When does Gemini CLI stop working?

Gemini CLI stops serving requests on June 18, 2026 for Google AI Pro/Ultra and individual free-tier users. Google announced this on May 19, 2026 in a Developers Blog post. Enterprise Gemini CLI customers have a separate, longer migration timeline. After June 18, running 'gemini' in your terminal will return an error pointing you to migrate to Antigravity CLI.

What is the Antigravity CLI command?

The Antigravity CLI command is 'agy' (not 'gemini'). This is the primary breaking change in the migration. Any shell scripts, CI/CD pipelines, or aliases that call 'gemini' need to be updated to call 'agy'. Most flags and interactive workflows carry over, but you should verify your specific commands against the official Antigravity CLI documentation.

Do my Gemini CLI extensions still work in Antigravity CLI?

Extensions have been renamed to plugins in Antigravity CLI. The functionality is preserved but the configuration format and discovery paths may differ. Google's announcement confirmed that Extensions are now called Antigravity plugins, and a migration path exists. Check the official Antigravity CLI documentation for the updated plugin format and any changes to the configuration schema.

Does Antigravity CLI still have a 1M token context window?

Yes. Antigravity CLI retains the 1 million token context window that Gemini CLI was known for. The underlying Gemini 3.5 Flash and Pro models accessible through Antigravity support the same 1M-token context. This is one of Antigravity CLI's key advantages over Claude Code, which has a 200K token context window.

What happens to my Gemini CLI free tier?

The Gemini CLI free tier (1,000 requests/day with a Google account) ends with Gemini CLI on June 18, 2026. Antigravity CLI is tied to Google AI Pro and Ultra plans. The individual free-tier access path that Gemini CLI offered is not directly replicated in Antigravity — you need a Google AI Pro subscription (part of Google One AI Premium or a standalone plan) to use Antigravity CLI.

Can I use Antigravity CLI with amux?

Yes. amux manages any terminal agent session through tmux — Claude Code, Codex CLI, Aider, and now Antigravity CLI. You can run 'agy' sessions in amux-managed tmux windows alongside Claude Code sessions, track their output from the web dashboard, and coordinate tasks across agents using the shared kanban board. Just replace 'gemini' with 'agy' in your amux session launch commands.

What is Google Antigravity?

Google Antigravity 2.0 is Google's agent-first development platform, announced at Google I/O on May 19, 2026. It includes a VS Code fork (the Antigravity IDE), a CLI tool (agy), a Python/TypeScript SDK, Managed Agents in the Gemini API, and an Enterprise Agent Platform. Antigravity replaces Gemini CLI, Gemini Code Assist IDE extensions, and positions Google to compete directly with Claude Code and Cursor in the agentic coding market. It runs on Gemini 3.5 Flash with a 1M-token context window.

What is the difference between Gemini CLI and Claude Code?

Gemini CLI (now Antigravity CLI) and Claude Code are both terminal-native coding agents but differ in key dimensions: Antigravity CLI uses Gemini models with a 1M token context window; Claude Code uses Anthropic's Claude models (Opus 4.6) with a 200K context window. Antigravity CLI's free tier is ending; Claude Code has no free tier but Pro starts at $20/month. Claude Code scored 80.8% on SWE-bench Verified versus Gemini 3.1 Pro at 80.6% — near parity for agentic coding tasks. Both support hooks, subagents, and multi-agent orchestration. amux can run both in parallel from one dashboard.

Gemini CLI Is Ending June 18: Complete Migration Guide to Antigravity CLI

Q: What is replacing Gemini CLI?

Google is replacing Gemini CLI with Antigravity CLI — a terminal-native coding agent that is part of the broader Google Antigravity 2.0 platform. The CLI command changes from 'gemini' to 'agy'. Antigravity CLI has been available to all users since May 19, 2026, and Gemini CLI stops serving requests on June 18, 2026 for Google AI Pro, Ultra, and free-tier users. Enterprise customers have a longer migration window.

Q: Is Antigravity CLI open source?

No. Antigravity CLI is not open source, unlike Gemini CLI which was available under the Apache 2.0 license on GitHub. Google positioned the switch to Antigravity as a move to a 'premier agent-first development platform' — a more enterprise-grade offering that does not carry the open-source license of its predecessor.

Gemini CLI stops serving requests on June 18, 2026. Google announced the transition to Antigravity CLI (agy) on May 19 — here is everything you need to migrate before the deadline.

⚠️

Deadline: June 18, 2026. Gemini CLI (gemini command) stops responding for Google AI Pro, Ultra, and individual free-tier users. Enterprise customers have a separate extended timeline. The new command is agy. Antigravity CLI has been GA since May 19, 2026.

