OpenAI to Claude API Converter Proxy

A local proxy server that converts OpenAI API format requests to Anthropic Claude API format.

Features

• Full API Conversion: Converts OpenAI chat completions to Claude Messages API
• Streaming Support: Real-time streaming responses
• Tool/Function Calling: Full support for function calling and tools
• Image Support: Handles base64 and URL-based images
• Model Passthrough: Unknown models pass through unchanged (use Claude models directly)
• Auto-Configuration: Generates config.json on first run

Quick Start

• Download the exe from the latest release, or build it yourself from the source.
• Double click to run it in the background, or place it inside of:

C:\Users\NAME\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup or C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup to run automatically on every system startup.

• The config will appear in the same directory, or alternatively in the current user's folder if there are no write permissions (eg. C:\Users\NAME\.openai-claude-proxy)

Build Executable (Windows)

# clone the repo (git required, or simply download the source code)
git clone https://github.com/Skillter/OpenAI-to-Claude-API-Converter-Proxy.git
cd OpenAI-to-Claude-API-Converter-Proxy
# build the exe (python required)
python build.py

Run from Source

git clone https://github.com/Skillter/OpenAI-to-Claude-API-Converter-Proxy.git
cd OpenAI-to-Claude-API-Converter-Proxy
python run.py

Last words

Feel free to open pull requests or an issue.

If you find this project useful, please consider giving it a star ⭐ or share it by the word of mouth. Those things help a lot. thanks.

Made with ❤️ by Skillter