Anthropic blocks all public access to Claude Fable 5, Mythos 5 following US government order — what enterprises should do
The US government last night issued an unprecedented export control directive ordering Anthropic to immediately suspend all access to its top-tier Claude Fable 5 and Claude Mythos 5 models for foreign nationals, citing unspecified national security authorities.
In response, Anthropic has blocked all public access to both models, globally — meaning no users around the world can access them at this time, even paying enterprise customers and Anthropic employees internally. It's a huge blow and reversal following the public release of Fable/Mythos 5 just three days prior.
Current Fable 5/Mythos 5 sessions will end in errors and new queries will be automatically routed to older, less capable models like Opus 4.8. Anthropic says in a blog post that "We believe this is a misunderstanding and are working to restore access as soon as possible," and apologizes to its customers.
The sudden regulatory intervention serves as a stark warning to the...
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