What it does This plugin authenticates Opencode against Antigravity — Google’s internal IDE — via standard Google OAuth. Once logged in, you can route requests through Antigravity’s rate limits instead of burning your own API keys, accessing models like Claude Opus 4.6 and Gemini 3.1 Pro that are normally locked behind Google’s IDE.

The interesting bit The dual-quota system is the real mechanic. The plugin juggles two separate Google quota pools — Antigravity and Gemini CLI — auto-falling back when one hits its limit. Add multiple Google accounts and it rotates between them automatically. It’s essentially load-balancing across free tiers you weren’t technically supposed to access from a CLI.

Key highlights

• Access to Claude Sonnet/Opus 4.6 and Gemini 3/3.1 Pro/Flash through Antigravity routing
• Multi-account OAuth with automatic rotation on rate-limiting
• Configurable “thinking” budgets for reasoning models (low to max variants)
• Google Search grounding toggle for Gemini models
• Auto-recovery for session errors and tool failures
• Works alongside other Opencode plugins (oh-my-opencode, dcp, etc.)

Caveats

• The README opens with a loud Terms of Service warning: using this violates Google’s ToS and users have reported banned or shadow-banned accounts
• Some Gemini CLI models require manual Google Cloud project setup; the default fallback project ID throws 403 permission errors
• Windows path handling changed after v1.3.x — old installs auto-migrate, new ones use ~/.config/opencode/

Verdict Worth a look if you’re already using Opencode and want to experiment with Google’s IDE-tier models without setting up billing. Skip it if you rely on your Google account for anything important, or if “may be suspended or permanently banned” makes you nervous.