Literally someone (or, at least, some thing) that can figure things out as problems arise? That seems quite generous. Unless you're solving a "problem" that has already been solved a million times before, it won't have a clue. These so-called AIs are predictive text generators, not thinking machines. But there is no need to solve a problem that is already solved in the first place, so...

It is really good at being a "college professor" that you can bounce ideas off of, though. It is not going to give you the solution (it fundamentally can't), but it can serve to help guide you. Stuff like "A similar problem was solved with <insert research paper>, perhaps there is an adaptation there for you to consider?"

We're long past a world where one can solve problems in a vacuum. You haven't been able to do that for thousands, if not millions, of years. All new problems are solved by standing on the shoulders of problems that were solved previously. One needs resources to understand those older problems and their solutions to pave the way to solving the present problems. So... If you can't use the tools we have for that during the interview, all you can lean on is what you were able to memorize beforehand.

But that doesn't end up measuring problem solving ability, just your ability to memorize and your foresight in memorizing the right thing.