TL;DR: Replace gemini with agy in all scripts and aliases. Your Hooks, Subagents, and Agent Skills migrate unchanged. Extensions are now called plugins. The free tier (1,000 req/day) ends — Antigravity requires a Google AI Pro subscription. Gemini CLI was Apache 2.0 open source; Antigravity CLI is not. The 1M token context window is retained.

What Happened to Gemini CLI

Gemini CLI launched in mid-2025 as a free, open-source terminal coding agent powered by Gemini 2.5 Pro. It was notable for two things that set it apart from Claude Code and Codex CLI: a genuinely generous free tier (1,000 requests/day with a Google account) and a 1 million token context window — five times larger than Claude Code's 200K limit.

On May 19, 2026, at Google I/O 2026, Google announced Antigravity 2.0 — a full agent-first development platform to compete directly with Cursor and Claude Code. The platform includes a VS Code fork (the Antigravity IDE), the Antigravity CLI (agy), an SDK, and Managed Agents in the Gemini API.

Google's message to Gemini CLI users in the transition announcement was direct: "your workflows have simply outgrown those early days of 2025." Gemini CLI was reframed as an early experiment; Antigravity CLI is positioned as the production-grade successor and Google's "premier agent-first development platform."

June 18 Deadline: What Stops Working

On June 18, 2026, Gemini CLI stops serving requests for the following user groups:

Google AI Pro subscribers (formerly Google One AI Premium) — must migrate to Antigravity CLI
Google AI Ultra subscribers — must migrate to Antigravity CLI
Individual free-tier users (1,000 req/day Google account login) — must migrate to a paid Google AI plan and Antigravity CLI

Enterprise timeline is different. Enterprise Gemini Code Assist customers (Standard and Enterprise tiers) have a separate, longer migration window. If your organization uses Gemini CLI through Vertex AI or enterprise contracts, contact your Google account team for your specific deadline.

After June 18, running gemini in your terminal will fail. If you have shell scripts, GitHub Actions, CI/CD pipelines, MCP configurations, or tmux session launchers that call gemini, they will break. The migration window is short — audit your toolchain now.

What Changes in Antigravity CLI

Dimension	Gemini CLI (old)	Antigravity CLI (new)
CLI command	`gemini`	`agy`
Extensions	Extensions (`~/.gemini/extensions/`)	Plugins (renamed, new path)
Open source	✔ Apache 2.0 (GitHub)	✘ Closed source
Free tier	1,000 req/day (Google account)	Requires Google AI Pro/Ultra plan
Underlying model	Gemini 2.5 Pro / Flash	Gemini 3.5 Flash / Pro
IDE integration	Gemini Code Assist (VS Code extension)	Antigravity IDE (VS Code fork)
Config directory	`~/.gemini/`	`~/.antigravity/` (verify against docs)
Custom commands	`~/.gemini/commands/*.toml`	Updated format (see docs)

The most disruptive change for most developers is the CLI command rename from gemini to agy. This is a one-line find-and-replace in most scripts, but it will break any automation that calls the old binary name.

What Stays the Same

Google confirmed that the following Gemini CLI capabilities are fully retained in Antigravity CLI:

Feature	Status in Antigravity CLI
Agent Skills	✔ Fully retained, same format
Hooks	✔ Fully retained, same format
Subagents	✔ Fully retained, same orchestration model
1M token context window	✔ Retained (Gemini 3.5 models)
Multi-turn interactive sessions	✔ Same interactive workflow
File injection (`@` prefix)	✔ Retained
Shell passthrough (`!` prefix)	✔ Retained
Slash commands	✔ Retained (verify specific commands)

Google explicitly noted that "there won't be a 1:1 feature parity on day one" — some Gemini CLI-specific features may arrive in Antigravity CLI in later releases. Check the official transition announcement and Antigravity CLI docs for the current feature parity table.

Step-by-Step Migration Guide

1Install Antigravity CLI

Antigravity CLI has been available to all users since May 19, 2026. Install it via the official installer or your package manager:

# macOS (Homebrew)
brew install google-antigravity/tap/agy

# Linux (direct install)
curl -fsSL https://dl.antigravity.google/install.sh | sh

# Verify installation
agy --version

See the official installation docs for the latest method — install paths may change before June 18.

2Authenticate with your Google AI account

Antigravity CLI requires a Google AI Pro or Ultra subscription (the individual free tier ended with Gemini CLI). Sign in to link your account:

# Interactive login
agy auth login

# Verify your session
agy auth status

If you don't have a Google AI Pro subscription, you'll need to sign up at ai.google before proceeding.

