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October 21, 2026

US government forces Anthropic to pull Fable 5 and Mythos 5 over jailbreak concern

Also: Anthropic-backed bill would require court order to block risky AI models‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ 

X-Risk Daily

Wednesday 21 October 2026

Transformative AI
US government forces Anthropic to pull Fable 5 and Mythos 5 over jailbreak concern
On the evening of 12 June 2026, three days after their public launch, the US government ordered Anthropic to immediately shut off access to Claude Fable 5 and Claude Mythos 5, citing national security concerns.

Also in this issue

Transformative AI
Anthropic-backed bill would require court order to block risky AI models
Transformative AI
Anthropic overhauls safety policy, admits regulation and unilateral action aren't keeping pace
Transformative AI
Unprotected agentic hacking platforms found operating openly online
Transformative AI
Anthropic publishes new constitution shaping Claude's values and training
Research
Researcher trains model to detect when its own activations are being probed
Research
Physicists say AI model corrected experts' answers on unpublished-problem benchmark

… and 64 more in the full briefing

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