Antigravity CLI vs Gemini CLI
A migration guide: Gemini CLI's free Gemini Code Assist serving ended June 18, 2026, and Antigravity CLI is Google's successor terminal agent.
Updated August 28, 2026 · Independent comparison — Antigravity CLI, Gemini CLI are separate products.
Antigravity CLI
Google's terminal agent, successor to Gemini CLI
Antigravity CLI is Google's terminal coding agent and the successor to Gemini CLI. It is a proprietary preview that runs alongside the Antigravity IDE, sharing the same agent core, with multi-step reasoning, multi-file editing, and asynchronous multi-agent workflows by design, plus support for MCP, subagents, hooks, skills, and plugins. It became available to everyone on May 19, 2026, and on June 18, 2026 Google migrated free, Google AI Pro, and Google AI Ultra users to it from Gemini CLI. It runs on the Gemini model family, with limited non-Gemini models on a separate quota; there is no generic bring-your-own-key, and the weekly usage quota is the main throttle.
Gemini CLI
Google's open-source terminal coding agent
Gemini CLI is Google's open-source (Apache-2.0) terminal agent for coding, shell, file, and web tasks, with Gemini models governed by the Gemini terms of service. It offers MCP, extensions, built-in web fetch and search tools, a ReAct-style loop, a large 1M-token context, and GEMINI.md project instructions. The headline change: its free Gemini Code Assist serving reportedly ended June 18, 2026, folding consumer-plan users into Antigravity CLI, while Enterprise customers keep Gemini CLI through paid API keys and the Gemini Enterprise Agent Platform. The tool's source remains public on GitHub, so it can still be run with a Gemini API key or Vertex AI.
Bottom line
A migration guide: Gemini CLI's free Gemini Code Assist serving ended June 18, 2026, and Antigravity CLI is Google's successor terminal agent. Choose Antigravity CLI if you are on a Google AI Pro/Ultra or free plan — this is now Google's supported terminal agent; choose Gemini CLI if you want an Apache-2.0 open-source CLI you can inspect, fork, or self-host.
Access & Plans
| Feature | Antigravity CLI | Gemini CLI |
|---|---|---|
| Status | Current (from May 19, 2026) | Predecessor (open source, still runnable) |
| Consumer access | Free preview + Google AI Pro/Ultra | Free Code Assist serving ended June 18, 2026 |
| Enterprise access | Antigravity platform | Gemini API keys / Enterprise Agent Platform |
| API / usage billing | Plan limits + AI credits | Gemini API / Vertex AI usage-based |
| Account required | ✓ | ✓ |
Models & Providers
| Feature | Antigravity CLI | Gemini CLI |
|---|---|---|
| Primary model family | Gemini family | Gemini 3 Pro / Flash |
| Multi-vendor models | Limited non-Gemini (separate quota) | ✗ |
| Large context | Not stated | 1M-token context |
| Bring your own key | ✗ | Gemini API key / Vertex AI |
| In-session model switching | ✓ | Access-path dependent |
Agent Experience
| Feature | Antigravity CLI | Gemini CLI |
|---|---|---|
| Primary interface | Terminal (Go-based) | Terminal (ReAct loop) |
| Multi-agent / async work | Asynchronous multi-agent workflows | Single-agent loop |
| MCP support | ✓ | ✓ |
| Extensibility | Subagents, hooks, skills, plugins | Extensions, built-in tools |
| Headless / scriptable | ✓ | ✓ |
| Built-in web tools | Not stated | Web fetch / search |
Developer Workflow
| Feature | Antigravity CLI | Gemini CLI |
|---|---|---|
| Project instructions | Antigravity config | GEMINI.md |
| Shared desktop harness | Antigravity 2.0 desktop | ✗ |
| IDE / editor path | Antigravity desktop IDE | Code Assist (retired for consumers) |
| Relationship | Successor to Gemini CLI | Superseded for consumer plans |
| Migration path | Default going forward | Enterprise / self-host only |
Platforms & Openness
| Feature | Antigravity CLI | Gemini CLI |
|---|---|---|
| Client license | Not published | Open source (Apache-2.0) |
| Built in | Go | Node.js |
| Local OS support | macOS, Linux, Windows | macOS, Linux, Windows |
| Source availability | Not published | Public on GitHub |
| Vendor ecosystem | Google Antigravity | Google Gemini |
The Verdict
Choose Antigravity CLI if...
- ✓You are on a Google AI Pro/Ultra or free plan — this is now Google's supported terminal agent.
- ✓You want the newest, faster Go-based harness shared with the Antigravity 2.0 desktop.
- ✓You want asynchronous multi-agent workflows, subagents, hooks, skills, and plugins.
- ✓You want access to Gemini 3 plus the wider Antigravity model options.
- ✓You are starting fresh and want Google's forward-looking tool, not the retired one.
Choose Gemini CLI if...
- ✓You want an Apache-2.0 open-source CLI you can inspect, fork, or self-host.
- ✓You are an Enterprise customer keeping Gemini CLI via API keys or Vertex AI.
- ✓You rely on its 1M-token context and built-in web fetch and search tools.
- ✓You have existing GEMINI.md setups and extensions you do not want to migrate.
- ✓You want Gemini access through the Gemini API or Vertex without an Antigravity account.
Frequently Asked Questions
What is the difference between Antigravity CLI and Gemini CLI?
Antigravity CLI is Google's terminal coding agent and the successor to Gemini CLI. Gemini CLI is Google's open-source (Apache-2.0) terminal agent for coding, shell, file, and web tasks, with Gemini models governed by the Gemini terms of service.
Should I choose Antigravity CLI or Gemini CLI?
Choose Antigravity CLI if you are on a Google AI Pro/Ultra or free plan — this is now Google's supported terminal agent. Choose Gemini CLI if you want an Apache-2.0 open-source CLI you can inspect, fork, or self-host.
1DevToolRun both — and more
Weighing Antigravity CLI against Gemini CLI? 1DevTool is a multi-agent workspace that runs Antigravity CLI, Gemini CLI, Claude Code, Codex CLI, Cline, and OpenCode side by side in persistent terminals — bring your own keys or subscriptions, no lock-in. It adds a built-in HTTP client, 13-engine database client, and embedded browser, all wired into Send-to-AI. One-time $29, no subscription.