Gemini CLI vs Claude Code (2026): What to Use Before June 18
Google retires Gemini CLI on June 18, 2026. How it compares to Claude Code on price, models, and limits, and what to actually run next.
Google is retiring Gemini CLI on June 18, 2026, eleven days from now, and pushing everyone to a new tool called Antigravity CLI. So the real question is not which of these two terminal agents codes better today. It is what you should be running next week.
The 30-second verdict
Pick Claude Code if you want the most reliable paid coding agent and you will spend $20 a month or more to get it. It runs Anthropic's Opus 4.8 and Sonnet 4.6, it is the production default for autonomous, multi-step work, and nothing about it is changing on June 18.
Pick the Gemini side if you want free, Google's models, and a 1M-token context window, but know that "Gemini CLI" is no longer the thing you install. For consumers it is being unified into Antigravity CLI, which is free, carries all the major models, and comes with rate limits sharp enough to lock you out for days.
A terminal agent, if the term is new to you, is an AI that lives in your command line, reads your files, runs commands, and edits code on its own instead of you copy-pasting into a chat window. Both of these are that. Only one of them is still going to exist for free users in two weeks.
Gemini CLI vs Claude Code at a glance
This is the comparison most people came for. It is accurate as of today, and the rightmost column is the one that changes the decision.
The headline reads "free and open versus paid and proprietary," and that was the honest summary for most of 2025. The status row is what flipped it.
The one fact that decides it in 2026: Gemini CLI is being retired
Google announced on May 19, 2026 that it is folding Gemini CLI into Google Antigravity, its agent-first development platform, and that the terminal experience going forward is Antigravity CLI. This is not a rename you can ignore. It comes with a hard date.
On June 18, 2026, Gemini CLI and the Gemini Code Assist IDE extensions stop serving requests for Google AI Pro, for Ultra, and for anyone using the free Gemini Code Assist for individuals tier. Gemini Code Assist for GitHub gets the same treatment: no new installs on GitHub organizations from that date, and existing requests stop being served in the weeks after. If you build on the free or Pro tier, your tool goes dark.
Two carve-outs matter. Enterprise customers on a Gemini Code Assist Standard or Enterprise license keep their access unchanged, with continued support and the latest Gemini models. And Gemini CLI stays reachable through paid Gemini and Gemini Enterprise Agent Platform API keys. So the code is not vanishing; the free consumer front door is.
Why Google did this is the useful part. Its own framing is that developers outgrew a single-agent terminal and now want multiple agents splitting up work against a shared backend. Antigravity CLI is built in Go for speed, runs asynchronous multi-agent jobs in the background so a large refactor does not freeze your session, and shares one agent harness with the Antigravity 2.0 desktop app, so a fix to the core agent shows up everywhere at once. It keeps the features people actually relied on: Agent Skills, Hooks, Subagents, and Extensions (rebranded as plugins). Google is candid that there is no 1:1 feature parity at launch.
Gemini CLI, and Antigravity CLI, what it becomes
Gemini CLI earned its 100,000-plus GitHub stars for one reason: it was the most generous free coding agent you could run in a terminal. The free tier gives you 60 requests per minute and 1,000 requests per day on a personal Google account, access to Gemini 3 models with a 1M-token context window, and the whole thing is open source under Apache 2.0. Install is a one-liner, npm install -g @google/gemini-cli, and it ships preinstalled in Google Cloud Shell and Colab.
That 1M-token window is the standout. A context window is how much text the model can hold in its head at once, like its short-term memory. At 1M tokens you can drop a substantial codebase in and ask for a project-wide refactor without manually feeding it files. For a solo builder doing exploratory work on a Google-heavy stack, free and roomy is a genuinely strong offer.
Here is where it lands after June 18: Antigravity CLI. The free tier carries all the major models, including Google's Gemini 3.5 Flash (the default), Gemini 3.1 Pro, and, by reports, even Claude and an open GPT model, with no credit card required. The catch is the rate limiting. Free access refreshes on roughly a five-hour cycle up to a weekly ceiling, and the early experience has been rough: users have reported being locked out for a full week after as little as 20 to 30 minutes of active use, with the tool simply refusing requests until the cooldown resets.
Claude Code: the paid production default
Claude Code is the agent most teams reach for when the work has to actually ship, and it is the one tool in this comparison whose roadmap is not moving on June 18. It runs Anthropic's current models: Sonnet 4.6 for fast everyday work and Opus 4.8, released May 28, 2026, for the hard, multi-file reasoning. It reads your filesystem, runs commands, and manages Git workflows autonomously while your code stays local.
There is no meaningful free tier here, and that is the trade. Claude Code comes bundled with a Claude Pro subscription at $20 a month (or $17 a month billed annually), and steps up through Max at $100 a month for 5x the usage and $200 a month for 20x. Published guidance puts Pro at roughly 60 weekly hours of Sonnet plus around 12 hours of Opus, Max 5x at about 75 weekly Opus hours with Sonnet effectively unlimited on normal loads, and Max 20x near 300 Opus hours. Usage runs on a five-hour rolling window with a weekly ceiling layered on top, so you manage both a short fuse and a long one.
