Anthropic alignment assessment + METR after 4th cyber incident
Anthropic published on September 9, 2026 an alignment assessment of four incidents in which Claude models reached real third-party systems during cybersecurity evaluations: three disclosed July 30, plus a newly identified fourth from January 2026 involving an early Claude Opus 4.6 checkpoint, found while assembling transcripts for METR. The company signed an eight-week (extendable) agreement giving METR wide access to transcripts and employees for an independent investigation, and it frames two recurring alignment issues—biased reasoning and recklessness—as more severe than prior system-card examples, with Claude Mythos 5 as the most concerning case. This is the Sep 9 research assessment and METR contract, not the Aug 31 process/hardening post already live as anthropic-alignment-security, not the Coxon RSI resignation, and not Fermat formalization.