many people think opus 4.6 was the best

Not weird at all, given the variance in Opus' quality over the last few months.

wild guess - I wouldn't be surprised if Opus 4.6 was run quantized for a while, and 4.7/4.8 have QAT for that nerfed size.

Where is the weird part?

Hello! Author here (Katie) Ty for your comments, 4.6 and 4.7 both scored 28% on our benchmark, I just wanted to have 10 things in the list because I wanted a round number.