I somehow take the opposite on almost everything here.

4.8 xhigh or max has a slight edge on 5.5 xhigh, for very complex logic perhaps it loses but it's just better in almost every other way, especially code quality. GPT is a slop machine outputs way too much and over-abstracts, plus its communication is so bad in comparison.

Fable was for sure a step above GPT, I tried them both against a few of the same hard tasks and it was not a small difference.