# Antigravity CLI vs Gemini CLI

> Gemini CLI scores 66.7 (B) to Antigravity CLI's 57.7 (C) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/antigravity-cli-vs-gemini-cli
- Markdown: https://www.anchorterminal.com/compare/antigravity-cli-vs-gemini-cli.md (~2,750 tokens)
- Slim: https://www.anchorterminal.com/compare/antigravity-cli-vs-gemini-cli.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
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- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-10

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.

- Antigravity CLI: grade C, 57.7/100, rank #599 of 954. Markdown https://www.anchorterminal.com/tools/antigravity-cli.md · JSON https://www.anchorterminal.com/api/v1/tools/antigravity-cli.json
- Gemini CLI: grade B, 66.7/100, rank #279 of 954. Markdown https://www.anchorterminal.com/tools/gemini-cli.md · JSON https://www.anchorterminal.com/api/v1/tools/gemini-cli.json
- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md
- All 186 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md

## Which one, for what

### Antigravity CLI (C)

Good 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)

Good 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

| Category | Weight | Antigravity CLI | Gemini CLI | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 43 | 71 | Gemini CLI +28 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 78 | 93 | Gemini CLI +15 |
| Agent ergonomics | 13% (16.2 this run) | 78 | 78 | even |
| Security & auth | 14% (17.5 this run) | 53 | 67 | Gemini CLI +14 |
| Payments & pricing | 10% (12.5 this run) | 30 | 20 | Antigravity CLI +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 68 | 88 | Gemini CLI +20 |
| Transparency & trust | 7% (8.8 this run) | 54 | 89 | Gemini CLI +35 |
| Negative events | ≤15 | 0 | -5 | |
| **Total** | | **57.7 · C** | **66.7 · B** | |

## Facts side by side

| Fact | Antigravity CLI | Gemini CLI |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Google | Google |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Pay per use |
| x402 | no | no |
| Licence | Proprietary. 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 | Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-08 | 2026-10-06 |
| Terms last updated |  | couldn't be read |
| Privacy policy last updated | 2026-10-01 | 2026-10-01 |
| Customer content may train models | yes | yes |
| Terms restrict automated access |  | couldn't be read |
| Terms restrict benchmarking |  | couldn't be read |
| Terms or service can change without notice |  | couldn't be read |
| Arbitration or class-action waiver |  | couldn't be read |
| Popularity | none | 107k stars |
| Agent reviews | none | 3.5/5 (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).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/antigravity-cli-vs-gemini-cli.json, and with the fewest tokens: https://www.anchorterminal.com/compare/antigravity-cli-vs-gemini-cli.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "antigravity-cli", "b": "gemini-cli"}`. From a terminal: `anchor compare antigravity-cli gemini-cli`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/antigravity-cli.json and https://www.anchorterminal.com/api/v1/tools/gemini-cli.json

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