EventPolicyJune 15, 2026

US orders Anthropic to restrict Fable 5 and Mythos 5 models

On June 12, the US government ordered Anthropic to block foreign access to its Fable 5 and Mythos 5 models, citing potential cyberattack risks. Anthropic complied by shutting down access for all users, stating they disagree with the decision but are following the legal directive.

4 sources

US orders Anthropic to restrict Fable 5 and Mythos 5 models — AIBriefs