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anthropic-proxy

by maxnowack

Pending

Proxy server that converts Anthropic API requests to OpenAI format and sends it to OpenRouter. It's used to use Claude Code with OpenRouter instead of the Anthropic API

395stars
33forks
JavaScript
Added 12/27/2025
View on GitHubDownload ZIP
API Integrationanthropicclaude-codellmopenrouter
Installation
# Add to your Claude Code skills
git clone https://github.com/maxnowack/anthropic-proxy
README.md

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 (required when using OpenRouter)
  • ANTHROPIC_PROXY_BASE_URL: Custom base URL for the transformed OpenAI-format message (default: openrouter.ai)
  • 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

Note: When ANTHROPIC_PROXY_BASE_URL is set to a custom URL, the OPENROUTER_API_KEY is not required.

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.