ScaleAI's HarnessOpt-Bench evaluates LLMs at optimizing agent harnesses
ScaleAI · hf · 2026-08-07
ScaleAI introduces HarnessOpt-Bench for end-to-end harness optimization under expensive stochastic evaluation. An optimizer LLM edits a target agent's seed harness within a budget. Evaluating 5 frontier LLMs across 4 tasks (111 runs), results show optimizer models separate more than coding harnesses, native harnesses aren't consistently superior, and gains vary. Establishes harness optimization as a measurable capability.
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