Research Training And DistillationResearch Item

Meta Harness and automated harness engineering for agents

March 31, 2026elvis, alphaXiv, Huaxiu Yao

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
elvis
alphaXiv
Huaxiu Yao
harnessagentsbenchmarksllmautoresearchcoding agents

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