METR · November 5, 2026

METR’s acceleration assessment: distinguish trends from causal attribution

Why it matters

METR’s October 2026 Anthropic assessment finds faster progress on measured capabilities, while emphasizing uncertainty about causal attribution and real-world generalization. Much of the evidence informing its conclusions was redacted. Its public methodology separates historical, current and counterfactual growth and tests sensitivity to benchmark modeling choices; the counterfactual is not directly observed.

My takeaway: For an AI productivity or capability assessment, record baselines, alternative explanations and sensitivity analyses. Distinguish measured trends from interview-based attribution and forecasts. Maintain an evidence-access ledger so reviewers can see which conclusions depend on material they cannot inspect.
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