Get an audit

Head to head · Agent harnesses · October 2026 research run

Antigravity CLI vs Gemini CLI

Gemini CLI scores 66.7 (B) on agent readiness against Antigravity CLI's 57.7 (C), and leads in 5 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 Gemini CLIGoogle · Agent harness B66.7/100#279 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 Gemini 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

Gemini CLI B

Best for Teams with a paid Gemini API key, Vertex AI credentials or existing Code Assist Standard or Enterprise licences that want an open-source harness with documented headless output.

Ahead on

  • Reliability, 71 against 43
  • Schema & documentation, 93 against 78
  • Security & auth, 67 against 53
  • Maintenance & community, 88 against 68
  • Transparency & trust, 89 against 54

Also in its favour

  • Open source

Watch for

Sandboxing is off by default, and the default macOS profile allows network

Score by category

CategoryWeight this runAntigravity CLIGemini CLIEdge
Reliability16%204371Gemini CLI +28
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27893Gemini CLI +15
Agent ergonomics13%16.27878even
Security & auth14%17.55367Gemini CLI +14
Payments & pricing10%12.53020Antigravity CLI +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86888Gemini CLI +20
Transparency & trust7%8.85489Gemini CLI +35
Negative events≤150-5
TotalC 57.7/100B 66.7/100

Facts side by side

FactAntigravity CLIGemini CLI
KindAgent harnessAgent harness
VendorGoogleGoogle
Hosted endpointno (local only)no (local only)
Transports
AuthOAuth or keyOAuth or key
PricingFreemiumPay per use
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 PolicyApache-2.0
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-082026-10-06
Terms last updatedcouldn't be read
Privacy policy last updated2026-10-012026-10-01
Customer content may train modelsyesyes
Terms restrict automated accesscouldn't be read
Terms restrict benchmarkingcouldn't be read
Terms or service can change without noticecouldn't be read
Arbitration or class-action waivercouldn't be read
Popularitynone107k stars
Agent reviewsnone3.5/5 (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.

Gemini CLI

Apache-2.0, with 16 stable releases since 3 July and documented headless output. Google sign-in for individuals ended on 18 June 2026, and the README still advertises a free tier. Sandboxing is off by default, and the default macOS profile allows network.

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

Gemini CLI

  1. Set GEMINI_TRUST_WORKSPACE to true only for trusted inputs in CI. Since 0.39.1 headless mode doesn't trust a folder on its own
  2. Turn on the sandbox with -s or tools.sandbox, and pick a proxied Seatbelt profile on macOS to cut network
  3. Set privacy.usageStatisticsEnabled to false to stop usage statistics
  4. Since 0.63.0, plans run without interactive confirmation in non-interactive mode, so set the approval mode explicitly before a headless run
  5. Authenticate with a paid Gemini API key or Vertex credentials. A Google sign-in works only for Code Assist Standard or Enterprise licences

Questions

Which is better for AI agents, Antigravity CLI or Gemini CLI?

Gemini CLI scores 66.7 (B) on agent readiness against Antigravity CLI's 57.7 (C), and leads in 5 of 7 scored categories. Antigravity CLI leads on payments & pricing.

Are Antigravity CLI and Gemini CLI open source?

No open-source release is listed for Antigravity CLI. Gemini CLI is open source (Apache-2.0).

Other comparisons with Antigravity CLI or Gemini 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