#claude-fable-5-1

1 post tagged with "claude-fable-5-1"

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ai building

Fable 5.1 vs Opus 5 in Production: A Whole Day on Fable Used 19% of a Max Weekly Window

Same harness, same day: 2,443 Fable 5.1 turns and 1,120 Opus 5 turns after a weekly reset consumed 19% of the Max weekly window, and the 5-hour window peaked at 59% without capping. Fable errored less per tool call, hit more permission gates, and would have cost 1.4x per turn on the API, not 2x.

Aug 8, 2026 · 14 min