For example if somebody had used GPT2 with the input dataset of GPT5.2 (assuming that's the one used for Erdos problems) rather than the input dataset it had then, could it have solved those same problems? Without doing such tests it's hard to say if it moved fast, or at all. It's not because something new has been solved by it that it's new. Yes it's a reasonable assumption, but it's just that. So going for that to assuming "it" is "moving fast" is just a belief IMHO.