Research threads argue that harness design can swing benchmark performance dramatically and propose automating harness engineering with agentic search, reframing agent performance as model plus harness rather than weights alone.
Changing the harness around a fixed LLM can produce a 6x performance gap on the same benchmark.
The work introduces Meta-Harness, an agentic system that searches over harness code
Agent = Model + Harness. The model reasons. The harness does
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