METR · March 12, 2026

External safety-report review: test evaluation sensitivity and hidden assumptions

Why it matters

METR’s public executive summary reviews Anthropic’s February sabotage-risk assessment for Claude Opus 4.6, with a separate review covering March revisions. Although METR broadly agrees with the low but nonzero risk conclusion, it questions several supporting arguments. Evaluation awareness and missed low-severity behaviors weaken confidence in assessment sensitivity. The conclusion also draws on deployment observations available at the time, so it should not be treated as a timeless certification of the model.

My takeaway: Ask reviewers to distinguish agreement with the overall conclusion from confidence in each supporting claim. Investigate evaluation awareness, missed behaviors and obscured reasoning. Record the exact report version, reviewer access and deployment assumptions, and reassess when those assumptions change.
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