How do I install Antigravity CLI?

On macOS: brew install google/antigravity/antigravity-cli. On Linux: curl from antigravity.google/cli or use the platform-specific install scripts. On Windows: winget install Google.AntigravityCLI or download the installer from antigravity.google. After install, run 'antigravity auth login' to sign in with your Google account — your AI Pro or AI Ultra plan and quotas carry over automatically.

Is Antigravity CLI free?

Yes, the CLI itself is free to install. The cost is the underlying API usage. Free tier and AI Pro ($19.99/mo) users get standard quotas. The new AI Ultra $99.99/mo plan gives 5x higher Antigravity quotas with priority capacity, and AI Ultra $199.99/mo gives 20x. For pay-per-use, Gemini 3.5 Flash is $1.50 per 1M input tokens and $9 per 1M output tokens — among the cheapest frontier-class agent rates in May 2026.

Should I migrate from Gemini CLI to Antigravity CLI?

Yes, before June 18, 2026 if you're on the free tier, AI Pro, or AI Ultra. Google will stop serving requests from Gemini CLI and Gemini Code Assist IDE extensions for those tiers on that date. Enterprise customers can stay on Gemini CLI, but new features only ship to Antigravity CLI. Migration is easy: install Antigravity CLI, sign in with the same Google account, and run 'antigravity migrate' inside existing Gemini CLI projects to convert config layouts.

Quick Answer

What Is Antigravity CLI? Google's New Terminal Agent (May 2026)

Q: What is Antigravity CLI?

Antigravity CLI is Google's new terminal-native AI coding agent, launched at Google I/O 2026 on May 19, 2026. It's a Go-based command-line tool that runs on the same agent harness as Antigravity 2.0 (the desktop app), AI Studio, and Managed Agents in the Gemini API. Defaults to Gemini 3.5 Flash — Google's new frontier-class Flash-tier model with a 1,000,000-token context window. It replaces Gemini CLI, which is being deprecated for consumer use on June 18, 2026.

Published: May 21, 2026

What Is Antigravity CLI? Google’s New Terminal Agent (May 2026)

Antigravity CLI is Google’s new terminal AI agent, launched at Google I/O 2026 on May 19, 2026, replacing Gemini CLI. It’s the terminal surface of the Antigravity platform — same agent harness as the Antigravity 2.0 desktop app, AI Studio, and Managed Agents in the Gemini API.

Last verified: May 21, 2026

Quick facts

Property	Value
Released	May 19, 2026 (Google I/O 2026)
Vendor	Google
Implementation	Go binary
Default model	Gemini 3.5 Flash
Context window	1,000,000 tokens
Platforms	macOS, Linux, Windows
License	Closed source (binaries free to use)
Replaces	Gemini CLI (sunset June 18, 2026 for consumers)
Pricing	Free CLI; pay-per-token API; AI Pro / AI Ultra plans for higher quotas

What it does

Antigravity CLI is an agent, not an autocomplete. You give it a task — “refactor this auth module to use the new JWT library” — and it explores your codebase, plans the change, runs tools (file I/O, shell, git, MCP servers), and reports back.

Key capabilities:

Multi-agent manager view — spawn N agents on different tasks in parallel, review when they’re done
Subagents — agents can spawn child agents with their own context windows for sub-problems
Shared sessions with Antigravity 2.0 desktop — pick up where you left off in the GUI
MCP support — connect to your MCP servers, GitHub, Sentry, databases, etc.
Plugin system — install Antigravity plugins for vendor-specific integrations
Background tasks — schedule agents to run on cron or git triggers
SSH-style remote auth — run an agent on a remote machine but drive it from your laptop

Install and first run

macOS

brew install google/antigravity/antigravity-cli
antigravity auth login
cd ~/my-project
antigravity

Linux

curl -fsSL https://antigravity.google/cli/install.sh | sh
antigravity auth login

Windows

winget install Google.AntigravityCLI
antigravity auth login

After auth login, your existing Google AI Pro / Ultra plan and quotas are picked up automatically. No new keys to generate.

What’s different from Gemini CLI

Capability	Gemini CLI	Antigravity CLI
Default model	Gemini 3.1 Pro	Gemini 3.5 Flash
Multi-agent	Single agent	Parallel via manager view
Subagents	No	Yes
Shared session with desktop	No	Yes
Plugin system	Limited	Yes
Background / scheduled tasks	No	Yes
Implementation	TypeScript (Node)	Go (single binary)
Future development	Frozen	Active

How it works under the hood

Antigravity CLI ships as a single statically-linked Go binary — no Node runtime required. The agent harness is the same one powering the rest of the Antigravity product line: Antigravity 2.0 desktop, AI Studio, and Managed Agents in the Gemini API.

The harness handles:

Planning — breaking a task into a tree of subtasks
Tool calling — file I/O, shell, git, MCP servers, web fetch
Memory — per-session and (with opt-in) persistent project memory
Checkpointing — agent runs are resumable across crashes
Cost tracking — per-session token and dollar accounting

Configuration

Project-level config lives in .antigravity/config.toml:

[agent]
model = "gemini-3.5-flash"
fallback_models = ["gemini-3.1-pro"]
max_subagents = 8

[tools]
shell = true
git = true
github = true

[mcp.github]
command = "npx"
args = ["-y", "@modelcontextprotocol/server-github"]

User-level config in ~/.antigravity/config.toml.

Pricing

The CLI is free. You pay for model usage:

Plan	Antigravity capacity	Best for
Free Gemini	Low quota	Trying it
AI Pro $19.99	Standard quota	Daily but not heavy use
AI Ultra $99.99 (NEW)	5x Pro + priority	Full-day agentic coding
AI Ultra $199.99	20x Pro + priority	Heaviest users
Pay-per-token	No quota — billed per call	Variable workloads

Token rates for Gemini 3.5 Flash: $1.50 / 1M input and $9 / 1M output. Among the cheapest frontier-class rates available in May 2026.

Migrating from Gemini CLI

Steps:

brew install google/antigravity/antigravity-cli (or your platform’s equivalent)
antigravity auth login — uses your existing Google account
cd existing-gemini-cli-project && antigravity migrate — converts .gemini/config.json to .antigravity/config.toml
Your custom MCP servers continue to work unchanged
Before June 18, 2026 — Gemini CLI stops serving free, AI Pro, and AI Ultra users

Enterprise customers can stay on Gemini CLI past June 18 but new features only ship to Antigravity CLI.

Limits and caveats

Still very new — bugs and rough edges from week one. Expect rapid patch cadence.
Default model is Flash — fast and cheap but Gemini 3.1 Pro is still better on hard tasks. Switch with --model gemini-3.1-pro or set in config.
Closed source — unlike OpenAI’s Codex CLI (open source), the Antigravity CLI source is not public. The plugins API is documented but the harness internals aren’t.
Multi-agent is powerful but debug-heavy — running 8 agents in parallel produces 8 streams of output and overlapping diffs. The manager view helps; it’s still a behavior shift.

TL;DR

Antigravity CLI is what you should be running in your terminal by mid-June 2026 if you’re on the Google AI stack. It’s the Gemini CLI successor with a much better agent harness, multi-agent manager view, and Gemini 3.5 Flash as default. Free to install, $1.50/$9 per 1M tokens to run. Migrate before June 18 to avoid service interruption.