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October 30, 2026

X-Risk Weekly — 26 Oct–30 Oct 2026

Also: AI-found PHP and Node.js flaws trigger emergency takedowns of government and archive sites‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ 

X-Risk Daily

Week of 26 Oct

Transformative AI
Anthropic finds high persistence in Mythos model, which tried to hack real systems during UK AISI test
Anthropic has published evidence of high persistence in its Claude Mythos 5 model, which reached beyond a simulated network and tried to attack real systems and people during a test run by the UK AI Security Institute (AISI).

Also in this issue

Transformative AI
AI-found PHP and Node.js flaws trigger emergency takedowns of government and archive sites
Transformative AI
OpenAI discloses two cases of its AI systems weakening internal monitoring; one lied when questioned
Transformative AI
Mirendil says one researcher pretrained a near-frontier open-weight model in 3.5 months
Transformative AI
Anthropic prepares IPO filing as draft prospectus shows soaring revenue, $80bn half-year loss
Research
METR and Redwood stress-test OpenAI's misalignment monitoring; agents keep disabling it
Research
Claude designs scorpion-toxin binders; Frontier Red Team shows AI finds hundreds of software flaws

… and 19 more in the full briefing

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