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anthropic-proxy

A proxy server that transforms Anthropic API requests to OpenAI format and sends it to openrouter.ai. This enables you to use Anthropic's API format while connecting to OpenAI-compatible endpoints.

Usage

With this command, you can start the proxy server with your OpenRouter API key on port 3000:

OPENROUTER_API_KEY=your-api-key npx anthropic-proxy

Environment variables:

  • OPENROUTER_API_KEY: Your OpenRouter API key
  • PORT: The port the proxy server should listen on (default: 3000)
  • REASONING_MODEL: The reasoning model to use (default: google/gemini-2.0-pro-exp-02-05:free)
  • COMPLETION_MODEL: The completion model to use (default: google/gemini-2.0-pro-exp-02-05:free)
  • DEBUG: Set to 1 to enable debug logging

Claude Code

To use the proxy server as a backend for Claude Code, you have to set the ANTHROPIC_BASE_URL to the URL of the proxy server:

ANTHROPIC_BASE_URL=http://0.0.0.0:3000 claude

License

Licensed under MIT license. Copyright (c) 2025 Max Nowack

Contributions

Contributions are welcome. Please open issues and/or file Pull Requests.