Claude Fable 5.1: A Deep Technical Dive into the Model That Doubled Agentic Benchmarks — and Baked a Watermark Into Your Code
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The cipher story — Vals.ai used Claude Fable 5.1 to crack a 373-year-old royalist cipher in 44 minutes, spending roughly 176,000 tokens without human intervention and recovering a plaintext that fit both the poem’s structure and its historical context: “O GOD UPHOLD KING CHARLS THE SECOND AND / MAK…
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- 2026-09-18 05:29 · DEV Community — Machine Learning
Claude Fable 5.1: A Deep Technical Dive into the Model That Doubled Agentic Benchmarks — and Baked a Watermark Into Your Code