Also, for whatever software engineering work I throw at Fable 5, Opus 5 also does fine. Apparently Fable is supposed to do better at long running tasks (in other words - burning more tokens without interacting with the user), but that's not the kind of work I'm doing.

After Fable 5 launched, it was better than Opus 4.8 for sure. Then they rug-pulled Fable from me (EU), and later released Opus 5. Now I only reach for fable when Opus 5 API returns 529 for the millionth time this year.