US Government Orders Anthropic to Pull Claude Fable, Mythos AI Models

In brief

• The U.S. government ordered Anthropic to suspend access to its two most advanced AI models, Fable 5 and Mythos 5, citing a national security concern over a potential jailbreak vulnerability.
• Anthropic complied but disputed the finding, arguing the vulnerability is simple and already replicable using other publicly available models like GPT-5.5.
• The company warned the directive sets a…