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Summary of METR's predeployment evaluation of Claude Opus 5.5

Note on independence: This evaluation was conducted under an unpaid agreement for AI R&D assessment. 1 We drafted the initial summary, and then Anthropic had the opportunity to review and edit the text. We signed off on this final text from the Claude Opus 5.5 system card . Our preliminary evaluati…

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  1. 2026-09-22 07:00 · METR
    Summary of METR's predeployment evaluation of Claude Opus 5.5

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