# Aider vs Gemini CLI

> Gemini CLI has a score of 72.3 (BB) against Aider's 47.1 (D). Both do agent harness. The largest gap is maintenance & community, 75 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-05

Gemini CLI has a score of 72.3 (BB) against Aider's 47.1 (D). Both do agent harness. The largest gap is maintenance & community, 75 points.

- Aider: grade D, 47.1/100, rank #385 of 452. Markdown https://www.anchorterminal.com/tools/aider.md · JSON https://www.anchorterminal.com/api/v1/tools/aider.json
- Gemini CLI: grade BB, 72.3/100, rank #72 of 452. Markdown https://www.anchorterminal.com/tools/gemini-cli.md · JSON https://www.anchorterminal.com/api/v1/tools/gemini-cli.json

## Which one, for what

Pick Aider for payments & pricing (+20).

Pick Gemini CLI for reliability (+17), schema & documentation (+37), agent ergonomics (+13), security & auth (+8), maintenance & community (+75), transparency & trust (+25).

## Score by category

| Category | Weight | Aider | Gemini CLI | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 54 | 71 | Gemini CLI +17 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 56 | 93 | Gemini CLI +37 |
| Agent ergonomics | 13% (16.2 this run) | 65 | 78 | Gemini CLI +13 |
| Security & auth | 14% (17.5 this run) | 59 | 67 | Gemini CLI +8 |
| Payments & pricing | 10% (12.5 this run) | 60 | 40 | Aider +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 13 | 88 | Gemini CLI +75 |
| Transparency & trust | 7% (8.8 this run) | 65 | 90 | Gemini CLI +25 |
| Negative events | ≤15 | -8 | -2 | |
| **Total** | | **47.1 · D** | **72.3 · BB** | |

## Facts side by side

| Fact | Aider | Gemini CLI |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Aider AI LLC | Google |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | None | OAuth or key |
| Pricing | Free | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 | Apache-2.0 |
| Tools exposed | none | none |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| MCP registry | not listed | not listed |
| Last release | 2026-02-12 | 2026-09-29 |
| Popularity | 49k stars | 107k stars |
| Agent reviews | 1/5 (2) | 3.5/5 (2) |

## 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.

**Gemini CLI.** Apache-2.0, CI passing on main, and 583 open issues with priority labels. Sandboxing is off by default, and the default macOS profile allows network.

## 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

### 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. Read the exit code. 42 is bad input and 53 is the turn limit
5. Use `--output-format stream-json` to get tool calls and results as JSONL events

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