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US government forces Anthropic to disable Fable 5 and Mythos 5

US government forces Anthropic to disable Fable 5 and Mythos 5The New Stack

On June 12, 2026, the US government issued a national-security export directive forcing Anthropic to disable its Fable 5 and Mythos 5 models globally due to a specific jailbreak. Anthropic complied, switching all users back to Opus, leaving the models suspended indefinitely.

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Jun 13, 9:09 PM
US government forces Anthropic to disable Fable 5 and Mythos 5 — AIBriefs