Key takeaways
- Announced at Google I/O on May 19, 2026 as the replacement for Gemini CLI, which stops serving free, Google AI Pro, and AI Ultra requests on June 18, 2026 — a one-month migration window
- Go-based and closed source, sharing the agent harness of the Antigravity 2.0 desktop platform; Google's I/O demo showed the platform spawning 93 subagents to build an operating-system core in roughly 12 hours
- Quotas are the flashpoint: launch users reported exhausting weekly limits in a couple of requests; Google has since given AI Pro/Ultra subscribers quotas that refresh every five hours, while the free tier stays weekly
FAQ
What is Antigravity CLI?
Antigravity CLI is Google's closed-source, Go-based terminal coding agent — the terminal surface of the Antigravity agent platform and the successor to Gemini CLI for individual users.
How much does Antigravity CLI cost?
It is available to everyone with a free tier (weekly rate limits) and higher limits via Google AI Pro and AI Ultra subscriptions, whose quotas refresh every five hours. Google has not published specific request counts per tier.
What models does Antigravity CLI use?
All tiers get Gemini 3 Pro, plus unlimited tab code completions and platform features like the Agent Manager and Browser integration.
How is Antigravity CLI different from Gemini CLI?
Gemini CLI is open source (Apache 2.0), Node-based, with daily quotas; Antigravity CLI is closed source, Go-based, multi-agent, with weekly/five-hour quota windows — and it lacks 1:1 feature parity at launch.
Executive Summary
Antigravity CLI is Google's closed-source, Go-based terminal coding agent, announced at Google I/O on May 19, 2026 as the successor to Gemini CLI for individual users. It is the terminal surface of Google Antigravity — the agent-first development platform Google launched in November 2025 — and shares the same agent harness as Antigravity 2.0, the desktop application unveiled alongside it.[1][2]
The transition is forced and fast: Gemini CLI stops serving free, Google AI Pro, and AI Ultra requests on June 18, 2026 — a one-month window — and Google concedes there "won't be 1:1 feature parity right out of the gate."[1][3] The headline capability is multi-agent orchestration (Google's I/O demo reportedly spawned 93 subagents to build an operating-system core in roughly 12 hours); the headline complaint is quotas, with launch users reporting weekly limits exhausted in a couple of requests.[4][3]
| Attribute | Value |
|---|---|
| Company | |
| Founded | 1998 (Antigravity platform: Nov 2025; CLI: May 2026) |
| Funding | Public company (GOOGL) |
| License | Proprietary (closed source) |
| Headquarters | Mountain View, CA |
Product Overview
Antigravity CLI (agy) brings the Antigravity agent harness to the terminal without the desktop app: a main agent decomposes complex tasks into subtasks and spawns parallel subagents with isolated contexts, with asynchronous background workflows for long-running jobs.[5][1] It carries forward Gemini CLI concepts — Agent Skills, Hooks, Subagents, and Extensions (renamed Antigravity plugins) — and is available to everyone as of May 19, 2026.[1]
The scale claim comes from Google's I/O 2026 demo, as described in third-party breakdowns: Antigravity 2.0 built the core framework of a working operating system in about 12 hours from a single prompt, launching 93 subagents across seven roles (including a non-coding Orchestrator, Critic, and Auditor), processing billions of tokens for under $1,000 in compute. That figure is a demo result, not a documented product limit.[4]
Key Capabilities
| Capability | Description |
|---|---|
| Multi-agent orchestration | Main agent spawns parallel subagents with isolated contexts[5] |
| Async background workflows | Long-running tasks continue while you keep working[1] |
| Agent Skills / Hooks / Plugins | Carried over from Gemini CLI (Extensions renamed plugins)[1] |
| Browser integration | Platform-level browser control; commenters' binary teardown reports an embedded browser runtime[6][7] |
