Fable 5.5 needs to be affordable.
Fable 5.1 was incredible, but it died in 30 minutes on a $200 Max plan. I haven't touched it since Opus 5.5 came out.
Opus 5.5 is amazing because you can actually use it all day on a subscription.
The smartest model in the world doesn't matter if you can't afford to use it.