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Head to head · Agent harnesses · October 2026 research run

Antigravity CLI vs Claude Code

Claude Code scores 61.9 (C) on agent readiness against Antigravity CLI's 57.7 (C), and leads in 6 of 7 scored categories. Antigravity CLI leads on payments & pricing. Both do agent harnesses.

Best agent harnesses and coding agents · All 186 harnesses comparisons

Antigravity CLIGoogle · Agent harness C57.7/100#599 of 954 Claude CodeAnthropic · Agent harness C61.9/100#452 of 954

Which one, for what

Antigravity CLI C

Best for Developers on Google AI plans or Gemini Enterprise who want a terminal agent with a sandbox on by default and access to several model families, depending on plan.

Ahead on

  • Payments & pricing, 30 against 20

Also in its favour

  • No incidents deducted, where Claude Code loses 6 points for them

Watch for

Closed source. The repository holds the README, changelog and examples, with no source and no licence file

Claude Code C

Best for A developer or a pipeline that wants Claude doing repository work with fine-grained, centrally managed permissions and an SDK for the same loop.

Ahead on

  • Reliability, 50 against 43
  • Agent ergonomics, 87 against 78
  • Security & auth, 80 against 53
  • Maintenance & community, 82 against 68
  • Transparency & trust, 81 against 54

Watch for

The sandbox is off by default and native Windows has none

Score by category

CategoryWeight this runAntigravity CLIClaude CodeEdge
Reliability16%204350Claude Code +7
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27880Claude Code +2
Agent ergonomics13%16.27887Claude Code +9
Security & auth14%17.55380Claude Code +27
Payments & pricing10%12.53020Antigravity CLI +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86882Claude Code +14
Transparency & trust7%8.85481Claude Code +27
Negative events≤150-6
TotalC 57.7/100C 61.9/100

Facts side by side

FactAntigravity CLIClaude Code
KindAgent harnessAgent harness
VendorGoogleAnthropic
Hosted endpointno (local only)no (local only)
Transports
AuthOAuth or keyOAuth or key
PricingFreemiumPaid
x402nono
LicenceProprietary. The repository holds the README, changelog and examples, with no source and no licence file. Use is under the Google Antigravity Additional Terms of Service, the Google Terms of Service and the Privacy PolicyProprietary. LICENSE.md says All rights reserved, with use under Anthropic's Commercial Terms. The GitHub repository holds the changelog, plugins and examples, not the source
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-082026-10-01
Terms last updatedno date given
Privacy policy last updated2026-10-01no date given
Customer content may train modelsyesyes, with an opt-out
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticenot found in the text
Arbitration or class-action waiveryes
Popularitynone141k stars

Verdicts

Antigravity CLI

Google's terminal agent, shipped as a closed-source binary with a terminal sandbox on by default on macOS and Linux and documented headless JSON output. Interactions are used to improve Google products unless users opt out, and a headless run exits 0 when a tool is denied.

Claude Code

Six permission modes, allow, ask and deny rules down to command arguments, PreToolUse hooks, and managed settings that can disable bypass and auto mode. The sandbox is off by default and native Windows has none.

Before you call either

Antigravity CLI

  1. Read the status field from --output-format json and read stderr too. A tool refused for lack of approval still exits 0
  2. Pre-approve each shell command and tool a headless run needs with action(target) rules under permissions.allow in ~/.gemini/antigravity-cli/settings.json, because headless runs cannot ask
  3. Export GEMINI_API_KEY after setting modelProvider to gemini. The CLI won't start when the key is missing, and setting the variable alone has no effect
  4. Turn off Enable Telemetry in the Account settings before running on private repositories if Interactions should not be used for product improvement
  5. Set --print-timeout explicitly. The docs give a five-minute default, while agy --help shows 0s

Claude Code

  1. Pass --permission-mode on every claude -p run. An unset mode can start in auto mode, depending on version, plan, provider and telemetry
  2. Turn on the sandbox with sandbox.enabled and set allowUnsandboxedCommands to false, or Claude can retry a blocked command outside it
  3. Set CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1 on a Claude login to stop metrics and error reports in one go
  4. Set autoUpdatesChannel to stable or DISABLE_AUTOUPDATER=1 in CI. Native installs update themselves about once a day
  5. Cap pipeline runs with --max-turns and --max-budget-usd

Questions

Which is better for AI agents, Antigravity CLI or Claude Code?

Claude Code scores 61.9 (C) on agent readiness against Antigravity CLI's 57.7 (C), and leads in 6 of 7 scored categories. Antigravity CLI leads on payments & pricing.

Other comparisons with Antigravity CLI or Claude Code

Disclosure

Anthropic makes the models this research run and the review panel run on. This listing was graded by agents running on Claude, by the same published checklist as every other listing, and the panel doesn't review it, because every reviewer runs on Claude too.

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