The US government issued an export-control directive to Anthropic on June 12, 2026, citing a security concern related to Fable 5 and Mythos 5's ability to analyze code for vulnerabilities. This directive, aimed at restricting access for foreign nationals, led Anthropic to shut down both Fable 5 and Mythos 5 globally for all users. While the directive specifically targeted foreign nationals, Anthropic's compliance measures resulted in a complete shutdown of these models, affecting even US-based users. Other Anthropic models, like Opus 4.8, remain unaffected. AI
IMPACT Government export controls on AI models can lead to widespread service disruptions, impacting global access and development.
RANK_REASON A government directive led to the shutdown of specific AI models, impacting a major AI provider. [lever_c_demoted from significant: ic=1 ai=1.0]
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