3Update shell scripts and aliases

This is the most critical step. Find every occurrence of the gemini command across your scripts, aliases, and CI/CD configs:

# Find all scripts calling 'gemini'
grep -r "gemini" ~/.zshrc ~/.bashrc ~/.profile ~/scripts/ .github/ 2>/dev/null

# Bulk replace in scripts (macOS)
find ~/scripts -name "*.sh" -exec sed -i '' 's/\bgemini\b/agy/g' {} +

# Update shell aliases
# Change: alias g='gemini'
# To:     alias g='agy'

Also check: GitHub Actions workflows, Makefile targets, Dockerfile RUN commands, and any cron jobs that invoke Gemini CLI.

4Migrate Extensions to Plugins

Gemini CLI Extensions are now called Plugins in Antigravity CLI. The extension directory and configuration format have changed. For each extension you used:

# Gemini CLI (old)
ls ~/.gemini/extensions/

# Antigravity CLI (new) — verify exact path in docs
ls ~/.antigravity/plugins/

Check the Antigravity CLI plugins documentation for the updated manifest format. Simple extensions (no binary dependencies) typically migrate by renaming the config file; complex extensions may need updates.

5Migrate custom TOML commands

If you used Gemini CLI's custom command feature (~/.gemini/commands/*.toml, released July 2025), verify the new path and format for Antigravity CLI:

# Gemini CLI custom commands (old)
ls ~/.gemini/commands/

# Move and verify format
# Check: https://antigravity.google/docs/cli/commands

The TOML-based command format may have been updated. Test each custom command interactively with agy after copying.

6Test your core workflows

Validate that your most-used workflows function in Antigravity CLI before the June 18 deadline:

# Test interactive session
agy

# Test non-interactive (headless) mode
agy -p "Summarize the changes in the last 5 commits"

# Test with file injection
agy -p "Review this file" @src/main.py

# Test subagent invocation (if you use them)
agy --agent-skills

Run this at least a week before June 18 so you have time to troubleshoot any edge cases.

7Update amux session configs (if applicable)

If you manage Gemini CLI sessions through amux, update your session launch commands to use agy:

# Old amux session launch
tmux new-session -s gemini-agent -d 'gemini -p "work on feature branch"'

# New amux session launch
tmux new-session -s antigravity-agent -d 'agy -p "work on feature branch"'

See Running Antigravity CLI with amux below for more on managing Antigravity sessions alongside Claude Code.

Pricing Changes

The pricing model change is one of the most significant shifts in the transition. Gemini CLI was unusually generous for a production-grade AI tool: 1,000 requests per day at no cost with a standard Google account login (via OAuth), giving access to Gemini 2.5 Pro at zero marginal cost. This drew significant adoption from developers who found Claude Code's $20/month minimum too expensive for exploration.

Antigravity CLI requires a Google AI Pro or Ultra subscription:

Plan	CLI Access	Models	Price
Individual free tier	✘ Ends June 18 with Gemini CLI	—	$0
Google AI Pro	✔ Antigravity CLI included	Gemini 3.5 Flash / Pro	~$20/mo
Google AI Ultra	✔ Antigravity CLI included	Gemini 3.5 Pro (higher limits)	~$100–200/mo
Gemini API (pay-as-you-go)	✔ Via API key	Gemini 3.5 Flash / Pro	Per token (see ai.google.dev/pricing)
Enterprise (Vertex AI)	✔ Separate timeline	All Gemini models	Enterprise contract

Developers who relied on Gemini CLI's free tier face the biggest disruption. A Google AI Pro subscription ($20/month) brings pricing in line with Claude Code Pro ($20/month). Developers evaluating both should read the AI Coding Tools Comparison for a full cost analysis.

Comparison: Gemini CLI vs Antigravity CLI vs Claude Code

With Gemini CLI ending and Antigravity CLI launching, many developers are re-evaluating their terminal coding agent. Here is how the three main options compare as of June 2026:

Feature	Gemini CLI (ending Jun 18)	Antigravity CLI (successor)	Claude Code (Anthropic)
CLI command	`gemini`	`agy`	`claude`
Underlying model	Gemini 2.5 Pro	Gemini 3.5 Flash/Pro	Claude Opus 4.6
Context window	1M tokens	1M tokens	200K tokens
Free tier	1,000 req/day	None (Pro required)	None (Pro required)
Starting price	$0 (ending)	~$20/mo (Google AI Pro)	$20/mo (Claude Pro)
Open source	✔ Apache 2.0	✘ Closed source	✘ Closed source
Hooks	✔	✔	✔ (CLAUDE.md + hooks)
Subagents	✔	✔	✔ (Agent SDK)
Extensions/Plugins	✔ Extensions	✔ Plugins	✔ MCP servers
SWE-bench Verified	~80.6% (Gemini 3.1 Pro)	~80.6%+ (Gemini 3.5)	~80.8%
IDE integration	Gemini Code Assist	Antigravity IDE	Cursor, VS Code
Multi-session mgmt	Manual tmux	Manual tmux	amux, Claude Squad

The practical coding performance between Antigravity CLI and Claude Code is close — Anthropic's Claude Opus 4.6 scores approximately 80.8% on SWE-bench Verified versus Gemini 3.1 Pro at approximately 80.6%, a gap well within noise. The differentiators are elsewhere: Antigravity's 1M context window gives it a structural advantage for large codebases; Claude Code's ecosystem (MCP servers, hooks, session managers, Agent SDK) gives it an orchestration edge.

