I only use Fable when "knowing about more stuff" is important (like research, exploring ideas), but I find Opus 5.5 writes and expresses itself more clearly and is reliable for anything I throw at it, so I use it much more.

It's possible Fable is better, but since it word salads more quickly, it's hard to tell.

I find Fable 5.1 output to be borderline unreadable. Opus 5.5 on the other hand has been a pleasure to work with.

I've found its worse in most tasks, especially when ranked on a cost-per-task metric.

Fable 5.1 is good for better knowledge and tasks that require a more meticulous output, and it's objectively better at design and mockups IMO, but I rarely resort to it outside of that.

I generally use Fable for high-level blueprinting, architecture, and technical planning, and I tell it to write most of its documentation in a way Opus 5.5 will understand and maximally benefit from; with the added prompt for Opus to concede when a task would be better off to bring Fable back in. I've had ZERO problems.

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