Maybe some sort of paid interview where actual work is done. Like give them a real task to complete to demonstrate their ability to do that task (and then go over it with them to see if they know what is going on with it to rule out using an AI to do something they don't understand).

Or have technical people handle the technical parts of the interview, people that will recognize when someone gives an answer to a problem that isn't on the answer key but is actually the best answer they've seen for that question. I bet there's tons of stories where some clueless HR person rejected someone because they were smarter than the answer key but the HR person had no idea and just marked them wrong. Except the stories don't get told because neither party has enough information to realize just how idiotic the scenario was.