Ask HN: Why not compare Fable 5 with GPT "Pro"? Why compare with GPT xhigh?

Every benchmark I see compares the super model Fable 5 with GPT 5.5 xhigh, but that's not a fair comparison because GPT 5.5 Pro has existed for a while and consistently delivers better results than Opus 4.8 Max, so doesn't it make more sense to compare Fable 5 with GPT Pro, instead?

FYI, both of them take a long time to respond, as opposed to GPT xhigh which often returns in a couple of minutes.