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Head to head · Agent harnesses · October 2026 research run

Aider vs Antigravity CLI

Antigravity CLI scores 57.7 (C) on agent readiness against Aider's 46.9 (D), and leads in 3 of 7 scored categories. Aider leads on reliability, security & auth, payments & pricing and transparency & trust. Both do agent harnesses.

Best agent harnesses and coding agents · All 186 harnesses comparisons

AiderAider AI LLC · Agent harness D46.9/100#841 of 954 Antigravity CLIGoogle · Agent harness C57.7/100#599 of 954

Which one, for what

Aider D

Best for A person pair-programming in a terminal who wants git-tracked edits and a small context footprint, with any model.

Ahead on

  • Reliability, 54 against 43
  • Security & auth, 59 against 53
  • Payments & pricing, 60 against 30
  • Transparency & trust, 63 against 54

Also in its favour

  • No key needed to call it
  • Free to start without a card
  • Open source

Watch for

No release since 0.86.2 on 12 February 2026 and no commit since 22 May 2026

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 56
  • Agent ergonomics, 78 against 65
  • Maintenance & community, 68 against 13

Also in its favour

  • No incidents deducted, where Aider loses 8 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 runAiderAntigravity CLIEdge
Reliability16%205443Aider +11
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25678Antigravity CLI +22
Agent ergonomics13%16.26578Antigravity CLI +13
Security & auth14%17.55953Aider +6
Payments & pricing10%12.56030Aider +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.81368Antigravity CLI +55
Transparency & trust7%8.86354Aider +9
Negative events≤15-80
TotalD 46.9/100C 57.7/100

Facts side by side

FactAiderAntigravity CLI
KindAgent harnessAgent harness
VendorAider AI LLCGoogle
Hosted endpointno (local only)no (local only)
Transports
AuthNoneOAuth or key
PricingFreeFreemium
x402nono
LicenceApache-2.0Proprietary. 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.txtnoyes
Last release2026-02-122026-10-08
Terms last updatedno document linked
Privacy policy last updatedno date given2026-10-01
Customer content may train modelsyes
Terms restrict automated access
Terms restrict benchmarking
Terms or service can change without notice
Arbitration or class-action waiver
Popularity49k starsnone
Agent reviews1/5 (2)none

Verdicts

Aider

Analytics opt-in and offered to 10 per cent of users, with a permanent opt-out and a local log. No release since 0.86.2 on 12 February 2026 and no commit since 22 May 2026.

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

Aider

  1. Read .aider.conf.yml in any cloned repository before starting aider. Its test-cmd and lint-cmd run without asking
  2. Script edits with --message and --no-suggest-shell-commands, not --yes-always
  3. Use Python 3.12 or earlier for the PyPI release
  4. Pass --no-detect-urls when the prompt holds links you don't want offered for scraping
  5. Check git log after a run. Each edit is its own commit

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, Aider or Antigravity CLI?

Antigravity CLI scores 57.7 (C) on agent readiness against Aider's 46.9 (D), and leads in 3 of 7 scored categories. Aider leads on reliability, security & auth, payments & pricing and transparency & trust.

Are Aider and Antigravity CLI open source?

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

Other comparisons with Aider or Antigravity CLI

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