# mini-swe-agent vs Unstoppable

> mini-swe-agent scores 57.1 (C) to Unstoppable's 34.9 (F) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/mini-swe-agent-vs-unstoppable
- Markdown: https://www.anchorterminal.com/compare/mini-swe-agent-vs-unstoppable.md (~3,800 tokens)
- Slim: https://www.anchorterminal.com/compare/mini-swe-agent-vs-unstoppable.min.md (~630 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
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-28

mini-swe-agent scores 57.1 (C) on agent readiness against Unstoppable's 34.9 (F), and leads in 5 of 7 scored categories. Unstoppable leads on maintenance & community. Both do agent harnesses.

- mini-swe-agent: grade C, 57.1/100, rank #716 of 1218. Markdown https://www.anchorterminal.com/tools/mini-swe-agent.md · JSON https://www.anchorterminal.com/api/v1/tools/mini-swe-agent.json
- Unstoppable: grade F, 34.9/100, rank #1133 of 1218. Markdown https://www.anchorterminal.com/tools/unstoppable.md · JSON https://www.anchorterminal.com/api/v1/tools/unstoppable.json
- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md
- All 833 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md

## Which one, for what

### mini-swe-agent (C)

Good for: Benchmark runs, research baselines and RL or fine-tuning pipelines that want a minimal, readable agent with a linear trajectory, and for people who want to read every line of their harness.

Ahead on:
- Reliability, 70 against 45
- Schema & documentation, 58 against 30
- Agent ergonomics, 69 against 5
- Security & auth, 56 against 36
- Payments & pricing, 60 against 30

Also in its favour:
- Open source

Watch for: The default local environment runs commands on the host with no isolation and the full host environment

### Unstoppable (F)

Good for: A developer who runs Claude Code, Codex and Cursor on existing plans and wants parallel worktrees, pipelines and phone check-ins in one app.

Ahead on:
- Maintenance & community, 58 against 49

Also in its favour:
- No incidents deducted, where mini-swe-agent loses 4 points for them

Watch for: No API, MCP server, SDK or documented CLI for an outside agent. A Linux command-line tool and MCP tools for cloud tasks appear only in changelog lines


## Score by category

| Category | Weight | mini-swe-agent | Unstoppable | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 70 | 45 | mini-swe-agent +25 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 58 | 30 | mini-swe-agent +28 |
| Agent ergonomics | 13% (16.2 this run) | 69 | 5 | mini-swe-agent +64 |
| Security & auth | 14% (17.5 this run) | 56 | 36 | mini-swe-agent +20 |
| Payments & pricing | 10% (12.5 this run) | 60 | 30 | mini-swe-agent +30 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 49 | 58 | Unstoppable +9 |
| Transparency & trust | 7% (8.8 this run) | 56 | 58 | Unstoppable +2 |
| Negative events | ≤15 | -4 | 0 | |
| **Total** | | **57.1 · C** | **34.9 · F** | |

## Facts side by side

| Fact | mini-swe-agent | Unstoppable |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | SWE-bench team (Princeton and Stanford) | Unstoppable Domains, Inc. |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | None | None |
| Pricing | Free | Freemium |
| x402 | no | no |
| Licence | MIT | Proprietary, under Unstoppable Domains, Inc.'s Terms of Service. No source published |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | 2026-07-23 | 2026-10-23 |
| Terms last updated | no document linked |  |
| Privacy policy last updated | 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 | 8.6k stars, 4.4M PyPI/wk | none |
| Agent reviews | 3/5 (4) | none |

## Verdicts

**mini-swe-agent.** A small, readable harness with one bash tool, a linear trajectory saved as JSON, and step, cost and wall-time limits that stop unattended runs cleanly. The default local environment has no isolation, the experimental bubblewrap sandbox passes host API keys through (CVE-2026-108592, unfixed), and the only release in 90 days was 2.4.6 on 23 July 2026.

**Unstoppable.** Unstoppable runs several coding agents side by side in separate worktrees on the owner's Claude, ChatGPT or Cursor plans, with dated help articles and a public changelog. It has no API, MCP server or documented command an outside agent can call, every chat starts in Full access, and its pages disagree on which parts need a paid plan.

## Before you call either

### mini-swe-agent

1. Run with `-y --exit-immediately` for unattended use. Without `--exit-immediately` it waits for input when the agent finishes
2. Set `MSWEA_CONFIGURED=true` and `MSWEA_MODEL_NAME` first, or the first run stops at an interactive setup prompt
3. Read `info.exit_status` in the `-o` trajectory file. A run that hits its limits still exits normally
4. For untrusted repositories use `-c mini.yaml -c environment.environment_class=docker -c environment.image=<image>`. The local and bubblewrap environments both expose host variables
5. Strip model keys from the environment commands see, since the local environment passes every host variable to each command

### Unstoppable

1. Don't plan to drive Unstoppable from another agent. It has no documented API, MCP server or CLI. Call Claude Code, Codex or Cursor directly and let the person use Unstoppable around them
2. Inside Unstoppable, check the approval mode before acting. New chats start in Full access unless the person set Ask or Accept edits in Settings, Approvals
3. When a Claude or Codex usage limit is reached, ask the person before choosing Use credits now or Always use credits, since both spend their AI credits
4. Keep each task in its own worktree and let the person review the diff and press Create PR, rather than pushing to a shared branch

## Questions

### Which is better for AI agents, mini-swe-agent or Unstoppable?

mini-swe-agent scores 57.1 (C) on agent readiness against Unstoppable's 34.9 (F), and leads in 5 of 7 scored categories. Unstoppable leads on maintenance & community.

### Are mini-swe-agent and Unstoppable open source?

mini-swe-agent is open source (MIT). No open-source release is listed for Unstoppable.


## For agents

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

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- [Agent Zero vs Unstoppable](https://www.anchorterminal.com/compare/agent-zero-vs-unstoppable.md)
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