pi-anthropic-oauth

Use Claude Pro/Max in Pi with browser OAuth.

Features

• Claude Pro/Max login from /login anthropic
• Automatic token refresh
• Claude Code-compatible OAuth headers and prompt shaping
• No API key or extra usage needed.
• Uses Pi's Anthropic model registry
• Adds Claude Opus 4.8 by default
• Auto-creates ~/.Claude Code → ~/.pi symlink when missing

Quick start

pi install npm:pi-anthropic-oauth

Start Pi, then run:

/login anthropic

Choose:

Claude Pro/Max

[!WARNING] Use at your own risk. This may go against Anthropic's terms.

[!NOTE] Anthropic auth changes are closely monitored for quick compatibility updates.

Extra models

To add another Anthropic model, create ~/.pi/agent/models.json:

{
  "providers": {
    "anthropic": {
      "baseUrl": "https://api.anthropic.com",
      "apiKey": "REQUIRED_BY_PI_FOR_CUSTOM_MODELS",
      "api": "anthropic-messages",
      "models": [
        {
          "id": "your-model-id",
          "name": "Your Model Name"
        }
      ]
    }
  }
}

[!NOTE] Pi requires baseUrl, apiKey, and api when defining custom models in models.json. With this extension, requests normally authenticate through Claude Pro/Max OAuth after /login anthropic, so apiKey is present to satisfy Pi's config requirements and does not need to be a valid Anthropic API key.

Troubleshooting

• Re-run /login anthropic if auth looks stale
• If local callback login does not complete, paste the final callback URL or code#state when prompted
• If something breaks, please open an issue with your Pi version, extension version, and error output

License

MIT