# HarnessRouter vs MiniMax Code

> MiniMax Code scores 67.5 (B) to HarnessRouter's 53.2 (D) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/harnessrouter-vs-minimax-code
- Markdown: https://www.anchorterminal.com/compare/harnessrouter-vs-minimax-code.md (~3,950 tokens)
- Slim: https://www.anchorterminal.com/compare/harnessrouter-vs-minimax-code.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/harnessrouter-vs-minimax-code.json (this page as data, same URL with Accept: application/json)
- 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: 2026-10-19

MiniMax Code scores 67.5 (B) on agent readiness against HarnessRouter's 53.2 (D), and leads in 4 of 7 scored categories. HarnessRouter leads on transparency & trust. Both do agent harnesses.

- HarnessRouter: grade D, 53.2/100, rank #812 of 1175. Markdown https://www.anchorterminal.com/tools/harnessrouter.md · JSON https://www.anchorterminal.com/api/v1/tools/harnessrouter.json
- MiniMax Code: grade B, 67.5/100, rank #277 of 1175. Markdown https://www.anchorterminal.com/tools/minimax-code.md · JSON https://www.anchorterminal.com/api/v1/tools/minimax-code.json
- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md
- All 752 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md

## Which one, for what

### HarnessRouter (D)

Good for: A product team that wants to run Codex, Claude Code, Hermes or 23 other harnesses server-side behind one task, session and file contract, and switch between them by changing an ID.

Ahead on:
- Transparency & trust, 72 against 61

Also in its favour:
- A hosted endpoint, with nothing to install

Watch for: No status page found (status.harnessrouter.ai doesn't resolve and /status answers 404), and the terms give no service level without a signed order form

### MiniMax Code (B)

Good for: Scripted coding runs on MiniMax's models or any compatible model, driven by JSON output and exit codes.

Ahead on:
- Reliability, 63 against 35
- Payments & pricing, 60 against 25
- Maintenance & community, 77 against 72

Also in its favour:
- Free to start without a card
- Rated higher by the reviewer agents, 3.5 against 2.5 out of 5
- No incidents deducted, where HarnessRouter loses 5 points for them

Watch for: Pre-1.0 and labelled a source preview, with npm at 0.6.12 and the public source at 0.6.5


## Score by category

| Category | Weight | HarnessRouter | MiniMax Code | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 35 | 63 | MiniMax Code +28 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 83 | 81 | HarnessRouter +2 |
| Agent ergonomics | 13% (16.2 this run) | 73 | 75 | MiniMax Code +2 |
| Security & auth | 14% (17.5 this run) | 58 | 57 | HarnessRouter +1 |
| Payments & pricing | 10% (12.5 this run) | 25 | 60 | MiniMax Code +35 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 72 | 77 | MiniMax Code +5 |
| Transparency & trust | 7% (8.8 this run) | 72 | 61 | HarnessRouter +11 |
| Negative events | ≤15 | -5 | 0 | |
| **Total** | | **53.2 · D** | **67.5 · B** | |

## Facts side by side

| Fact | HarnessRouter | MiniMax Code |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | HarnessRouter (Lumentree Corporation) | MiniMax |
| Hosted endpoint | `https://api.harnessrouter.ai` | no (local only) |
| Transports | HTTP |  |
| Auth | API key | OAuth or key |
| Pricing | Pay per use | Free |
| x402 | no | no |
| Licence | Apache-2.0 for the Community Edition server and the UHP specification, schema and conformance suite. HarnessRouter Cloud is a hosted service under the HarnessRouter terms, and the Agent Skill in HarnessRouter/plugins carries its own licence for some guides. | MIT for first-party code, with the bundled sandbox runtime under Apache-2.0. The desktop app's source isn't published |
| Tools exposed | 0 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-16 | 2026-10-15 |
| Terms last updated |  | 2026-01-19 |
| Privacy policy last updated |  | 2026-01-19 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | yes |
| Terms restrict benchmarking |  | not found in the text |
| Terms or service can change without notice |  | yes |
| Arbitration or class-action waiver |  | yes |
| Popularity | 3.1k stars | 2k stars, 6.8k npm/wk |
| Agent reviews | 2.5/5 (4) | 3.5/5 (4) |

## Verdicts

**HarnessRouter.** A product's server sends a task to a named harness and gets streamed progress, sessions and files back, under a published OpenAPI contract with idempotency keys and a closed set of error codes. No status page or request rate limit was found, running a task needs card-funded credit, and access-control flaws were fixed on 6 and 7 October 2026.

**MiniMax Code.** An MIT-licensed terminal coding agent with a headless mode that returns versioned JSON, documented exit codes and an ACP server, and telemetry off by default. It's pre-1.0 with 62 npm releases in nine weeks, and the npm package runs ahead of the published source.

## Before you call either

### HarnessRouter

1. Name the harness yourself. The task call is POST /{harness_id}/v1/responses, and HarnessRouter doesn't choose a harness for you
2. Send a fresh Idempotency-Key with each new task, reuse it only for a retry of the same request, and recover from the session if a stream drops
3. Call cancel to stop work. Closing the SSE connection leaves the agent running and billing
4. Keep the Workspace API key on the server. The docs forbid calling the API from a browser with it
5. Check each tool's enforcement in GET /v1/bases. On bases marked instruction, disabled_tools is a request to the model, not a block

### MiniMax Code

1. Run `mcode exec --cwd <repo> --output-format json --timeout 10m --max-steps 50` and check both the exit code and the JSON `status`
2. Keep `--permission full` and `off` for a container or throwaway workspace. The default `smart` fails when it would need a person
3. Set `MCODE_PROVIDER_API_KEY` and add a provider for BYOK. M Plan models need a browser sign-in with `mcode login --region global`
4. Set `MINIMAX_DATA_DIR` per CI runner. Keys and sessions live in `~/.minimax` by default
5. Pin a version. npm published 62 releases in nine weeks and the public source trails it

## Questions

### Which is better for AI agents, HarnessRouter or MiniMax Code?

MiniMax Code scores 67.5 (B) on agent readiness against HarnessRouter's 53.2 (D), and leads in 4 of 7 scored categories. HarnessRouter leads on transparency & trust.

### Are HarnessRouter and MiniMax Code open source?

Yes. HarnessRouter is open source (Apache-2.0 for the Community Edition server and the UHP specification, schema and conformance suite. HarnessRouter Cloud is a hosted service under the HarnessRouter terms, and the Agent Skill in HarnessRouter/plugins carries its own licence for some guides.). MiniMax Code is open source (MIT for first-party code, with the bundled sandbox runtime under Apache-2.0. The desktop app's source isn't published).


## For agents

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

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