| Gemini 3 Pro | Available to all tiers, with unlimited tab code completions[6] |
Product Surfaces
Antigravity 2.0 spans five surfaces; the CLI is one of them.[2]
| Surface | Description | Availability |
|---|---|---|
| Desktop app (Antigravity 2.0) | Agent-first IDE with Agent Manager | GA |
CLI (agy) | Terminal agent, same harness as desktop | GA (May 19, 2026) |
| SDK | Programmatic agent access | Announced |
| Managed Agents API | Hosted agent execution | Announced |
| Enterprise Platform | Org-level controls | Announced |
Technical Architecture
Installation: distributed as a prebuilt binary download — Hacker News commenters who inspected it describe a ~140 MB Go binary with embedded browser control, sandbox, Git, language detection, and a skills runtime. The GitHub repository contains only a changelog, readme, and a GIF — no source code.[7][3]
Key Technical Details
| Aspect | Detail |
|---|---|
| Deployment | Local CLI (single Go binary) |
| Model(s) | Gemini 3 Pro (all tiers)[6] |
| Integrations | Skills, hooks, subagents, plugins, browser integration[1] |
| Open Source | No — closed source[3] |
Internal architecture details — sandbox implementation, browser engine, agent scheduling — are not publicly disclosed; what's known comes from Google's announcements and community binary teardowns.[7]
Strengths
- Multi-agent orchestration by default — parallel subagents with isolated contexts, demonstrated at I/O scale (93 subagents in the OS-building demo)[5][4]
- Go-based performance — Google pitches it as "snappier and more responsive" than the Node-based Gemini CLI[1]
- One harness, many surfaces — same agent core as the Antigravity 2.0 desktop app[1]
- Gemini 3 Pro on every tier — including free, plus unlimited tab completions[6]
- Google's full backing — this is where Google's individual coding-agent investment now lives[1]
Cautions
- Closed source — the predecessor was Apache 2.0 with thousands of community PRs; the successor's repo holds a changelog and a GIF. Hacker News sentiment is deeply negative, framing the swap as a bait-and-switch[3][7]
- Quota backlash — launch-era GitHub issues include multiple reports of weekly quotas exhausted "with just a couple of requests"; Google itself warned the Ultra-only team-of-agents preview can consume an entire weekly quota mid-task[3][4]
- No 1:1 feature parity — Google's own admission; users specifically flag missing Agent Client Protocol (ACP) support and lost settings/extensions on migration[3][7]
- Launch instability — reports of sandboxing without DNS access, frequent "high traffic" errors, and credits burned on non-functional sessions[7]
- Forced one-month migration — Gemini CLI individual tiers go dark June 18, 2026, whether or not Antigravity CLI is ready for your workflow[1]
- Google product-longevity risk — the thread invoked killedbygoogle.com's 305+ dead projects; this tool exists because its predecessor was killed[7]
Pricing & Licensing
| Tier | Price | Includes |
|---|---|---|
| Free | $0 | Gemini 3 Pro, weekly rate limit, unlimited tab completions[6] |
| Google AI Pro | Subscription | Priority access; highest rate limits, quotas refresh every five hours[6] |
| Google AI Ultra | Subscription | Same five-hour refresh at higher limits; gated features like the team-of-agents preview[6][4] |
Specific request counts per tier are not publicly disclosed; Google says usage "is correlated with the 'work done' by the agent" — complex reasoning consumes more quota than simple tasks.[6]
Licensing model: Proprietary, closed source; bundled with Google AI consumer subscriptions[3]
Hidden costs: Quota opacity is the cost — agentic multi-step tasks can consume a disproportionate share of an undisclosed limit[6][3]
Competitive Positioning
Direct Competitors
| Competitor | Differentiation |
|---|---|
| Gemini CLI | Its open-source predecessor — daily quotas, ACP support, 105K+ stars; individual tiers sunset June 18, 2026 |
| Claude Code | Stable individual subscription path, open ecosystem of skills/hooks; no forced migration history |
