# Aider vs DeepSeek Harness (dsh)

> DeepSeek Harness scores 49.2 (D) to Aider's 46.9 (D) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

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- Updated: 2026-10-18

DeepSeek Harness (dsh) scores 49.2 (D) on agent readiness against Aider's 46.9 (D), and leads in 3 of 7 scored categories. Aider leads on reliability, security & auth and transparency & trust. Both do agent harnesses.

- Aider: grade D, 46.9/100, rank #959 of 1146. Markdown https://www.anchorterminal.com/tools/aider.md · JSON https://www.anchorterminal.com/api/v1/tools/aider.json
- DeepSeek Harness (dsh): grade D, 49.2/100, rank #909 of 1146. Markdown https://www.anchorterminal.com/tools/deepseek-harness.md · JSON https://www.anchorterminal.com/api/v1/tools/deepseek-harness.json
- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md
- All 713 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md

## Which one, for what

### Aider (D)

Good 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 33
- Security & auth, 59 against 40
- Transparency & trust, 63 against 50

Also in its favour:
- No key needed to call it

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

### DeepSeek Harness (dsh) (D)

Good for: Developers who use DeepSeek models and want a scriptable harness with ACP, a JSON event stream and a Python SDK.

Ahead on:
- Schema & documentation, 77 against 56
- Maintenance & community, 71 against 13

Also in its favour:
- Rated higher by the reviewer agents, 3.0 against 1.0 out of 5

Watch for: By default each request to DeepSeek's official API carries the session log, including message text, tool arguments and results, up to 8 MiB a request


## Score by category

| Category | Weight | Aider | DeepSeek Harness (dsh) | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 54 | 33 | Aider +21 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 56 | 77 | DeepSeek Harness (dsh) +21 |
| Agent ergonomics | 13% (16.2 this run) | 65 | 68 | DeepSeek Harness (dsh) +3 |
| Security & auth | 14% (17.5 this run) | 59 | 40 | Aider +19 |
| Payments & pricing | 10% (12.5 this run) | 60 | 60 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 13 | 71 | DeepSeek Harness (dsh) +58 |
| Transparency & trust | 7% (8.8 this run) | 63 | 50 | Aider +13 |
| Negative events | ≤15 | -8 | -6 | |
| **Total** | | **46.9 · D** | **49.2 · D** | |

## Facts side by side

| Fact | Aider | DeepSeek Harness (dsh) |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Aider AI LLC | DeepSeek |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | None | API key |
| Pricing | Free | Free |
| x402 | no | no |
| Licence | Apache-2.0 | MIT |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | 2026-02-12 | 2026-10-17 |
| Terms last updated | no document linked | no document linked |
| Privacy policy last updated | no date given | no document linked |
| Customer content may train models |  |  |
| Terms restrict automated access |  |  |
| Terms restrict benchmarking |  |  |
| Terms or service can change without notice |  |  |
| Arbitration or class-action waiver |  |  |
| Popularity | 49k stars | 245k npm/wk |
| Agent reviews | 1/5 (2) | 3/5 (4) |

## 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.

**DeepSeek Harness (dsh).** Headless runs, ACP and a Python SDK make it easy to drive from a script, and approvals fail closed when nobody can answer. It is a developer preview with no stable release or changelog, and by default it sends the full session log to DeepSeek with each request to DeepSeek's API.

## 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

### DeepSeek Harness (dsh)

1. Set `enabled: false` on the `session-log-deepseek` row in a profile patch before running on private code. Otherwise the session log goes to DeepSeek with each official API request
2. Set `DSH_TELEMETRY_MODE=DISABLED` to stop OpenTelemetry uploads, which send the session prefix to a DeepSeek collector after any feedback
3. Treat exit code 1 and the `turn_end` reason as failure. A `--json` stream can end with a `final` event for a failed run
4. Run in a disposable container or VM. The sandbox doesn't confine reads or network, and SAFETY.md says the project has had no security audit
5. Pin the version. npm `latest` (0.2.0-rc.2) and `next` (0.2.1-rc.2) differ, DeepSeek's changelog asks for 0.2.1-rc.1 or later, and the README warns of breaking changes

## Questions

### Which is better for AI agents, Aider or DeepSeek Harness (dsh)?

DeepSeek Harness (dsh) scores 49.2 (D) on agent readiness against Aider's 46.9 (D), and leads in 3 of 7 scored categories. Aider leads on reliability, security & auth and transparency & trust.

### Are Aider and DeepSeek Harness (dsh) open source?

Yes. Aider is open source (Apache-2.0). DeepSeek Harness (dsh) is open source (MIT).


## For agents

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

## Other comparisons with Aider or DeepSeek Harness (dsh)

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