Harness Arena: Open-Source Blind Benchmark Pits Claude Code, Codex and Other Agent Harnesses Head-to-Head
Due_Armadillo_8744 · reddit · 2026-09-02
A Reddit developer released Harness Arena, an MIT-licensed open-source blind benchmark for comparing agent harnesses — Claude Code, Codex, Hermes, OpenClaw, OpenCode and more — on controlled tasks.
Key design:
- Each harness gets the identical task in an isolated workspace
- Outputs are anonymized; users judge actual deliverables blind, identities revealed afterward
- The author is soliciting harness integrations, task datasets, and feedback on benchmark methodology
It targets an underexplored layer: judging the orchestration/tooling wrapper rather than the raw model.
Related event: Harness Arena: Open-Source Blind Benchmark for Coding Agents(2 posts)→
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