METR’s August 2024 evaluation update describes expanding its task set, using human completion time to organize difficulty and weighting task families to limit domination by families with many variants. It examines how success changes with additional agent time and where progress levels off under a simple harness. Sparse human baselines and the mixture of easy and hard tasks limit interpretation. The reusable lesson is that an aggregate score depends on task composition, weighting, stopping behavior and scaffolding, not just the model.
Agent benchmarks: inspect task weighting and budget-dependent failure
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