Anthropic AI Shutdown: US Ban Halts Fable 5 & Mythos 5

Anthropic has taken its two most powerful AI models, Fable 5 and Mythos 5, offline for all users globally. This shutdown happened after the Trump administration banned foreign nationals from using them. The Commerce Secretary sent a letter to Anthropic's CEO, stating that Fable 5 and Mythos 5 were subject to export restrictions. This rule prevents foreign governments, companies, and individuals, including foreign-born staff in the US, from using the models. Because so many users fell under this definition, Anthropic decided a full shutdown was the only clear way to comply. The company states the letter did not detail the national-security concern. Both models remain offline, with Anthropic calling the order a misunderstanding and working to restore access. This impacts critical industries that use Mythos to find software vulnerabilities. This situation highlights the growing tension between AI development and regulatory control.