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Anthropic has globally disabled its experimental models Claude Fable 5 and Mythos 5 following a US government directive citing national security concerns regarding potential jailbreak vulnerabilities. This move effectively halts the deployment frontier for these specific architectures while leaving other standard Claude models operational, highlighting how geopolitical export controls can abruptly alter AI product roadmaps regardless of technical merit or user demand.
Why Anthropic suddenly pulled Fable 5 and Mythos 5 for everyone
Claude Fable 5 and Mythos 5 are gone. The reason? A US government directive.
Follow ZDNET: Add us as a preferred source on Google. Anthropic pulled Fable 5 and Mythos 5 worldwide. The US cited national security but gave few details. Anthropic said the jailbreak claim is narrow and disputed. As of 5:12 p.m. ET on Friday evening, Fable 5 and Mythos 5 are no longer available... to anyone, anywhere. To be clear, other Claude models are still available. According to an announcement by Anthropic, the "US government, citing national security authorities" issued an export directive requiring Anthropic to disable access to the two models by "any foreign national, whether inside or outside the United States, including foreign national Anthropic employees." The net effect was that Anthropic disabled Fable 5 and Mythos 5 for everyone, both inside and outside of the US. You can see the effect of that in my Claude Code session. When I launched the session with Claude Fable…
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