Anthropic Suspends Claude Fable 5 and Mythos 5 Worldwide After US Export Directive

Anthropic confirmed on June 13 that the US government, invoking national-security and export-control authorities, issued a directive suspending all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign-national Anthropic employees. Rather than attempt to partition access by nationality, the company disabled the models globally — ending the three-day public life of Fable 5, which had launched June 9 as the first Mythos-class model offered to all customers (1M-token context, up to 128K output tokens, built for long-horizon agentic work).

The stated trigger was a jailbreak concern: officials reportedly demonstrated a bypass of Fable 5's safeguards. Skeptics, including Simon Willison, noted the same 'jailbreak' was apparently never tried against Opus 4.x or GPT-5.x, suggesting the action was singling out Anthropic rather than addressing an industry-wide flaw. Anthropic said it has so far received only verbal evidence from the government, fueling questions about due process.

The move is unprecedented: a US regulator forcing a domestic lab to deny its own frontier models to large swaths of its workforce and global user base. Commentators framed it as a chilling precedent for an industry whose talent pool is heavily foreign-national. The community reaction was immediate and intense — r/singularity's 'America starts regulations' hit 2,040 upvotes and r/Anthropic openly debated relocating HQ to the EU.

Watch next: the outcome of Anthropic's Washington negotiations, whether the directive expands to other labs, and how AWS/Azure customers who built on Mythos-class models on Bedrock are affected.