Claude Code vs Antigravity: Which One Should You Use

Why Claude Code vs Antigravity Is Not a Model Comparison

Claude Code is a terminal-first agent you drive from the command line, while Antigravity is a full IDE built around an agent manager. The real split is harness design, not underlying model quality.

The table below compares both tools across the five dimensions that change day-to-day work.

Read that table as a workflow question. Claude Code optimises for composability, and Antigravity optimises for oversight.

Why Neither Agent Can Verify Its Own Tests

Both agents write competent test code. The question that decides a release is different, and it is whether anyone independent confirmed those tests were meaningful.

Each harness handles the authoring step well and stops short of independent proof.

• Claude Code - one documented command writes the tests, runs them, and fixes the failures.
• Antigravity - a Browser Recording gives you playback of the UI actions the agent took.
• Both - the agent that wrote the assertion also decides whether the assertion passed.

A code review is the useful comparison. You would not accept a pull request whose only approval came from its own author.

This is where an external verifier belongs. Kane CLI from TestMu AI is a deterministic browser agent that validates rendered UI in a real Chrome browser from a natural-language objective.

It returns an evidence-backed pass or fail instead of a summary. It also installs into a coding agent as a skill, so the system that writes the code is not the system that clears it.

• Bifurcation - one objective naming several users splits into parallel child agents, each in its own session.
• Resilient runs - it dismisses cookie banners and unexpected modals instead of failing, up to fifty steps.
• Sealed evidence - every run writes an evidence pack you can attach to a pull request.
• Evidence-anchored verdict - a pass is granted only when observable state confirms it, not when the model says so.

Setup, authentication, and the full command reference live in the Kane CLI introduction documentation.

What Each Agent Leaves Behind After the Same Task

Give both agents an identical brief and the code they produce will look broadly similar. The evidence trail will not.

The list below tracks what each harness leaves behind at each stage of the same task.

• Planning - Antigravity produces an editable Implementation Plan. Claude Code plans inside the session.
• Execution - Claude Code streams tool calls to the terminal. Antigravity surfaces milestones in the review pane.
• UI checking - Antigravity can capture a Browser Recording. Claude Code drives Chrome through its browser integration.
• Handoff - Claude Code hands you a git diff and a commit. Antigravity hands you a reviewable artifact set.
• Repeatability - Claude Code replays through a script or a pipeline. Antigravity expects a human in the loop.

Every row above is self-reported, which is the gap the previous section covered. None of it comes from a system outside the agent that did the work.

Public benchmark evidence is thin on one side. The SWE-rebench agent leaderboard scored four coding harnesses on the same 111 problems from 65 repositories, in an evaluation window running from May to July 2026.

• Junie - 61.8% resolved rate, 73.9% Pass@5.
• Claude Code - 60.4% resolved rate, 75.7% Pass@5.
• Codex - 58.0% resolved rate, 73.0% Pass@5.
• Cursor - 51.7% resolved rate, 65.8% Pass@5.

Antigravity does not appear on that board at all. A ten-point spread between harnesses is the clearest published sign that the wrapper matters, and Google has posted no third-party score to sit against it.

For a wider view of how these harnesses sit next to one another, our roundup of agentic coding CLI tools covers the terminal-native field in more depth.

Which Limits Show Up First in Real Projects

Claude Code leaves thin evidence of what it verified, and Antigravity confines browser checks to Chrome. Both agents grade their own work, which is the failure mode neither one documents.

Start with the limits that show up first in Claude Code.

• No review queue - work is reviewed per session, so parallel sessions are hard to supervise at once.
• Evidence is transient - terminal output scrolls away unless you deliberately capture it.
• Setup is filesystem-based - skills, hooks, and CLAUDE.md need conventions a team actually agrees on.

Antigravity trades those problems for a different set.

• Chrome only - the browser slash command controls debugging in Google Chrome, and no other engine.
• Model access varies by tier - Enterprise plans lose Claude Sonnet 4.6, Claude Opus 4.6, and GPT-OSS-120b.
• Supervision is the design - the review pane assumes someone is watching, which limits unattended runs.

The Enterprise model restriction deserves a second look during procurement. A team that standardised on Claude Opus 4.6 during a Pro trial will lose it on upgrade.

The Chrome limit has a straightforward answer. Export the agent-written flows to Playwright, then run that suite across browsers on the TestMu AI automation cloud.

Grid capabilities and framework setup are covered in the Playwright testing documentation.

Can You Run Claude Code Inside Antigravity

Yes, mechanically. Claude Code is a terminal CLI, so it runs in the Antigravity integrated terminal like any other command. Nothing connects the two harnesses once it does.

You end up with two agents sharing one working directory. The list below covers what is not shared between them.

• No shared plan - the Antigravity Implementation Plan is invisible to Claude Code, and the reverse also holds.
• No shared permissions - each harness applies its own approval rules to the same files.
• No shared artifact trail - work done in the terminal never appears in the Antigravity review pane.
• Real edit conflicts - two agents writing the same file will overwrite each other without warning.

Treat one agent as the author and keep the other idle. Then give both the same external gate, which is the pattern we documented in our Claude Code Kane CLI verification write-up.

Why the Free Tier Is Not Always the Cheaper Option

The two tools price access differently, and the shape of the plan matters more than the headline number.

The comparison below covers the access model each vendor documents. Check the vendor page for current figures before you budget.

A free tier looks decisive until the five-hour limit interrupts a migration. Budget on quota shape, not on entry price.

Which One Fits Terminal Work Versus Supervised Review

Pick Claude Code when your work lives in the terminal and a CI pipeline. Pick Antigravity when you want a visual review queue and a reviewable implementation plan before any code lands.

Neither choice is permanent. Antigravity runs Claude models, and Claude Code runs in the Antigravity terminal.

Teams evaluating the underlying models rather than the harness will get more from our breakdown of the best LLM for coding.

What to Do Once You Have Picked One

The Claude Code vs Antigravity question resolves faster once you stop treating it as a model comparison. Antigravity ships Claude models, so the real decision is about workflow shape.

Choose the terminal when you automate. Choose the IDE when you supervise. Then work through the four steps below.

• Commit the choice for one full sprint before you re-evaluate it.
• Check your plan tier against the model list, especially before an Enterprise upgrade.
• Install an external verifier as a skill so the author is never the approver.
• Move the browser check off Chrome alone once the agent-written flows stabilise.

The tool choice matters less than that last point. Whichever agent you run, something other than that agent has to confirm the software works.