Antigravity vs Claude Code vs Codex, Explained

Three tools. Three companies spending more on compute than some countries spend on roads. And they all shipped the same thing: a prompt box. No file editor, no visible terminal. You type what you want, the AI goes and does it, and you review the diff. Antigravity, Claude Code, Codex. Same shape, same pitch.

So either all three independently arrived at the perfect design, or someone copied someone’s homework and changed the font. The truth is stranger. The convergence is real, but the tools are completely different, and the difference is invisible from the outside. What happens in the thirty seconds after you press Enter is the only comparison that matters now, and it is the one nobody is making.

Antigravity vs Claude Code vs Codex: the short answer

There is no single winner, and looking for one misses the point. Antigravity is the fastest and most autonomous, built to run a fleet of agents while you manage. Claude Code is the deepest and most controllable, built to sit beside you and take direction. Codex is the most isolated, built to take a spec and hand back a finished pull request without you watching. Three different trade-off curves between speed, depth, and autonomy.

That is why the prompt box lies to you. All three present an identical text field, a status panel, and a diff viewer. Underneath, they behave like three different employees with three different temperaments. The rest of this comparison is about what the screenshot hides: how each one thinks once you hit Enter.

The prompt box ate the editor

For forty years, the code editor was the center of everything. You write code, the computer runs it, done. Then GitHub Copilot bolted a chatbot onto the sidebar. Then Cursor put the AI in the driver’s seat but kept the editor. Then Claude Code threw the editor out and declared the terminal enough. By mid-2026, everyone agrees on the same thing: the editor is not the product, the agent is.

Each company arrived from a different direction. Google took its IDE, ripped out the editor, and turned Antigravity into a management dashboard for a fleet of agents. Anthropic took its terminal tool and wrapped it in a desktop app, a web app, and IDE plugins. OpenAI built Codex as a cloud sandbox from day one. Three starting points, one destination: a text field, a status card, and a diff. Type “add dark mode to the settings page” into any of them and something goes off to work.

add dark mode to settings

Antigravity Gemini 3.5 Flash

add dark mode to settings

Claude Code Opus 4.7

add dark mode to settings

Codex GPT-5.5

What is Google Antigravity?

Antigravity is Google’s agent-first coding tool, and it is the most aggressive bet of the three. Google took its existing IDE, removed the editor entirely, and rebuilt the interface as mission control for a swarm of agents running Gemini 3.5 Flash. You do not write code in it. You delegate tasks, watch status cards fill in, and review the artifacts the agents produce.

Speed is the whole personality. Google clocked Flash at over 280 tokens per second, which you feel in your hands. At its I/O 2026 demo, Google ran 93 parallel agents that built an operating system core in twelve hours for under a thousand dollars, then ran Doom on it. Marketing subtlety this is not. The pitch is honest, though: you are the orchestrator, the agents do the building.

What happens in the 30 seconds after you hit Enter?

This is where the three tools stop looking alike. Start the same task in each, press Enter, and they diverge immediately. Antigravity’s Flash starts generating plans, spawning subagents, and touching files before you have finished reading the confirmation. Claude Code’s Opus 4.7 stops, plans, reads your project rules, and then makes one careful move. Codex ships your code to a remote VM and works there silently.

The depth gap is the part that does not show up in a demo. On SWE-Bench Pro, the benchmark that tests hard multi-file bugs in real open-source codebases, Opus scores 64% while Flash scores 55%. That nine-point gap is the distance between a refactor that works and one that almost works and then quietly breaks something three files away. Codex’s GPT-5.5 splits the difference: not the fastest, not the deepest, but the most hands-off.

Antigravity Speed

280+ tok/sec

Gemini 3.5 Flash starts planning and touching files before you finish reading the confirmation.

Claude Code Depth

64% SWE-Bench Pro

Opus 4.7 is six times slower per token, but it stops, plans, and reads your rules before it moves.

Codex Autonomy

PR hands-off

GPT-5.5 works in a remote sandbox you never watch, then hands back a finished pull request.

Is Antigravity really cheaper than Claude Code?

On the sticker, yes. In practice, barely. Gemini 3.5 Flash costs roughly $1.50 per million input tokens and $9 output, against Opus 4.7 at $5 and $25. That makes Flash about three times cheaper per token, which sounds like a closed case.

