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

# later, update to the latest published release
codexia update

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 status
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.

On Linux, inspect the per-user service with:

codexia daemon status
systemctl --user status 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

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

OpenAI compatibility currently covers:

GET /v1/models
POST /v1/chat/completions
POST /v1/responses
POST /v1/responses/compact
POST /v1/responses/input_tokens

/v1/responses currently supports previous_response_id only as an in-memory continuation mechanism within the same running Codexia process. It is not exposed as a public retrievable/deletable response resource, and it should not be treated as durable storage across daemon restarts or process exits.

Anthropic compatibility currently covers:

GET /v1/models with an anthropic-version header
POST /v1/messages
POST /v1/messages/count_tokens
POST /v1/messages/batches
GET /v1/messages/batches
GET /v1/messages/batches/{batch_id}
POST /v1/messages/batches/{batch_id}/cancel
DELETE /v1/messages/batches/{batch_id}
GET /v1/messages/batches/{batch_id}/results
x-api-key or authorization: Bearer ... local auth
Anthropic-style SSE events for streaming text and tool use

Message batches execute asynchronously in a background task. Cancellation is best-effort at request boundaries inside the batch worker: requests that have already started are allowed to finish, while not-yet-started requests are marked as canceled.

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 0.4.1

codexia

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