I made a zero ads SERP using one of these "AI first" search providers: https://github.com/scosman/froogle (live version https://froogle.fyi). In this case Keenable.ai. Generally the same pattern: it's not usable.
Interesting, I've been using keenable a lot and I've had no noticable issues with it. Prior to this, I was using the brave search API.
It's okay but not great. I'm always annoyed grokipedia outranks wikipedia. And some queries return the definitive link at position 5/6 behind grokipedia and other slop.