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anthropic-proxy
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 An…
git clone https://github.com/maxnowack/anthropic-proxy
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 to1to 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.
// compatibility
| Platforms | cli, api |
|---|---|
| Operating systems | — |
| AI compatibility | claude |
| License | — |
| Pricing | open-source |
| Language | JavaScript |
// faq
What is anthropic-proxy?
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. It is open-source on GitHub.
Is anthropic-proxy free to use?
anthropic-proxy is open-source, so it is free to use.
What category does anthropic-proxy belong to?
anthropic-proxy is listed under devtools in the Claudeers registry of Claude-compatible tools.
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[](https://claudeers.com/anthropic-proxy)
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[](https://claudeers.com/anthropic-proxy)
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