Running Antigravity CLI with amux

amux is an open-source control plane for managing multiple AI coding agent sessions from a single web dashboard. It works with any terminal-based agent — including Antigravity CLI. If you run Antigravity sessions alongside Claude Code sessions, amux coordinates them through shared tmux windows.

amux is agent-agnostic. The web dashboard, kanban board, REST API, self-healing watchdog, and inter-session messaging all work with any process running in a tmux session. Replacing gemini with agy in your amux session launch commands is all that is required.

To launch an Antigravity CLI session via amux:

# Install amux (if not already installed)
pip install amux

# Launch amux server
amux serve &

# Create a new Antigravity CLI session
# In the amux web dashboard or via REST API:
# POST /api/sessions { "name": "agy-worker-1", "command": "agy" }

# Or create via tmux directly (amux picks it up)
tmux new-session -s agy-worker-1 -d 'agy'

# Assign it a task via the amux kanban board
# and monitor output in the web dashboard at http://localhost:8822

With amux, you can run 5–20 Antigravity CLI agents in parallel, assign them tasks from a shared board, inspect their output without switching terminals, and set up a self-healing watchdog to restart crashed sessions automatically. See the getting started guide or GitHub repo for setup instructions.

Frequently Asked Questions

What is replacing Gemini CLI?+

Google is replacing Gemini CLI with Antigravity CLI — the terminal component of the Google Antigravity 2.0 platform. The CLI command changes from gemini to agy. Antigravity CLI has been available to all users since May 19, 2026, and Gemini CLI stops serving requests on June 18, 2026 for Google AI Pro, Ultra, and free-tier users.

When exactly does Gemini CLI stop working?+

June 18, 2026 for Google AI Pro/Ultra and individual free-tier users. Enterprise Gemini Code Assist customers have a separate, longer migration window. The official Google announcement was made on May 19, 2026.

Is Antigravity CLI open source like Gemini CLI was?+

No. Gemini CLI was available under the Apache 2.0 license on GitHub, making it fully forkable and self-hostable. Antigravity CLI is a closed-source product tied to Google AI subscriptions. This is a significant shift that affects developers who value open-source tooling or who ran Gemini CLI on private infrastructure without sending traffic to Google's API.

What happens to the free tier (1,000 req/day)?+

The Gemini CLI free tier (1,000 requests/day with a Google account via OAuth) ends on June 18, 2026. Antigravity CLI requires a Google AI Pro subscription (approximately $20/month). There is no equivalent free tier in Antigravity CLI. Developers who used Gemini CLI specifically for its free access will need to pay for a subscription or evaluate alternatives like Aider (fully open source, bring your own API key) or Codex CLI.

Do my Gemini CLI Hooks still work in Antigravity CLI?+

Yes. Google confirmed that Hooks are fully retained in Antigravity CLI. Agent Skills and Subagents are also retained. Extensions are renamed to Plugins and the configuration path may differ — check the Antigravity CLI plugins documentation to verify your extension format is compatible.

Should I switch to Claude Code instead of Antigravity CLI?+

It depends on your priorities. Antigravity CLI retains the 1M token context window, which matters for large monorepos or long-running sessions. Claude Code has a richer orchestration ecosystem — MCP servers, hooks, the Agent SDK, and multi-session tools like amux and Claude Squad. SWE-bench scores are near parity (~80.8% vs ~80.6%). Both cost around $20/month at the entry tier. If the Antigravity migration is smooth, many developers will stay; if the free tier loss or closed-source shift is a dealbreaker, now is a natural switching point. See the full AI Coding Tools Comparison for more.

What is the new Antigravity CLI command?+

The new command is agy — replacing gemini. This is the core breaking change in the migration. Update all shell scripts, aliases, CI/CD configurations, and automation that calls gemini to call agy instead. Most workflows are otherwise compatible.

Orchestrate Antigravity CLI alongside Claude Code

amux is a free, open-source control plane for running multiple AI coding agent sessions in parallel — including Antigravity CLI. Web dashboard, self-healing watchdog, kanban board, mobile app.

View on GitHub Getting Started Guide