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Anthropic upgrades Claude Fable and Mythos for demanding technical work
Anthropic released Fable 5.2 and Mythos 5.2, variants of the same underlying model with different safeguards and access. Fable is available broadly; organizations seeking Mythos for qualifying cyber or life-science work must apply for verification. Anthropic reports improvements in coding, reasoning and vision, which remain its benchmark claims.
Primary source · Anthropic · November 9, 2026
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