Anthropic releases Claude Fable 5 with strong capabilities; system card flags bioweapons competence and worrying reasoning behaviours
X-Risk Daily
Friday 12 June 2026
Transformative AI
On 9 June 2026, Anthropic publicly released Claude Fable 5, a Mythos-class AI model that the company had previously restricted to a limited group of cybersecurity defenders and critical infrastructure providers.
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Generated automatically from 11 sources including Transformer, Sentinel, Epoch AI, LessWrong, and EA Forum.
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