It is not. In practice Flash generates about three times more output tokens for an equivalent task. Independent teardowns caught this on launch week, and it lines up with the benchmarks: Flash burns a 73-million-token evaluation budget where other models use a fraction. It is fast and clever, but it is chatty. It overshoots, backtracks, and re-explains. Multiply cheaper tokens by three times as many tokens and the advantage mostly disappears. For a developer doing six hours a day of real work, both tools land around $100 to $200 a month, and Google and Anthropic now both sell a $200 top tier. Even the sticker price converged.

3× cheaper On paper

Gemini 3.5 Flash runs about $1.50 in and $9 out per million tokens, against Opus 4.7 at $5 and $25.

3× tokens In practice

Flash generates roughly three times more output for the same task. It overshoots, backtracks, and re-explains.

$200 The ceiling

Multiply cheaper tokens by three times as many, and the savings evaporate. Both top tiers now cost $200 a month.

The rules test nobody runs

The benchmark videos skip this one, and it might matter more than any score. Tell each agent to follow your style guide: never use default exports, always co-locate tests with source, use snake_case for database columns. Basic project rules every codebase has. Then watch what each tool does with them.

Opus follows rules almost too literally. Anthropic warns about this in its own migration docs. Say “never modify files outside the src directory” and it will refuse, even when the correct fix touches a config at the root. Stubborn and predictable, which is exactly what you want at two in the morning. Flash is faster and more creative but it drifts; developers have reported approving the same action twenty times for a basic HTML page, even with auto-execution set to always proceed. Codex sits at the disciplined end: as one developer put it, it “does not break your rules, making it incredibly reliable,” while Claude “has these moments of genius” but “also sometimes steamrolls your preferences without warning.”

Discipline Brilliance

Codex Never breaks a rule

Claude Code Brilliant, sometimes steamrolls

Antigravity Creative, but it drifts

How much of your day does each tool eat?

This is the cost nobody puts on the pricing page: how much of your attention each tool consumes. Antigravity wants you to be a manager. Its entire interface is a delegation surface of status cards, parallel agents, and artifact review. If you enjoy stepping back and letting the bots run, it fits your brain. If you feel anxious about code you did not write and cannot trace to a decision you made, it will make you miserable.

Claude Code wants you to be a co-pilot. It shows diffs, asks for approval, and gives you 25 lifecycle hook points where you can intercept and inspect every action it takes. That is an enormous amount of control, and also an enormous amount of interruption. A staff engineer who logged over a hundred hours on Claude Code and twenty on Codex summed it up: Claude is faster but needs guidance, Codex is slower but writes cleaner, more self-directed code. The right pick depends on a question with nothing to do with technology. Would you rather supervise less, or correct less?

Antigravity You: Manager

Eats your day Reviewing output

Status cards, parallel agents, artifact review. You orchestrate; the agents build. Great if you like delegating, miserable if you distrust code you did not write.

Claude Code You: Co-pilot

Eats your day Steering + approving

It shows diffs, asks for approval, and gives you 25 lifecycle hooks to intercept every action. That is a lot of control, and a lot of interruption.

Codex You: Client

Eats your day Correcting later

Hand it a spec, get a pull request. The least interruption while it runs, the most reliance on getting the brief right up front.

The full comparison, side by side

Read this as a map of trade-offs, not a scoreboard. The right column for you depends on whether you value speed, depth, or autonomy, and on how much supervision you can stand.

Which AI coding agent should you pick?

Pick by the relationship you want, not the benchmark. Antigravity is the fastest and most autonomous, and it wants to replace your workflow with a fleet of agents you supervise. Claude Code is the deepest and most controllable, and it wants to fit inside your workflow as a co-pilot you steer. Codex is the most isolated, and it wants to work next to your workflow without ever touching it. None of them are bad. All of them are expensive.

So stop reading screenshots. The only honest test is to take the messiest refactor sitting in your backlog right now, give it to all three, and watch how they think, not how they look. That is the whole game in 2026.

your messiest refactor

Antigravity Fastest · most autonomous Replaces your workflow

Claude Code Deepest · most controllable Fits inside your workflow

Codex Most isolated Works next to your workflow

For the animated version, with the speed, cost, and rules tests laid out on screen, watch the full breakdown on YouTube.