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Claude Code but with OpenAI Models 🧙‍♂️🔄 ¯\(ツ)/¯

Use Claude Code with OpenAI Models 🤝

A proxy server that lets you use Claude Code with OpenAI models like GPT-4o / gpt-4.5 and o3-mini. 🌉

Claude Code but with OpenAI Models

Quick Start ⚡

Prerequisites

  • OpenAI API key 🔑

Setup 🛠️

  1. Clone this repository:

    git clone https://github.com/1rgs/claude-code-openai.git
cd claude-code-openai

  2. Install dependencies:

    pip install -r requirements.txt

    (Ensure requirements.txt includes FastAPI, Uvicorn, LiteLLM, python-dotenv, httpx)

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

    cp .env.example .env

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

    • ANTHROPIC_API_KEY: (Optional) Needed only if proxying to Anthropic models.
    • OPENAI_API_KEY: Your OpenAI API key (Required if using OpenAI models as fallback or primary).
    • GEMINI_API_KEY: Your Google AI Studio (Gemini) API key (Required if using the default Gemini preference).
    • PREFERRED_PROVIDER (Optional): Set to google (default) or openai. This determines the primary backend for mapping haiku/sonnet.
    • BIG_MODEL (Optional): The model to map sonnet requests to. Defaults to gemini-1.5-pro-latest (if PREFERRED_PROVIDER=google and model is known) or gpt-4o.
    • SMALL_MODEL (Optional): The model to map haiku requests to. Defaults to gemini-1.5-flash-latest (if PREFERRED_PROVIDER=google and model is known) or gpt-4o-mini.

    Mapping Logic:

    • If PREFERRED_PROVIDER=google (default), haiku/sonnet map to SMALL_MODEL/BIG_MODEL prefixed with gemini/ if those models are in the server's known GEMINI_MODELS list.
    • Otherwise (if PREFERRED_PROVIDER=openai or the specified Google model isn't known), they map to SMALL_MODEL/BIG_MODEL prefixed with openai/.

  4. Run the server:

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

Using with Claude Code 🎮

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

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

  2. Connect to your proxy:

    ANTHROPIC_BASE_URL=http://localhost:8082 claude

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

Model Mapping 🗺️

The proxy automatically maps Claude models to either OpenAI or Gemini models based on the configured model:

Claude Model Default Mapping When BIG_MODEL/SMALL_MODEL is a Gemini model
haiku openai/gpt-4o-mini gemini/[model-name]
sonnet openai/gpt-4o gemini/[model-name]

Supported Models

OpenAI Models

The following OpenAI models are supported with automatic openai/ prefix handling:

  • o3-mini
  • o1
  • o1-mini
  • o1-pro
  • gpt-4.5-preview
  • gpt-4o
  • gpt-4o-audio-preview
  • chatgpt-4o-latest
  • gpt-4o-mini
  • gpt-4o-mini-audio-preview

Gemini Models

The following Gemini models are supported with automatic gemini/ prefix handling:

  • gemini-2.5-pro-preview-03-25
  • gemini-2.0-flash

Model Prefix Handling

The proxy automatically adds the appropriate prefix to model names:

  • OpenAI models get the openai/ prefix
  • Gemini models get the gemini/ prefix
  • The BIG_MODEL and SMALL_MODEL will get the appropriate prefix based on whether they're in the OpenAI or Gemini model lists

For example:

  • gpt-4o becomes openai/gpt-4o
  • gemini-2.5-pro-preview-03-25 becomes gemini/gemini-2.5-pro-preview-03-25
  • When BIG_MODEL is set to a Gemini model, Claude Sonnet will map to gemini/[model-name]

Customizing Model Mapping

You can customize which models are used via environment variables:

  • BIG_MODEL: The model to use for Claude Sonnet models (default: "gpt-4o")
  • SMALL_MODEL: The model to use for Claude Haiku models (default: "gpt-4o-mini")

Add these to your .env file to customize:

OPENAI_API_KEY=your-openai-key
# For OpenAI models (default)
BIG_MODEL=gpt-4o
SMALL_MODEL=gpt-4o-mini

# For Gemini models
# BIG_MODEL=gemini-2.5-pro-preview-03-25
# SMALL_MODEL=gemini-2.0-flash

Or set them directly when running the server:

# Using OpenAI models
BIG_MODEL=gpt-4o SMALL_MODEL=gpt-4o-mini uv run uvicorn server:app --host 0.0.0.0 --port 8082

# Using Gemini models
BIG_MODEL=gemini-2.5-pro-preview-03-25 SMALL_MODEL=gemini-2.0-flash uv run uvicorn server:app --host 0.0.0.0 --port 8082

To use a mix of OpenAI and Gemini models:

BIG_MODEL=gemini-2.5-pro-preview-03-25 SMALL_MODEL=gpt-4o-mini uv run uvicorn server:app --host 0.0.0.0 --port 8082

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. 🎁