Fable is inappropriate for the vast majority of tasks (yes, including yours!), and it is quite obnoxious. Opus 5.5 writes concisely and almost sounds like a human.
Because if true, I see no reason to spend that extra money, but for me Fable clearly outperformed Opus on complex tasks. (Including giving the same task and compare results)
8hs of “prompt engineering” daily for a year or so.
I find Fable immensely better than 5.5 in their capabilities and results. Opus makes mistakes, a lot and big. Both on High Effort.
I just run Fable for literally everything including daily random use. Never run out of tokens on the 100 plan.