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Morning Edition · Saturday, August 22, 2026Published at 2:18 AM EDT · New York
Scale AI Benchmark Measures Whether Models Can Rewrite Another Agent's Harness
Across 111 scored runs, the choice of optimizer model separated results more than the coding harness the optimizer worked through, and native harnesses were not consistently better than a shared one.
Scale AI published HarnessOpt-Bench, a benchmark for automated harness optimization. In the setup, an optimizer, defined as a large language model paired with a coding harness, is given a target agent's starting harness, graded feedback on…
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Part of a tracked trend
The Harness Becomes the Capability Layer
An increasing share of measured agent capability comes from orchestration code rather than model weights, so expect harness-aware benchmarks, harness-specific pricing, and disputes over how much of any announced gain belongs to the model.
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