Anthropic API compatible endpoint

[rohitsathish]

The current API works as an OpenAI compatible endpoint.

Would it be possible to release a Anthropic API compatible endpoint? This would allow us to hook it up with Claude Code, which would be perfect.

[righttang]

I can make this work with two proxy project working together
maybe someone can merge them.

First, current released version has a bug that tools using is not working very well, so need to use a branch from this pull request
#42

After this version running, you need to run another proxy that convert OpenAI compatiable version to Anthropic API version
https://github.com/ujisati/claude-code-provider-proxy

This project doesn't work out of box, you need to update main.py line 47 to following
base_url: str = "http://localhost:4142"
and .env file as following

ANTHROPIC_API_KEY="dummy-key" # Needed if proxying *to* Anthropic
OPENAI_API_KEY="dummy-key"  # Can be any value for local OpenAI-compatible APIs
GEMINI_API_KEY="dummy-key"

# OpenAI-Compatible API Configuration
OPENAI_API_BASE="http://localhost:4142"  # Your local OpenAI-compatible endpoint which points to copilot-api

# Optional: Provider Preference and Model Mapping
# Controls which provider (google or openai) is preferred for mapping haiku/sonnet.
# Defaults to openai if not set.
PREFERRED_PROVIDER="openai"

# Use models available on your local API (adjust these to match your available models)
BIG_MODEL="claude-sonnet-4"
SMALL_MODEL="claude-sonnet-4"

Then in your claude set

ANTHROPIC_API_KEY=abcd```
It works for me.

[ericc-ch]

Working on this btw! #44
Should be finished, but I haven't tested it yet

[ericc-ch]

IT WORKS!

[fondoger]

Thank you! I can't wait to give it a try. Will try it and post my feedback here.

[fondoger]

BWT, in README.md, you can mention this normal use case.

1. Install the VS Code plugin: Claude Code for VS Code

2. Add a .claude/settings.json with this settings:

   {
     "env": {
       "ANTHROPIC_BASE_URL": "http://localhost:4141",
       "ANTHROPIC_MODEL": "claude-4-sonnet",
       "ANTHROPIC_SMALL_FAST_MODEL": "gemini-2.0-flash-001"
     }
   }
   

3. Then you should be able to open claude code extension in VS Code directly. Claude code will automatically use VSCode's features to show code diff and other stuffs.

FYI: There is a list of supported environment variables for Claude Code: https://docs.anthropic.com/en/docs/claude-code/settings#environment-variables

[ericc-ch]

Nice, good to know those info. I'll add them to the readme
I didn't know there is a vscode extension for claude code