Triple Your Claude API Quota for Free with Antigravity Tools and cc-switch

Overview

This article explains a three‑step method to turn the free daily quota of Google One Pro into a standard API that ClaudeCode can consume, thereby tripling the usable Claude model quota while eliminating the monthly $20 subscription cost.

Step 1: Configure Antigravity Tools

Install the open‑source Antigravity Tools (also known as Antigravity Manager) and open its main interface. The dashboard lists all bound Google accounts, their package details, usage progress, and reset times.

Navigate to the API page to see which models each account supports:

Anthropic protocol – Claude Sonnet 4.6, Claude Opus 4.6 Thinking, etc.

Gemini protocol – Gemini 3 Pro High, Gemini 3 Pro Low.

OpenAI protocol – gpt‑4, gpt‑3.5‑turbo via automatic mapping.

Because the tutorial assumes you have ClaudeCode CLI installed, focus on the Anthropic protocol. Record the two key values shown on the API page:

base_url : e.g. http://127.0.0.1:8045 api_key : e.g.

sk-xxxxx

Step 2: Configure cc-switch

Open the cc-switch utility, which manages multiple API provider configurations for ClaudeCode, Codex, Gemini CLI, etc.

1. Add a new provider

Locate the “Claude” group and click the Add button to open a form.

2. Fill basic information

Enter a memorable provider name such as “Antigravity Tools”. Set the request address to the base_url obtained earlier and the API key to the recorded api_key.

3. Specify model details

Main model: claude-opus-4-6-thinking (most powerful)

Alternative (cost‑effective):

claude-sonnet-4-6

4. Activate the provider

Click the “Start” button; cc-switch writes the configuration into ClaudeCode’s config file.

Step 3: Verify the Integration

Open a terminal, navigate to your project directory, and run: claude In the interactive session, ask “Which model are you using now?” If the setup succeeded, Claude will reply with the model name you configured (e.g., claude-opus-4-6-thinking).

Optional: Cherry Studio for Multi‑Model Comparison

Cherry Studio is an open‑source cross‑platform AI desktop client that natively supports over 40 cloud models (OpenAI, Anthropic, Gemini, DeepSeek) and local models via Ollama or LM Studio. It lets you switch between Claude, GPT, Gemini, etc., in a single window and compare outputs.

Multi‑model aggregation

Unified configuration via a single API endpoint

300+ built‑in assistants for programming, writing, translation, and more

Local data storage with optional WebDAV backup for privacy

Why This Approach Is Attractive

Claude official subscription: $20/month, fixed quota.

Google One Pro: roughly $5/month, free quota three times larger and resets daily.

Thus the effective cost per Claude model usage drops to about one‑quarter of the official plan, with daily reset eliminating monthly limits.

Important Considerations

Compliance : The method uses legitimate API calls; no reverse‑engineering is involved.

Regional restrictions : Google may require the account region to be set outside China (e.g., United States or Hong Kong).

Multiple accounts : Antigravity Tools can bind several Google accounts and automatically rotate when one quota is exhausted.

Stability : The solution depends on third‑party services; if they become unavailable, consider alternative relays.

Summary

Cost reduction : Up to 75 % savings (≈ $180 per year) by leveraging Google One Pro.

Quota increase : Daily free quota is three times larger than Claude’s monthly allocation.

Seamless integration : One‑click configuration via cc‑switch makes the models instantly available in ClaudeCode CLI.