[AINews] Fable and Mythos officially too dangerous to release
US government directive forced Anthropic to suspend Claude Fable 5 and Mythos 5 over a disputed jailbreak risk.
“the government has only given us verbal evidence of a potential narrow, non-universal jailbreak”
Anthropic abruptly revoked access to its newly released Claude Fable 5 and Mythos 5 models following a US government directive citing a national cybersecurity jailbreak risk that the company disputes. The suspension affected all customers worldwide and downstream products like Devin and Agent Arena, reframing closed frontier APIs as a 'model sovereignty' risk and reigniting open-source AI advocacy.