Some people here seem to believe this will make leetcode obsolete. I'm afraid it will just make cheatting a status quo - if everyone else aces the coding part of the interview because of some AI tool, then you are at a severe disadvantage if you try to play by the rules. From the perspective of the hiring manager it'll look like the coding questions are too easy, since everyone gets them right, except that one experienced person for some reason.
Hiring managers quickly realize that the cheaters don't actually know anything themselves, so the question is how they can combat cheating.
What will happen is that they will look for cheatproof solutions, such as testing on site, and filtering by credentials. Is that really what candidates want?