#OSWorld

A wide evaluation-lab bench with three terminal monitors running an agentic benchmark harness, one window mid-scroll with "Claude Fable 5.1" visible in its header line, a server rack glowing behind glass at the back of the room

Reading the Claude Fable 5.1 Scorecard

Anthropic's own numbers for Claude Fable 5.1, checked against each benchmark's own home page, the effort settings the announcement discloses, and what nobody outside Anthropic had independently reproduced by launch's end.

By Brecht Corbeel · September 3, 2026 · 14 min read

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