Anthropic Disables Claude Fable 5 and Mythos 5 After US Government Order
Anthropic disabled its Claude Fable 5 and Mythos 5 models following a US government export control directive on national security grounds. The company maintains the government order stems from a misunderstanding regarding a "jailbreak" claim, which Anthropic argues is narrow and not a universal bypass of safeguards.
Anthropic disabled its Claude Fable 5 and Mythos 5 models on June 12, 2026, just three days after their launch. This action followed a US government export control directive that cited national security concerns. The order specifically named both models and suspended access for all foreign nationals.
Because Anthropic could not filter foreign nationals from US users in real time, it shut down both models globally to ensure compliance. Access to all other Anthropic models, including Claude Opus 4.8, remains unaffected. The company views the situation as a likely misunderstanding, suggesting the government
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