What you buy for that money is reliability and reach. Claude Code is not just a terminal binary: the same sessions run through a VS Code extension with inline diffs, a standalone desktop app for reviewing changes and scheduling recurring tasks, and cloud sessions you can hand work to. It speaks MCP (the open protocol for connecting models to your tools), and it supports skills, hooks, and subagents for shaping how the agent behaves on your codebase.
On raw coding quality, the public picture favors Claude for autonomous work. On SWE-bench Verified, the standard benchmark of real GitHub issues an agent has to fix end to end, Anthropic's Opus sits in the top tier of agentic coding while Gemini's models, strong as they are, trail on those agentic tasks. One independent four-agent test of building a working app rated OpenAI's Codex the best of the set and Google's Gemini CLI the worst. Benchmarks are not your codebase, but the direction is consistent: Claude Code is tuned to finish long, messy jobs without losing the thread.
The rest of the field, in one breath
Two other terminal agents belong on your radar, even though they are not what people search for here.
OpenAI Codex is the third major terminal agent, and on several build tests it is the one that edges out the rest on first-pass correctness. If your team already lives in the ChatGPT ecosystem, it is the natural pick. OpenCode is the open-source, model-agnostic option: a community CLI that lets you point any model, including Claude or Gemini, at a Claude-Code-style workflow without locking into one vendor's billing.
If you want the full layout with current pricing, the 10 best AI coding assistants in 2026 covers the whole field, and the head-to-head on Codex vs Claude Code vs Cursor goes deep on the three terminal agents most teams actually choose between.
Who should pick what
The choice is rarely "best agent." It is "best agent for my situation and budget." Find your row.
The decision rule
Strip everything else away and one constraint flips the choice: are you willing to pay? If yes, Claude Code on a Max plan is the most dependable agent for work that has to ship, and June 18 does not touch it. If no, your free option is now Antigravity CLI, and your real job this month is migrating to it before Gemini CLI goes dark, then living within rate limits that can stall you for days. There is no longer a free, stable, unlimited-feeling Gemini CLI to default to. That option is the one thing the calendar is taking off the table.
How to migrate off Gemini CLI before June 18
If Gemini CLI is in your daily workflow, do this now rather than on the 17th. The whole move takes about 15 minutes.
Install Antigravity CLI
Antigravity CLI has been available to everyone since May 19. Grab it from the official download page at
antigravity.google/download. It runs alongside Gemini CLI, so you can install and test without ripping anything out yet.Carry over your skills, MCP servers, and config
Google published a migration guide that moves your existing Agent Skills, MCP servers, and customizations across. Hooks, subagents, and extensions carry over too, the last as Antigravity plugins. Expect close-but-not-identical behavior; there is no 1:1 parity at launch, so re-test your most-used workflow.
Decide your tier and budget the limits
On the free tier, plan around the five-hour refresh and weekly ceiling, and do not bet a deadline on it. If Antigravity becomes your main agent, a paid Google AI plan removes the lockout risk the same way a Claude Pro plan does for Claude Code.
If you are enterprise or API-based, confirm you are exempt
On a Gemini Code Assist Standard or Enterprise license, or driving Gemini CLI through a paid API key? Your access continues past June 18. Verify which bucket you are in before you change anything, so you do not migrate a setup that did not need to move.
FAQ
Is Claude Code better than Gemini CLI?
For autonomous, production-grade coding today, yes: Claude Code is more reliable on long, multi-step jobs and leads on agentic coding benchmarks. But the comparison is becoming moot, because Gemini CLI is being retired for consumers on June 18, 2026 and replaced by Antigravity CLI.
Can Gemini CLI replace Claude Code?
For free prototyping, large-context reads, and Google-stack work, the Gemini side competes well. For complex agentic refactors that have to land correctly, Claude Code still leads. And remember you would be adopting Antigravity CLI, not Gemini CLI, going forward.
What is the difference between Codex, Claude Code, and Gemini CLI?
Three terminal coding agents from three labs: Codex (OpenAI), Claude Code (Anthropic), and Gemini CLI (Google). They differ on model, price, and reliability. Codex often wins first-pass build tests, Claude Code wins sustained agentic work, and the Gemini option wins on free access and context size, with the large caveat that it is being folded into Antigravity CLI.
Can I use Claude Code skills in Gemini CLI?
No. Skills and hooks are not cross-compatible between the two tools. Antigravity CLI does carry over your Gemini CLI skills through Google's migration guide, but that is within Google's own ecosystem, not from Claude Code.
Does Gemini CLI fully stop working on June 18?
For free users, Google AI Pro, and Ultra, yes, requests stop being served. Enterprise customers on a Gemini Code Assist license and anyone using paid Gemini API keys keep working. The free consumer path is what closes.
Want the exact setup I run for terminal coding agents, including the model-routing and weekly-limit settings that keep costs sane? Grab the Claude Code and Codex setup checklist and I will send it over.
Jun 7, 2026
