json' \
  -H 'x-api-key: local-secret' \
  -H 'anthropic-version: 2023-06-01' \
  -d '{
    "model": "gpt-5.5",
    "max_tokens": 1024,
    "messages": [{"role": "user", "content": "hello"}]
  }'

Claude Code / Anthropic SDK setup:

export ANTHROPIC_BASE_URL=http://127.0.0.1:14550
export ANTHROPIC_AUTH_TOKEN=local-secret
claude --model gpt-5.5

ANTHROPIC_BASE_URL should point at the Codexia server root, not /v1, because Anthropic clients append /v1/messages themselves. Streaming emits Anthropic-style message_delta stop_reason and cumulative usage.output_tokens.

Full Claude Code flow:

Start Codexia with a supported model list and a local API key:

codexia serve --bind 127.0.0.1:14550 --api-key local-secret

Point Claude Code at the local gateway:

export ANTHROPIC_BASE_URL=http://127.0.0.1:14550
export ANTHROPIC_AUTH_TOKEN=local-secret

Run Claude Code against a model that Codexia exposes:
```
claude --model gpt-5.5
```

For non-interactive validation, this works:

ANTHROPIC_BASE_URL=http://127.0.0.1:14550 \
ANTHROPIC_AUTH_TOKEN=local-secret \
claude -p --model gpt-5.5 "Reply with the single word OK"

Common pitfalls:

Do not set ANTHROPIC_BASE_URL to http://127.0.0.1:14550/v1; Claude Code appends /v1/messages itself.
Use a model that /v1/models actually returns, such as gpt-5.5. If Claude Code defaults to claude-sonnet-*, the request will fail because Codexia proxies Codex models, not Anthropic-hosted model IDs.
ANTHROPIC_AUTH_TOKEN is only the local gateway key configured with --api-key; it is not your upstream OpenAI/Codex OAuth token.
If you prefer a background service, install the daemon first and then point ANTHROPIC_BASE_URL at the daemon address instead of running codexia serve manually.

Optional local API key protection:

CODEXIA_API_KEY=local-secret codexia serve
curl http://127.0.0.1:14550/v1/models -H 'authorization: Bearer local-secret'

Interactive runtime configuration:

codexia config
codexia config show
codexia config reset

The config file is stored at ~/.codexia/config.json by default and is used as the fallback source for codexia serve and codexia daemon install.

Manually refresh the stored Codex OAuth token while the server is running:

curl -X POST http://127.0.0.1:14550/v1/auth/refresh \
  -H 'authorization: Bearer local-secret'

Check token expiry, account metadata, and available rate-limit windows:

codexia status

Fetch the same status data over HTTP:

curl http://127.0.0.1:14550/v1/status \
  -H 'authorization: Bearer local-secret'

Example response:

{
  "account_id": "acc_123",
  "token": {
    "expires_at": 1778098507,
    "remaining_seconds": 813427,
    "expires_at_local": "2026-05-05 12:15:07 +08:00"
  },
  "account": {
    "name": "Personal",
    "email": "user@example.com",
    "structure": "personal",
    "plan": "chatgptpro",
    "has_active_subscription": true,
    "subscription_expires_at": "2026-05-11T15:16:00+00:00",
    "subscription_expires_at_local": "2026-05-11 23:16:00 +08:00",
    "subscription_remaining_seconds": 1212345
  },
  "credits_balance": 0,
  "rate_limits": [
    {
      "name": "5h",
      "remaining_percent": 97.0,
      "reset_at": "1777297264",
      "reset_at_local": "2026-04-27 21:41:04 +08:00",
      "reset_in_seconds": 8658
    },
    {
      "name": "weekly",
      "remaining_percent": 68.0,
      "reset_at": "1777400385",
      "reset_at_local": "2026-04-29 02:19:45 +08:00",
      "reset_in_seconds": 111779
    }
  ],
  "warnings": []
}

Install Codexia as a per-user background daemon:

codexia daemon install
codexia daemon reinstall
codexia daemon start
codexia daemon restart
codexia daemon stop
codexia daemon uninstall

On macOS, Codexia installs a LaunchAgent at ~/Library/LaunchAgents/com.codexia.daemon.plist. On Linux, it installs a systemd user unit at ~/.config/systemd/user/codexia.service.

The daemon runs codexia serve with the options passed at install time:

codexia daemon install \
  --bind 127.0.0.1:14550 \
  --api-key local-secret

Models returned by /v1/models default to OpenClaw's openai-codex registry:

gpt-5.1
gpt-5.1-codex-max
gpt-5.1-codex-mini
gpt-5.2
gpt-5.2-codex
gpt-5.3-codex
gpt-5.3-codex-spark
gpt-5.4
gpt-5.4-mini
gpt-5.5
gpt-5.5-mini

Override or extend the list with CLI flags or environment variables:

codexia serve --models gpt-5.5,gpt-5.5-mini
CODEXIA_EXTRA_MODELS=my-model codexia serve
CODEXIA_MODELS_FILE=models.json codexia serve

models.json may be a JSON array or an object:

["gpt-5.5", "gpt-5.5-mini"]

{
  "models": ["gpt-5.5"],
  "extra_models": ["my-model"]
}

Credentials are stored at ~/.codexia/auth.json by default. Override with --auth-file, CODEXIA_AUTH_FILE, or CODEXIA_HOME.

Anthropic compatibility currently covers:

POST /v1/messages
POST /v1/messages/count_tokens
x-api-key or authorization: Bearer ... local auth
Anthropic-style SSE events for streaming text and tool use

The implementation intentionally follows Ollama's compatibility strategy where possible: Anthropic headers are accepted, locally configured auth is enforced, and unsupported advanced Anthropic-only features are ignored rather than rejected when possible.

The OAuth flow follows OpenClaw/pi-ai's Codex flow: PKCE, manual paste of the http://localhost:1455/auth/callback?... redirect URL, token exchange at https://auth.openai.com/oauth/token, and Codex requests to https://chatgpt.com/backend-api/codex/responses.

Disclaimer

Codexia is an unofficial tool and is not affiliated with, endorsed by, or supported by OpenAI. Use it at your own risk and make sure your usage complies with the terms that apply to your account and the upstream services.

License

Licensed under the GNU Lesser General Public License v3.0 only. See LICENSE.

codexia 0.2.1

codexia

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