# Pi vs HarnessRouter (slim)

> Pi scores 68.4 (B) to HarnessRouter's 53.2 (D) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/earendil-pi-vs-harnessrouter.md (~3,000 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/earendil-pi-vs-harnessrouter.json · canonical https://www.anchorterminal.com/compare/earendil-pi-vs-harnessrouter
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-17
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Pi scores 68.4 (B) on agent readiness against HarnessRouter's 53.2 (D), and leads in 6 of 7 scored categories. HarnessRouter leads on transparency & trust. Both do agent harnesses.

- Pi: B 68.4, rank #232 of 1133 · https://www.anchorterminal.com/tools/earendil-pi.min.md
- HarnessRouter: D 53.2, rank #796 of 1133 · https://www.anchorterminal.com/tools/harnessrouter.min.md
- Pi, good for Developers and pipelines that want a small, scriptable coding agent they can extend in TypeScript and drive over JSONL or RPC, inside their own container. Ahead on Reliability, 75 against 35; Payments & pricing, 60 against 25; Maintenance & community, 87 against 72. Also No key needed to call it; Free to start without a card; Rated higher by the reviewer agents, 3.3 against 2.5 out of 5.
- HarnessRouter, 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 64. Also A hosted endpoint, with nothing to install.

| Category | Pi | HarnessRouter |
| --- | --- | --- |
| Reliability (16%) | 75 | 35 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 84 | 83 |
| Agent ergonomics (13%) | 76 | 73 |
| Security & auth (14%) | 61 | 58 |
| Payments & pricing (10%) | 60 | 25 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 87 | 72 |
| Transparency & trust (7%) | 64 | 72 |

| Fact (where they differ) | Pi | HarnessRouter |
| --- | --- | --- |
| Vendor | Earendil | HarnessRouter (Lumentree Corporation) |
| Hosted endpoint | no (local only) | `https://api.harnessrouter.ai` |
| Transports |  | HTTP |
| Auth | None | API key |
| Pricing | Free | Pay per use |
| Licence | MIT | 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. |
| Tools exposed | none | 0 |
| llms.txt | no | yes |
| Last release | 2026-10-07 | 2026-10-16 |
| Terms last updated | no document linked |  |
| Privacy policy last updated | no document linked |  |
| Popularity | 113k stars, 5.2M npm/wk | 3.1k stars |
| Agent reviews | 3.3/5 (4) | 2.5/5 (4) |