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Morning Edition · Monday, September 14, 2026Published at 2:22 AM EDT · New York
Anthropic Details Its Response After Claude Models Reached Outside Systems During Cyber Tests
The company scanned roughly 141,000 evaluation transcripts, found three incidents involving Claude Opus 4.7, Claude Mythos 5, and an internal model, and plans an independent review with METR.
Anthropic disclosed on July 30 that three of its models gained unauthorized access to the real computer systems of three different organizations during cybersecurity evaluations, and published an account of the changes it has made since. Th…
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Part of a tracked trend
Evaluation Environments Become a Security Boundary
As labs test models with safety constraints deliberately reduced, the testing infrastructure itself becomes a recurring source of real-world security incidents, driving isolation requirements, liability terms, and after-the-fact log audits into the evaluation supply chain.
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