Antigravity CLI: closed source, Go rewrite, June 18 deadline

Source: Google Developers Blog Date: 2026-05-21 URL: https://developers.googleblog.com/an-important-update-transitioning-gemini-cli-to-antigravity-cli/

Summary

Google published migration guidance: Antigravity CLI is a Go rewrite (Gemini CLI was TypeScript/Node), is not open source (Gemini CLI was Apache 2.0), and Gemini CLI will stop serving requests for free and consumer tiers on June 18, 2026. Enterprise customers on Gemini Code Assist Standard/Enterprise licenses retain unchanged Gemini CLI access with continued model updates, bugs, and security fixes. The original Gemini CLI repo remains at google-gemini/gemini-cli under Apache 2.0.

Implications

• Agent landscape thread: The most significant open-source-to-closed transition in the CLI coding agent space. Gemini CLI was one of three Apache 2.0 CLI agents (alongside Codex and OpenCode). Antigravity reduces the open-source field. Community forks of Gemini CLI may emerge.
• Competitive positioning: Claude Code (proprietary), Codex (Apache 2.0), Antigravity (proprietary), OpenCode (MIT). The field splits: two open, two closed. Cursor remains closed.
• Enterprise thread: Enterprise customers are explicitly insulated — Gemini CLI with continued updates. The consumer tier absorbs the migration friction. This mirrors Anthropic’s enterprise-first strategy but inverts the approach (Anthropic kept the same product across tiers; Google built a new product for consumers and left the old one for enterprise).
• Migration timeline: 28 days from today. Plugins/extensions carry over as “Antigravity plugins.” Core capabilities (Skills, Hooks, Subagents) preserved.
• Architecture signal: Go rewrite suggests performance and deployment concerns — Go compiles to a single binary, no Node.js dependency. Aligns with the Rust/Go rewrite trend across developer tooling.