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claudsor

v1.0.0

Published

OpenAI-compatible proxy for Anthropic Claude, designed to plug into Cursor as a custom OpenAI Base URL.

Vulnerabilities

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Links

Git

Maintainers

shotnothingshotnothing

Keywords

cursoranthropicclaudeopenaiproxyresponses-apichat-completions

Readme

claudsor

Use Cursor with Claude money.

Quickstart

Usage

No installation needed! Just run:

npx claudsor

A browser tab will open for Anthropic login. Paste the returned code back into the terminal.

anthropic auth callback

The terminal will then print something like

claudsor v0.3.0
  local:   http://localhost:5090
  tunnel:  https://grumpy-views-cross.loca.lt
  config:  ~\.claudsor

Paste into Cursor -> Settings -> Models -> OpenAI Base URL:
  https://grumpy-views-cross.loca.lt

Paste the URL (in this case https://grumpy-views-cross.loca.lt) into Cursor Settings → Models → API Keys → Override OpenAI Base URL (IMPORTANT: you need to be logged into a personal Cursor account, else enteprise privacy controls might disable this setting).

You also need to put in something in the OpenAI API Key field, but it can be anything.

cursor model settings

From there on, any model starting with gpt- will be routed to the server.

Congrats! 🎉

Model mapping

| Client model | Claude | | -------------------- | ----------------- | | gpt-*-codex | claude-opus-4-7 | | Anything else with gpt- | claude-sonnet-4-6 | | gpt-*-nano, gpt-*-mini | claude-haiku-4-5|

Developing Locally

git clone https://github.com/shotnothing/claudsor
cd claudsor
npm install
node index.js

Layout:

  • index.js : CLI entry, banner, shutdown
  • cli.js : arg parser
  • paths.js : resolves ~/.claudsor (token + logs)
  • auth.js : Anthropic OAuth + token refresh
  • claude.js : fetch wrapper for /v1/messages
  • translate.js : OpenAI <-> Anthropic translation (request + SSE)
  • server.js : HTTP server on --port
  • tunnel.js - localtunnel wrapper
  • logger.js : JSONL logs (input, output, errors, http)

Tail the logs to watch traffic:

tail -f ~/.claudsor/logs/input.jsonl
tail -f ~/.claudsor/logs/errors.jsonl