Antigravity CLI 1.5.8 adds Gemini 4 Hydrogen and Carbon, with two security fixes

What changed

Gemini 4 Hydrogen (effort Low to XHigh) and Carbon (Low to High) are available with a Gemini API key; Hydrogen also works with application default credentials and enterprise gateways. The release fixes a sandbox network-proxy bypass using encoded slashes, backslashes or .. in URL paths, and Windows always-allow rule bypasses through cmd or PowerShell. Google launched Hydrogen and the Orchestrator planner in the Antigravity app the day before.

Who it affects

Antigravity CLI users with API keys, application default credentials or enterprise gateways.

What to do

Update to 1.5.8 or later, and pick the new models with /model or agy --model.

Source: https://github.com/google-antigravity/antigravity-cli/releases