Antigravity
Google's agent-first AI coding platform built around Gemini 3, the successor to Gemini CLI. Delivered as a heavily modified VS Code-based IDE (Editor and Manager views, built-in browser/terminal) and also supports terminal interaction via the `gemini` CLI. Features autonomous agents with multi-step edit/run/verify capabilities and verifiable Artifacts (plans, screenshots, recordings). Also supports Claude 5 (Fable), Claude Sonnet 4.6, Claude Opus 4.6, and GPT-OSS-120B. Intro