Fable 5 is back and that it is the newest model, designed to handle harder tasks with fewer interruptions.
The main point is about usage limits:
Until July 7, users can use Fable 5 with up to 50% of their weekly plan limit. If they reach the limit, they can keep using Fable 5 with usage credits.
It also says that Fable 5 consumes usage faster than Opus 4.8, meaning it is more powerful, but it uses more of your quota.
Enjoy