Will's Blog: Letter: the US says Anthropic "agreed to proactively detect and address security risks" of Fable 5 and Mythos 5; a source says Anthropic developed a "safeguard" (Financial Times)

1 July 2026

Letter: the US says Anthropic "agreed to proactively detect and address security risks" of Fable 5 and Mythos 5; a source says Anthropic developed a "safeguard" (Financial Times)

Financial Times:
Letter: the US says Anthropic “agreed to proactively detect and address security risks” of Fable 5 and Mythos 5; a source says Anthropic developed a “safeguard” — US government move allows AI start-up to re-release Mythos and Fable models

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