US government forces Anthropic to disable Fable 5 and Mythos 5 worldwide
Anthropic abruptly disabled Fable 5 and Mythos 5 on June 13 after the US government issued an export control directive at 5:21 PM ET. The order bans access for any foreign national anywhere, including those in the US and Anthropic's own foreign employees. Anthropic says compliance is impossible without a full shutdown. The government cited a jailbreak method that found a few known, minor vulnerabilities. Anthropic pushed back, stating that other public models like OpenAI's GPT-5.5 can do the same, and defenders already use these capabilities daily. The post does not disclose the jailbreak's technical details or the full directive text. The author, an AI risk worrier, is conflicted: he agrees optimizers can go dangerously wrong, but finds this ban's justification weak.
Why it matters: Anthropic shutting down flagship models due to a government export control order is an industry-shaking event. HKR all hit: high conflict, concrete new info, direct developer impact. Slight discount for a personal blog as the source rather than an official statement, but the f...