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Claude Fable 5.1 decoded a centuries-old royalist message hidden in plain sight since 1653

AITopTools Editorial TeamSeptember 3, 2026

What changed

Anthropic’s Claude Fable 5.1 appears to have solved a centuries-old number puzzle that researchers had considered unsolved. The puzzle contained a royalist message hidden in plain sight since 1653.

What this means for you

The result suggests AI may help researchers examine difficult historical puzzles, but the supplied information does not say whether Claude Fable 5.1 is publicly available or how reliably it performs similar tasks.

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