Gemini CLI vs Antigravity CLI (2026): pricing, limits and models compared

Gemini CLI compared with Antigravity CLI
	Gemini CLI	Antigravity CLI
Status	Maintained, but limited to paid Code Assist licences and legacy API keys since June 18, 2026.	Google's recommended terminal agent since May 19, 2026.
Who can use it	Gemini Code Assist Standard or Enterprise, Code Assist for GitHub on Google Cloud, or paid Gemini API / Vertex keys.	Anyone with a Google account, Google AI Plus, Pro or Ultra, or Google Cloud Business.
Free option	None.	Yes: Gemini 4 Hydrogen and Gemini 3.8 Flash with basic weekly limits.
Paid access	Code Assist hourly via Google Cloud (no new subscriptions since October 9, 2026), or Gemini API rates.	Google AI Pro $19.99 · Ultra $99.99 or $199.99 · Business from $30/seat or pay-as-you-go.
Models	Gemini models; the project says it isn't optimised for Gemini 4.	Gemini 4 Hydrogen, Argon and Carbon by plan, plus Claude Sonnet 5.5 and Opus 5.5 on paid tiers.
Open source	Yes (Apache 2.0).	No; the public repo holds docs, changelog and issues only.
Release pace	Stable and preview builds every Tuesday.	Almost daily; 1.5.0 to 1.5.9 in ten days in November.
Extensions and config	Extensions; MCP servers in ~/.gemini/settings.json.	Plugins (converted extensions); MCP servers in mcp_config.json; remote servers must use Streamable HTTP.
Wind-down dates	Code Assist annual renewals end after January 31, 2027; monthly after December 31, 2027.	None announced.

Verdict

For most people this isn’t a choice any more. Since June 18, 2026, Gemini CLI no longer works with personal Google accounts or Google AI Pro and Ultra, and those users were moved to Antigravity CLI. Gemini Code Assist, the paid plan that still includes Gemini CLI, stopped taking new subscriptions on October 9 and winds down through 2027.

Stay on Gemini CLI only if you have a Code Assist Standard or Enterprise licence, or a paid API or Vertex key, and you need what it offers: an open-source (Apache 2.0) agent you can inspect and fork, with a steady weekly release schedule. Google itself says it isn’t optimised for Gemini 4.

Move to Antigravity CLI for Gemini 4, a free tier, Claude models on paid plans, background multi-agent work and IDE integration through agy acp. The trade-offs are that it’s closed source, its weekly limits aren’t published, and on personal accounts Google uses your interactions to improve its products unless you turn off Telemetry.

Migration is mostly automatic. Run agy where your Gemini CLI setup lives and accept the onboarding checklist, then run agy plugin import gemini to convert extensions and move MCP servers. Your GEMINI.md files carry over unchanged. Two things to fix by hand: move workspace skills to .agents/skills/, and make sure remote MCP servers use Streamable HTTP, since older SSE servers aren’t supported.

Frequently asked questions

Should I switch from Gemini CLI to Antigravity CLI?

If you used Gemini CLI with a personal Google account or Google AI Pro/Ultra, you already have to: that access ended on June 18, 2026. If you're on a Code Assist licence, you can stay until it ends, but Code Assist isn't taking new subscriptions and Google recommends Antigravity for Gemini 4.

How do I migrate?

Install agy and run it in a folder with your Gemini CLI setup; it offers to convert extensions and settings. Then run agy plugin import gemini. GEMINI.md and AGENTS.md work unchanged; move workspace skills from .gemini/skills to .agents/skills and rename url or httpUrl to serverUrl for remote MCP servers.

What doesn't carry over?

Google says there isn't full feature parity, and custom terminal themes and experimental visual overlays aren't supported. Its guide doesn't say how hooks, subagents or other settings map, so check those by hand.

Is Antigravity CLI open source like Gemini CLI?

No. Gemini CLI is Apache 2.0; Antigravity CLI isn't open source.

Gemini CLI × Antigravity CLI

Verdict

Frequently asked questions

Sources