US government orders Anthropic to shut down its strongest models, Fable 5 and Mythos 5

美国政府要求Anthropic关闭最强Claude模型Fable 5和Mythos 5

The US Commerce Department issued an export control order last Friday requiring Anthropic to shut down Fable 5 and Mythos 5. The trigger was a jailbreak that let the models provide cybersecurity help they were supposed to refuse. Commerce Secretary Howard Lutnick said export restrictions will apply to users outside the US and foreign nationals inside the US until national security systems are strengthened, which could take weeks. Anthropic responded that the jailbreak technique is narrow, only a few small known flaws were found, and other public models can offer similar capabilities. Because the company cannot verify user nationality in real time, it had to disable the models for everyone, including internal international team members. Anthropic also noted the industry cannot yet achieve perfect jailbreak resistance—all safeguards remain vulnerable to non-universal jailbreaks.

Why it matters: First-ever US export-control order to shut down specific AI models, triggered by a jailbreak safety incident. This is an industry-defining event every outlet will cover tomorrow. Not a 100 because we only have the tweet so far — waiting on Anthropic's official statement and Co...