Claude Fable 5 vs Opus 4.8: Is Double the Price Worth It?

Fable 5 costs 10 dollars per million input tokens against 5 for Opus 4.8, output is 50 vs 25 SWE-Bench Pro gap is 11.1 points, and FrontierCode more than doubles at 29.3 vs 13.4 Same API surface with one new 400: explicit thinking disabled rejects on Fable 5, omit the field Cache minimum drops to 20