# Ask HN: Is Claude Fable 5 built from scratch or just better data? > Source: > Published: 2026-06-12 11:35:58+00:00 | |||||||||||| 1 point by | I am trying to understand why Claude Fable 5 is different, is it a new architecture, or trained from scratch or just a better fine tuning on top of Opus 4.8? Why is it labeled as new type of model with a version 5? We don't have Fable-4, what does it compare to? | ||||||||||| |