The US Government Banned Anthropic's Fable 5 AI. I Tried It Before It Disappeared

Anthropic’s Mythos model isn’t publicly available because it’s apparently too powerful . So, Anthropic took the core of Mythos, made it “safe for general use,” and released it widely as Fable 5. However, the US government quickly took it down , citing security concerns. Before it got banned, I put Fable 5 to the test, and I can confirm that it's an impressively intelligent AI model, even compared with GPT-5.5 and Opus 4.8. Still, if it comes back online, you still might not want to use it because of its hefty price tag and few benefits for everyday chatbot interactions. Here’s the full story. I Made a Warframe Build Planner App with Claude AI Why Fable 5 Was Pulled—and What Happens Next On June 12, 2026, the US government issued an export control directive to Anthropic , requiring the company to suspend all access to Fable 5 and Mythos 5 by foreign nationals. This even includes some Anthropic employees. Given the difficulty of auditing the citizenship of every Claude user with access to Fable 5 or Mythos 5, Anthropic immediately cut off access to both models pending a resolution of the government’s directive. The company argues that Fable 5's many safeguards effectively prevent its use for malicious purposes. Anthropic reportedly didn’t get a specific reason for the ban from the government but believes it’s related to a recently discovered jailbreak. The ability to bypass a software’s safeguards to use it for things not otherwise allowed is always concerning from a security standpoint and is especially dangerous in the case of Fable 5. Currently, Claude displays a message that Fable 5 is unavailable, and you can't select it from the model selection dropdown menu (Credit: Anthropic/PCMag) However, upon review of a demonstration of this jailbreak, Anthropic claims that the outlined vulnerabilities are neither new nor significant. The company also maintains that other publicly available models can discov