Unverified50% confidenceFactExact time
Although model evaluation scores are little affected by the harness, the cost per task differs significantly across harnesses.
1
Sources
50%
Confidence
Long-term
Relevance
10/22/2026
First Seen
Sources
Former Cursor Engineer: Is Agent Harness Dead? The Data Flywheel and Three Things the Model Can't Absorb
bilibili全球AI科技不费眼10/22/2026
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UnverifiedHarness2 uses grader-free relative evaluation, selecting the best through lateral comparison among candidate versions, without needing a ground-truth answer or an external grader.68% similarUnverifiedScores on the SWE-bench leaderboard reflect not only the strength of the model but also the engineering quality of the harness.66% similarUnverifiedPrompt length measures cost, not capability requirements; these are two fundamentally different dimensions.64% similarUnverifiedBoth the UC Berkeley and the Apple/EPFL studies found significant differences in per-task cost under different harness choices.64% similar
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