Overall I think 5.6 Sol Pro/Ultra etc. seems to be a substantial step up from 5.5 for math. That said, common interaction pattern is: I ask a question. It thinks for ~100+ minutes and returns a largely inscrutable response. I ask it to explain. It thinks for 20 minutes and says:

@littmath i am not on pro, but it can't follow simple instructions like wrapping certain symbols with \text command when writing latex. no matter how many times you repeat this, it will continue to commit the same mistake. no such problem with claude. but i like sol's content better