Claude Code Via Antigravity

Claude Code Free

Use Claude Code CLI for free through Google's Antigravity (Cloud Code Assist) subscription.
A lightweight local proxy that bridges Claude Code CLI ↔ Google Cloud Code Assist API, giving you access to Claude Opus 4.6 and Claude Sonnet 4.5 — no Anthropic API key needed.

How It Works

The proxy intercepts Claude Code CLI requests, translates them from Anthropic's format to Google's Cloud Code Assist API, and returns the responses in the format Claude Code expects. This works because Google's Antigravity/Code Assist subscription includes access to Claude models.

Prerequisites

- Node.js 18+ — Download
- Claude Code CLI — npm install -g @anthropic-ai/claude-code
- Google Account with Antigravity IDE Ultra or Google One AI Premium subscription

Quick Start

1. Clone the repo

2. Authenticate with Google

This opens your browser for Google OAuth. Sign in with the account that has the Antigravity/AI Premium subscription.

3. Launch Claude Code

Linux / macOS:

Windows (PowerShell):

Windows (double-click):
Just double-click start.bat

That's it! Claude Code CLI opens with full access to Claude models. 🚀

Available Models

All Claude Code model requests are automatically mapped to the best available model.

Platform Support

✅ Linux
Fully supported. Desktop shortcut included:

✅ macOS
Fully supported via start.sh. You can also create an Automator app for dock access.

✅ Windows
Fully supported via PowerShell (start.ps1) or batch file (start.bat).

Requirements:
- Node.js for Windows
- Claude Code CLI (npm install -g @anthropic-ai/claude-code)
- Windows Terminal recommended

Configuration

Environment Variables

Proxy Log

The proxy writes logs to a file instead of the terminal to keep Claude Code's UI clean:

- Linux/macOS:…