Harness-Delta Attribution: Dissecting Gains From Harness Evolution

Explain Like I'm Normal

Researchers have introduced Harness-Delta Attribution (HDA) to measure whether agent improvements come from genuine reasoning or just benchmark-specific prompt tuning. By testing across 11 models, they've created a framework to distinguish between 'artifact-driven' wins and actual generalizable intelligence. This provides a reality check for builders who mistake high test scores for robust model performance.