Anthropic cuts global access to Fable 5 and Mythos 5 amid US export-control directive

Anthropic disabled access to its newest top-tier AI models, Fable 5 and Mythos 5, after a US government directive tied to export controls. Multiple outlets report that the company shut off use globally, while its other models remained available ^{[1] [2]}.

The halt contributed to market fallout for Anthropic, with one report saying pre-IPO shares fell as the US government moved to pull access to what it described as its most powerful AI model(s). Separately, coverage also framed the action as part of a broader export-control push that could increase compliance and regulatory uncertainty for AI deployments ^{[3] [4]}.

Anthropic’s global shutdown of Fable 5 and Mythos 5 underscores the near-term impact of US export-control enforcement on advanced AI product availability and related market expectations ^{[1] [3]}.