Understanding the general sanity of some of their responses. Synthesizing new ideas. Having a larger context. AI tends to be idiot savants on one hand and really mediocre on the other.
You could argue that this is just a reflection of lack of training and scale but I wonder.
You will change my mind when I have had a machine interaction where the machine does not seem like an idiot.
Edit: AI people call the worst of these hallucinations but they are just nonsensical stuff that proves AI knows nothing and are just dumb correlation engines.