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Head to head · Agent harnesses · October 2026 research run

Agent Zero vs Antigravity CLI

Antigravity CLI scores 57.4 (C) on agent readiness against Agent Zero's 54.2 (C), and leads in 2 of 7 scored categories. Agent Zero leads on reliability, payments & pricing and maintenance & community. Both do agent harnesses.

Best agent harnesses and coding agents · All 205 harnesses comparisons

Agent ZeroAgent Zero, s.r.o. · Agent harness C54.2/100#709 of 986 Antigravity CLIGoogle · Agent harness C57.4/100#624 of 986

Which one, for what

Agent Zero C

Best for A technical owner who wants an agent with its own Linux machine, reachable from Telegram, WhatsApp or email, with scheduled tasks and editable memory.

Ahead on

  • Reliability, 57 against 43
  • Payments & pricing, 60 against 30
  • Maintenance & community, 75 against 68

Also in its favour

  • No key needed to call it
  • Open source

Watch for

No approval step before shell commands, file changes or outgoing messages. Tool Access defaults to allow

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 64
  • Agent ergonomics, 78 against 62

Also in its favour

  • No incidents deducted, where Agent Zero loses 6 points for them

Watch for

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

Score by category

CategoryWeight this runAgent ZeroAntigravity CLIEdge
Reliability16%205743Agent Zero +14
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26478Antigravity CLI +14
Agent ergonomics13%16.26278Antigravity CLI +16
Security & auth14%17.55453Agent Zero +1
Payments & pricing10%12.56030Agent Zero +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87568Agent Zero +7
Transparency & trust7%8.85551Agent Zero +4
Negative events≤15-60
TotalC 54.2/100C 57.4/100

Facts side by side

FactAgent ZeroAntigravity CLI
KindAgent harnessAgent harness
VendorAgent Zero, s.r.o.Google
Hosted endpointno (local only)no (local only)
Transports
AuthNoneOAuth or key
PricingFreeFreemium
x402nono
LicenceMITProprietary. 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 Policy
Read-only variant documentednono
llms.txtyesyes
Last release2026-09-232026-10-08
Terms last updatedno document linkedno date given
Privacy policy last updatedno document linked2026-10-01
Customer content may train modelsyes, with an opt-out
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticenot found in the text
Arbitration or class-action waivernot found in the text
Popularity19k starsnone

Verdicts

Agent Zero

Self-hosted under the MIT licence, with nine releases in the 90 days to 12 October 2026 and breaking changes listed in the release notes. The agent runs shell commands in its container with no approval step, the web interface has no login by default, and five CVEs from the past year have no published GitHub advisory.

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.

Before you call either

Agent Zero

  1. Set a UI login and password in Settings before publishing the port or opening a tunnel. The default has none
  2. Fill allowed_users, allowed_numbers or sender_whitelist before enabling a channel. An empty list accepts every sender
  3. Enable the Infection Check plugin when the agent reads mail, web pages or MCP results. It ships disabled
  4. Run v2.12 or later. It fixes a Telegram webhook authentication bypass and a WhatsApp media path traversal
  5. Call POST /api_message with the X-API-KEY header. The token changes when the UI login or password changes

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

Questions

Which is better for AI agents, Agent Zero or Antigravity CLI?

Antigravity CLI scores 57.4 (C) on agent readiness against Agent Zero's 54.2 (C), and leads in 2 of 7 scored categories. Agent Zero leads on reliability, payments & pricing and maintenance & community.

Are Agent Zero and Antigravity CLI open source?

Agent Zero is open source (MIT). No open-source release is listed for Antigravity CLI.

Other comparisons with Agent Zero or Antigravity CLI

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