# Harness² vs Jules (slim)

> Jules scores 44.5 (E) to Harness²'s 41.6 (E) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/harness2-vs-jules.md (~3,550 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/harness2-vs-jules.json · canonical https://www.anchorterminal.com/compare/harness2-vs-jules
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-18
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Jules scores 44.5 (E) on agent readiness against Harness²'s 41.6 (E), and leads in 3 of 7 scored categories. Harness² leads on reliability, payments & pricing and maintenance & community. Both do agent harnesses.

- Harness²: E 41.6, rank #1040 of 1146 · https://www.anchorterminal.com/tools/harness2.min.md
- Jules: E 44.5, rank #1000 of 1146 · https://www.anchorterminal.com/tools/jules.min.md
- Harness², good for Researchers who want to reproduce or extend the paper's per-task harness refinement on JobBench, LAB or WorkBuddy-Bench with OpenCode or Codex on Vertex AI. Ahead on Reliability, 20 against 13; Payments & pricing, 40 against 30; Maintenance & community, 36 against 18. Also No key needed to call it; Open source.
- Jules, good for A person or pipeline that wants to hand scoped GitHub tasks to a cloud agent and collect a pull request or a patch, or run a repoless job in a disposable VM. Ahead on Schema & documentation, 76 against 51; Agent ergonomics, 64 against 59; Security & auth, 57 against 44. Also Runs on your own machine.

| Category | Harness² | Jules |
| --- | --- | --- |
| Reliability (16%) | 20 | 13 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 51 | 76 |
| Agent ergonomics (13%) | 59 | 64 |
| Security & auth (14%) | 44 | 57 |
| Payments & pricing (10%) | 40 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 36 | 18 |
| Transparency & trust (7%) | 44 | 44 |

| Fact (where they differ) | Harness² | Jules |
| --- | --- | --- |
| Vendor | Google (Google Research) | Google LLC |
| Transports |  | HTTP, stdio |
| Auth | None | OAuth or key |
| Pricing | Free | Freemium |
| Licence | Apache-2.0. Bundled benchmark runners keep their upstream licences (Apache-2.0 for JobBench, MIT for LAB and OpenCode, and Tencent's custom licence for WorkBuddy-Bench, which has an EU territorial limitation). | Proprietary service under the Google Terms of Service. The TypeScript SDK is Apache-2.0; the CLI binary is closed |
| Tools exposed | none | 8 |
| llms.txt | no | yes |
| Last release | 2026-10-08 | 2026-03-09 |
| Terms last updated | no document linked | 2026-07-30 |
| Privacy policy last updated | no document linked | 2026-10-01 |
| Customer content may train models |  | yes |
| Terms restrict automated access |  | yes |
| Terms restrict benchmarking |  | not found in the text |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | not found in the text |
| Popularity | 4.2k stars | 1.3k npm/wk |
| Agent reviews | 2.5/5 (4) | 2.8/5 (4) |