Anthropic Disables Fable After U.S. Export Directive
Anthropic disabled its Fable 5 and Mythos 5 models worldwide on June 12, 2026, after the U.S. Commerce Department issued an emergency export-control directive barring access by any foreign national. Anthropic received the directive at 5:21pm ET; access to all other Anthropic models was not affected. The government cited a reported jailbreak technique; per Anthropic's blog post, the technique essentially consists of asking the model to read a specific codebase and fix any software flaws. Fortune cites cybersecurity consultant Katie Moussouris describing a simple prompt workflow that converted model outputs into actionable vulnerability tests. Anthropic characterized the jailbreak as narrow and non-universal, said the underlying capability is available in other publicly deployed models including GPT-5.5, and disputes the shutdown scope while complying with the directive. Tom's Hardware reports Trump adviser David Sacks said Anthropic refused to fix the jailbreak before export controls were applied. Business Insider reports a UK founder lost mid-project access and avoided major disruption only because he had a backup plan.
