#watermarking

Tagged watermarking · show all articles

A red-team evaluator's desk at night with a refusal-trace log scrolling on the main screen above a printed evaluation checklist, one line item caught mid-tick with the pen still resting on it

The Safety Ledger of Claude Fable 5.1

Anthropic shipped Fable 5.1 and Mythos 5.1 today with numbered safety claims attached — 85% fewer biology false positives, 60% fewer cyber ones, an invisible EU watermark. Each traced to its source.

By Brecht Corbeel · September 3, 2026 · 13 min read

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