Antigravity adds Gemini 4 Hydrogen and Carbon to model selector

Antigravity v2.31.2 adds Gemini 4 Hydrogen, which provides fast coding and agentic execution across four reasoning effort levels and includes Orchestrator for dynamic multi‑model planning with Gemini 4 Carbon. The release also adds Gemini 4 Carbon to the model selector when signing in with Google Cloud application default credentials, selectable at low, medium, or high thinking levels. v2.31.1 fixes Gemini Enterprise sign‑in on Windows for Workforce Identity Federation accounts that could lose the selected license.

Official: https://antigravity.google/docs/changelog

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