| Codex | OpenAI's multi-surface platform with 4M+ weekly developers; bundled with ChatGPT plans |
| OpenCode | Model-agnostic and open source; Antigravity is Gemini-only and closed |
When to Choose Antigravity CLI Over Alternatives
- Choose Antigravity CLI when: You're committed to the Google ecosystem, want Gemini 3 Pro in the terminal with multi-agent orchestration, or are a Gemini CLI individual user with no other Google path after June 18, 2026
- Choose Claude Code when: You want a mature terminal agent with a stable individual plan and a track record of not sunsetting its users
- Choose Codex when: You're in the OpenAI ecosystem and want one agent across desktop, IDE, CLI, and web
- Choose Gemini CLI when: You hold a Gemini Code Assist Standard/Enterprise license — that path keeps the open-source tool alive
Ideal Customer Profile
Best fit:
- Google AI Pro/Ultra subscribers who want their subscription to cover a terminal coding agent
- Developers invested in the Antigravity desktop platform who want the same harness in the terminal
- Teams curious about aggressive multi-agent decomposition of large tasks
Poor fit:
- Developers who require open-source tooling or auditable internals
- Heavy users sensitive to opaque, work-correlated quotas
- Anyone burned by the Gemini CLI sunset who wants vendor-stability guarantees
Viability Assessment
| Factor | Assessment |
|---|---|
| Financial Health | Strong — Google has unlimited resources |
| Market Position | New entrant with a captive migration audience (Gemini CLI's individual user base)[1] |
| Innovation Pace | High — this is the focal point of Google's agent strategy, with a five-surface platform behind it[2] |
| Community/Ecosystem | Hostile start — closed source plus quota regression generated significant developer backlash[7][3] |
| Long-term Outlook | Likely durable as long as Antigravity remains Google's agent platform — but that's exactly the assurance Gemini CLI users thought they had |
Google has consolidated its individual coding-agent strategy on Antigravity, and the CLI inherits real platform investment: a shared harness, multi-agent orchestration, and Gemini 3 Pro on every tier. The open question is trust — Google launched this product by switching off a 105K-star open-source predecessor with one month's notice.[1][7]
Bottom Line
Antigravity CLI is technically ambitious — a Go-based terminal agent sharing a harness that demonstrably orchestrated 93 subagents to build an OS core — but it launched into a trust deficit of Google's own making: closed source, weekly quotas users burned through in a couple of requests, missing features, and a forced one-month migration off Gemini CLI.[4][3]
Google has already softened the sharpest edge, moving AI Pro/Ultra subscribers to quotas that refresh every five hours while the free tier stays weekly.[6] Whether that's enough to keep free-tier refugees from defecting to Claude Code, Codex, or open alternatives is the live question.
Recommended for: Google AI Pro/Ultra subscribers and Antigravity platform adopters who want Gemini 3 Pro multi-agent workflows in the terminal.
Not recommended for: Developers who need open-source tooling, predictable quotas, or insulation from Google's product-sunset history.
Outlook: The CLI will track the Antigravity platform's trajectory. Watch quota policy, feature-parity progress (especially ACP), and whether Google publishes any of the internals it closed off.[3][8]
Research by Ry Walker Research • methodology
Sources
- [1] Google Developers Blog: Transitioning Gemini CLI to Antigravity CLI
- [2] Digital Applied: Antigravity 2.0 — Google's Desktop AI Agent Deep Dive
- [3] The Register: Bye-bye, Gemini CLI
- [4] MCP.Directory: How 93 Agents Built an OS in 12 Hours — Antigravity 2.0 Demo Breakdown
- [5] DataCamp: Google Antigravity CLI — Orchestrating Parallel AI Agents
- [6] Google Blog: New Antigravity Rate Limits for Pro and Ultra Subscribers
- [7] Hacker News: Gemini CLI will stop working from June 18, 2026
- [8] Google Antigravity Website