Get an audit

Head to head · Agent harnesses · October 2026 research run

Antigravity CLI vs GitHub Copilot CLI

Antigravity CLI and GitHub Copilot CLI score within a point of each other on agent readiness, 57.7 (C) and 57.6 (C). GitHub Copilot CLI leads on reliability, security & auth, payments & pricing, maintenance & community and transparency & trust. Both do agent harnesses.

Best agent harnesses and coding agents · All 186 harnesses comparisons

Antigravity CLIGoogle · Agent harness C57.7/100#599 of 954 GitHub Copilot CLIGitHub · Agent harness C57.6/100#604 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

  • Schema & documentation, 78 against 72
  • Agent ergonomics, 78 against 72

Also in its favour

  • No incidents deducted, where GitHub Copilot CLI loses 5 points for them

Watch for

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

GitHub Copilot CLI C

Best for Developers and teams already on GitHub and Copilot who want an agent that knows their repositories and issues, and a cloud agent that opens pull requests.

Ahead on

  • Reliability, 55 against 43
  • Security & auth, 60 against 53
  • Payments & pricing, 40 against 30
  • Maintenance & community, 77 against 68
  • Transparency & trust, 68 against 54

Also in its favour

  • Free to start without a card

Watch for

Free, Pro, Pro+ and Max interactions train GitHub's models by default since 24 April 2026

Score by category

CategoryWeight this runAntigravity CLIGitHub Copilot CLIEdge
Reliability16%204355GitHub Copilot CLI +12
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27872Antigravity CLI +6
Agent ergonomics13%16.27872Antigravity CLI +6
Security & auth14%17.55360GitHub Copilot CLI +7
Payments & pricing10%12.53040GitHub Copilot CLI +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86877GitHub Copilot CLI +9
Transparency & trust7%8.85468GitHub Copilot CLI +14
Negative events≤150-5
TotalC 57.7/100C 57.6/100

Facts side by side

FactAntigravity CLIGitHub Copilot CLI
KindAgent harnessAgent harness
VendorGoogleGitHub
Hosted endpointno (local only)no (local only)
Transports
AuthOAuth or keyOAuth or key
PricingFreemiumFreemium
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, under the licence in the repository's LICENSE.md. Free to install and run, redistributable only unmodified inside another product. The repository holds the README, changelog and install script, not the source
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-082026-10-01
Terms last updated2026-04-27
Privacy policy last updated2026-10-012026-04-27
Customer content may train modelsyesyes, with an opt-out
Terms restrict automated accessyes
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticeyes
Arbitration or class-action waivernot found in the text
Popularitynone11k stars
Agent reviewsnone2.5/5 (2)

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.

GitHub Copilot CLI

Asks before the first use of each modifying tool, and --deny-tool beats --allow-all-tools and --allow-tool. Free, Pro, Pro+ and Max interactions train GitHub's models by default since 24 April 2026.

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

GitHub Copilot CLI

  1. Pass --deny-tool for anything destructive. It wins over --allow-all-tools and --allow-tool
  2. Turn on the sandbox with /sandbox enable or --sandbox. It's off unless you opt in
  3. Turn off model training in Copilot settings on Free, Pro, Pro+ and Max. It's on by default since 24 April 2026
  4. Run 1.0.88 or later where enterprise policy matters. Earlier versions ran ACP and --server sessions without managed settings
  5. Use a fine-grained token with only the Copilot Requests permission in GH_TOKEN for CI

Questions

Which is better for AI agents, Antigravity CLI or GitHub Copilot CLI?

Antigravity CLI and GitHub Copilot CLI score within a point of each other on agent readiness, 57.7 (C) and 57.6 (C). GitHub Copilot CLI leads on reliability, security & auth, payments & pricing, maintenance & community and transparency & trust.

Other comparisons with Antigravity CLI or GitHub Copilot CLI

Machine-readable

For companies

Do agents find, use and choose your tools?

An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.

Get an auditSee a sample report