Arena.ai Launches HarnessTax: Quantifying How Much the Harness Matters for Coding Agents
solyarisoftware · x · 2026-10-02
Arena.ai published HarnessTax, a study page tackling a key question in coding-agent evaluation: how much does the harness itself matter?
It quantifies how different orchestration harnesses affect the measured coding performance of the same underlying model, addressing whether benchmark scores come from the model or the scaffolding around it.
The page presents visual comparisons across harnesses and could serve as a useful reference for developers choosing or building agent harnesses. The tweet author praised it as surprisingly good.
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