if its remote initially, closed eye interviews where you just have a discussion might be easiest way. Pretty easy to tell if someone is bullshitting if they can't discuss topics that likely should excite them somewhat, or at the very least topics they've been around for years.

Feel like any test nowadays should INCLUDE ai, but you likely just want insight into how they are getting from A to B. I don't wanna assume what you mean by cheating with AI, could be as simple as answering live questions with cheating software or whatever, which is obviously a huge issue. I wanna respond and say it should be expected for any take home type stuff, and be rolled into the expectations if anything, but that could be way off of what you mean.

both sides of the entire process is just a nightmare now, one side has all this noise to sift through, and the other side is pressured to mass apply because of all the competing noise they can't be seen through. I was listening to something about AI generated responses, and they seemed to have no empathy for the people who gave human responses, but used AI to give them an overview of the company and what it does for the question "why do you want to work at x?", and sorta mocked the person because they can tell they asked for a generic description of what the company does.

There has to be some give and take, initial applications if you are spending hours researching a single company, you are setting yourself up to be absurdly let down if that same company sends you an automated rejection within a day. A reasonable person will only do that so many times, before just giving up and waiting for the other side to be the first mover instead.