US-based Anthropic suspended its frontier models "Claude Fable 5" and "Claude Mythos 5"—released in June 2026—for all users on June 12 following US government export controls, then restored Fable 5 on June 30 after adding safety measures. General users, including those in Japan, gained access from July 1, while the restricted Mythos 5 remains available only to US government and corporate clients.
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