154 lines
5.2 KiB
Markdown
154 lines
5.2 KiB
Markdown
# Claude Code but with OpenAI Models 🧙♂️🔄 ¯\\_(ツ)_/¯
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**Use Claude Code with OpenAI Models** 🤝
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A proxy server that lets you use Claude Code with OpenAI models like GPT-4o / gpt-4.5 and o3-mini. 🌉
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## Quick Start ⚡
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### Prerequisites
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- OpenAI API key 🔑
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### Setup 🛠️
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1. **Clone this repository**:
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```bash
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git clone https://github.com/1rgs/claude-code-openai.git
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cd claude-code-openai
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```
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2. **Install dependencies**:
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```bash
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pip install -r requirements.txt
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```
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*(Ensure `requirements.txt` includes FastAPI, Uvicorn, LiteLLM, python-dotenv, httpx)*
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3. **Configure Environment Variables**:
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Copy the example environment file:
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```bash
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cp .env.example .env
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```
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Edit `.env` and fill in your API keys and model configurations:
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* `ANTHROPIC_API_KEY`: (Optional) Needed only if proxying *to* Anthropic models.
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* `OPENAI_API_KEY`: Your OpenAI API key (Required if using OpenAI models as fallback or primary).
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* `GEMINI_API_KEY`: Your Google AI Studio (Gemini) API key (Required if using the default Gemini preference).
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* `PREFERRED_PROVIDER` (Optional): Set to `google` (default) or `openai`. This determines the primary backend for mapping `haiku`/`sonnet`.
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* `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`.
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* `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`.
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**Mapping Logic:**
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- 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.
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- Otherwise (if `PREFERRED_PROVIDER=openai` or the specified Google model isn't known), they map to `SMALL_MODEL`/`BIG_MODEL` prefixed with `openai/`.
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4. **Run the server**:
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```bash
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uvicorn server:app --host 0.0.0.0 --port 8082 --reload
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```
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### Using with Claude Code 🎮
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1. **Install Claude Code** (if you haven't already):
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```bash
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npm install -g @anthropic-ai/claude-code
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```
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2. **Connect to your proxy**:
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```bash
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ANTHROPIC_BASE_URL=http://localhost:8082 claude
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```
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3. **That's it!** Your Claude Code client will now use OpenAI models through the proxy. 🎯
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## Model Mapping 🗺️
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The proxy automatically maps Claude models to either OpenAI or Gemini models based on the configured model:
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| Claude Model | Default Mapping | When BIG_MODEL/SMALL_MODEL is a Gemini model |
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|--------------|--------------|---------------------------|
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| haiku | openai/gpt-4o-mini | gemini/[model-name] |
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| sonnet | openai/gpt-4o | gemini/[model-name] |
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### Supported Models
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#### OpenAI Models
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The following OpenAI models are supported with automatic `openai/` prefix handling:
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- o3-mini
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- o1
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- o1-mini
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- o1-pro
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- gpt-4.5-preview
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- gpt-4o
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- gpt-4o-audio-preview
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- chatgpt-4o-latest
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- gpt-4o-mini
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- gpt-4o-mini-audio-preview
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#### Gemini Models
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The following Gemini models are supported with automatic `gemini/` prefix handling:
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- gemini-2.5-pro-preview-03-25
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- gemini-2.0-flash
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### Model Prefix Handling
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The proxy automatically adds the appropriate prefix to model names:
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- OpenAI models get the `openai/` prefix
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- Gemini models get the `gemini/` prefix
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- The BIG_MODEL and SMALL_MODEL will get the appropriate prefix based on whether they're in the OpenAI or Gemini model lists
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For example:
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- `gpt-4o` becomes `openai/gpt-4o`
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- `gemini-2.5-pro-preview-03-25` becomes `gemini/gemini-2.5-pro-preview-03-25`
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- When BIG_MODEL is set to a Gemini model, Claude Sonnet will map to `gemini/[model-name]`
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### Customizing Model Mapping
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You can customize which models are used via environment variables:
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- `BIG_MODEL`: The model to use for Claude Sonnet models (default: "gpt-4o")
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- `SMALL_MODEL`: The model to use for Claude Haiku models (default: "gpt-4o-mini")
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Add these to your `.env` file to customize:
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```
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OPENAI_API_KEY=your-openai-key
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# For OpenAI models (default)
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BIG_MODEL=gpt-4o
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SMALL_MODEL=gpt-4o-mini
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# For Gemini models
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# BIG_MODEL=gemini-2.5-pro-preview-03-25
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# SMALL_MODEL=gemini-2.0-flash
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```
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Or set them directly when running the server:
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```bash
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# Using OpenAI models
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BIG_MODEL=gpt-4o SMALL_MODEL=gpt-4o-mini uv run uvicorn server:app --host 0.0.0.0 --port 8082
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# Using Gemini models
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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
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```
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To use a mix of OpenAI and Gemini models:
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```bash
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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
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```
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## How It Works 🧩
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This proxy works by:
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1. **Receiving requests** in Anthropic's API format 📥
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2. **Translating** the requests to OpenAI format via LiteLLM 🔄
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3. **Sending** the translated request to OpenAI 📤
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4. **Converting** the response back to Anthropic format 🔄
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5. **Returning** the formatted response to the client ✅
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The proxy handles both streaming and non-streaming responses, maintaining compatibility with all Claude clients. 🌊
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## Contributing 🤝
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Contributions are welcome! Please feel free to submit a Pull Request. 🎁
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