Anthropic API Proxy for Gemini & OpenAI Models 🔄

Use Anthropic clients (like Claude Code) with Gemini, OpenAI, or direct Anthropic backends. 🤝

A proxy server that lets you use Anthropic clients with Gemini, OpenAI, or Anthropic models themselves (a transparent proxy of sorts), all via LiteLLM. 🌉

Quick Start ⚡

Prerequisites

• OpenAI API key 🔑
• Google AI Studio (Gemini) API key (if using Google provider) 🔑
• uv installed.

Setup 🛠️

From source

1. Clone this repository:

   git clone https://github.com/hangts/claude-code-proxy.git
   cd claude-code-proxy

2. Install uv (if you haven't already):

   curl -LsSf https://astral.sh/uv/install.sh | sh

   (uv will handle dependencies based on pyproject.toml when you run the server)

3. Configure Environment Variables: Copy the example environment file:

   cp .env.example .env

   Edit .env and fill in your API keys and model configurations:

   • ONEAPI_BASE_URL: (Optional) ONEAPI URL, default: http://oneapi.blockbeat.hk/v1
   • SAVING_MODEL: (Optional) Claude will automatically call the haiku (claude-haiku-4-5-20251001) model to perform simple tasks; replace it here, default: deepseek/deepseek-v3.2-exp
   • HEIGHT_MODEL: (Optional) Claude will automatically call the sonnet (claude-sonnet-4-5-20250929) model to perform tasks; replace it here, default: anthropic/claude-sonnet-4.5

4. Run the server:

   uv run uvicorn server:app --host 0.0.0.0 --port 8082 --reload

   (--reload is optional, for development)

Using with Claude Code 🎮

1. Install Claude Code (if you haven't already):

   npm install -g @anthropic-ai/claude-code

2. Claude Code Settings:

{
   "env": {
      "ANTHROPIC_BASE_URL": "{your proxy url}",
      "ANTHROPIC_AUTH_TOKEN": "{your oneapi auth token}",
      "ANTHROPIC_MODEL": "oneapi/{your model name}",
      "ANTHROPIC_SMALL_FAST_MODEL": "oneapi/{your model name}",
      "API_TIMEOUT_MS": "3000000",
      "CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC": "I"
   }
}

3. That's it! Your Claude Code client will now use the configured backend models through the proxy. 🎯

How It Works 🧩

This proxy works by:

1. Receiving requests in Anthropic's API format 📥
2. Translating the requests to OpenAI format via LiteLLM 🔄
3. Sending the translated request to OpenAI 📤
4. Converting the response back to Anthropic format 🔄
5. Returning the formatted response to the client ✅

The proxy handles both streaming and non-streaming responses, maintaining compatibility with all Claude clients. 🌊

Contributing 🤝

Contributions are welcome! Please feel free to submit a Pull Request. 🎁