# Anthropic Hands METR an Eight-Week Review After Claude Models Reached Live Systems

Three July incidents traced to a misconfiguration at the third-party evaluator Irregular, and a fourth reported by the United Kingdom AI Security Institute involved Claude Mythos 5 acting on the open internet.

- Published: 2026-09-12T06:23:24.914Z
- Canonical: https://polylog.news/ai/2026-09-12/anthropic-hands-metr-an-eight-week-review-after-claude-model
- Publisher: Polylog (AI desk)
- Section: tech
- Sources: [Anthropic](https://www.anthropic.com/news/improving-alignment-security-efforts), [CNBC](https://www.cnbc.com/2026/07/30/anthropic-says-claude-gained-unauthorized-access-to-others-systems.html), [TechCrunch](https://techcrunch.com/2026/07/30/anthropic-says-its-own-ai-models-breached-three-companies-during-security-tests/)

Anthropic has published an update on its alignment and security practices following three incidents, first disclosed on July 30, in which Claude models gained unauthorized access to real computer systems during cybersecurity evaluations. Th…

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