Verdict
Pick Antigravity CLI if you want to start for free or you already pay for Google AI. The free tier runs Gemini 4 Hydrogen, Google AI Pro at $19.99 adds Gemini 4 Argon and, on paid Pro, Claude Sonnet 5.5 and Opus 5.5 as well. It’s built for background multi-agent work and for remote SSH sessions, and agy acp puts it inside Zed, JetBrains, Android Studio or Xcode.
Pick Claude Code if you want published, predictable limits and a mature ecosystem of hooks, subagents, skills, GitHub review and CI integrations. Its limits are stated as multiples of the Pro plan, while Google doesn’t publish Antigravity’s numbers.
Privacy and compliance are the biggest gap. On personal Google accounts, Antigravity interactions are used to improve Google’s products and may be reviewed by people unless you turn off Telemetry. Google also says Antigravity in Gemini Enterprise doesn’t currently support SOC 2 or ISO 27001. Claude’s consumer plans train only if you allow it, and Anthropic’s commercial plans carry SOC 2 Type II and ISO certifications.
Watch the pace of change. Antigravity CLI ships almost daily, and recent releases changed defaults such as starting headless runs in Auto mode. Pin your settings if you script it.
Frequently asked questions
Is Antigravity CLI free?
Yes. The free tier includes Gemini 4 Hydrogen and Gemini 3.8 Flash with basic weekly limits. Claude Code has no free tier.
Can Antigravity CLI use Claude models?
Yes. Claude Sonnet 5.5 and Opus 5.5 are available on paid Google AI Pro (not trials), Ultra and Enterprise.
Which is better for enterprises?
Claude Code, on paper: Anthropic holds SOC 2 Type II and ISO certifications for its commercial plans and offers zero data retention to qualified Enterprise accounts. Google says Antigravity in Gemini Enterprise doesn't support SOC 2 or ISO 27001.