This project converts the API of Anthropic's Claude model to the OpenAI Chat API format.

• ✨ Call Claude API like OpenAI ChatGPT API
• 💦 Support streaming response
• 🐻 Support claude-instant-1, claude-2 models
• 🌩️ Deploy by Cloudflare Workers or Docker

You can run this project using Cloudflare Workers or Docker:

By using Cloudflare Workers, you don't need a server to deploy this project.

1. Create a Cloudflare Worker
2. Paste the code in cloudflare-worker.js to Cloudflare Worker "Quick Edit" Editor
3. Save and deploy
4. (Optional) Set custom domain for your Cloudflare Worker

The Cloudfalre Workers support 100k requests a day, If you need to call more than that, you can use Docker to deploy as below.

docker run -p 8000:8000 wtzeng/claude-to-chatgpt:latest

docker-compose up

The API will then be available at http://localhost:8000. API endpoint: /v1/chat/completions

When you input the model parameter as gpt-3.5-turbo or gpt-3.5-turbo-0613, it will be substituted with claude-instant-1. otherwise, claude-2 will be utilized.

Here are some recommended GUI software that supports this project:

• Bin-Huang/chatbox
• Yidadaa/ChatGPT-Next-Web

curl http://localhost:8000/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $CLAUDE_API_KEY" \
  -d '{
    "model": "gpt-3.5-turbo",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

The Claude Completion API has an endpoint /v1/complete which takes the following JSON request:

{
  "prompt": "\n\nHuman: Hello, AI.\n\nAssistant: ",
  "model": "claude-instant-1",
  "max_tokens_to_sample": 100,
  "temperature": 1,
  "stream": true
}

And returns JSON with choices and completions.

The OpenAI Chat API has a similar /v1/chat/completions endpoint which takes:

{
  "model": "gpt-3.5-turbo",
  "messages": [
    {
      "role": "user",
      "content": "Hello, AI."
    }
  ],
  "max_tokens": 100,
  "temperature": 1,
  "stream": true
}

And returns JSON with a response string.

This project converts between these two APIs, get completions from the Claude model and formatting them as OpenAI Chat responses.

This project is licensed under the MIT License - see the LICENSE file for details.