I do not think I'd personally gain much currently, other than saving a few dollars by using a third party inference provider.

The Fable quota on the $200 personal plan could be higher, but the difference to Opus 5 or 5.6 Sol is not large enough to gain any real benefit from unlimited access to Fable, for my use.

From what I heard their internal 'Model 2' is hardly much better, but hopefully they will have something newer soon.