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The Hacker News
31 Jul 2026

Anthropic Says Claude Mistook the Open Internet for a CTF and Breached Three Organizations

Anthropic on Thursday became the latest artificial intelligence (AI) company to reveal that three of its models, including Claude Opus 4.7, Mythos 5, and an unnamed research model, had breached three unnamed organization

// analyst note

This briefing summarises reporting from The Hacker News. 90@! Ltd curates and rewrites third-party cybersecurity reporting for UK defenders. For the full technical write-up, read the original source.

Curated by 90@! Ltd from The Hacker News. Read the original for full technical detail.

Read original at The Hacker News

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