An AI that has enough sense of self-awareness to not hallucinate and to recognize the borders of its knowledge on its own. That is fundamentally impossible to do with LLMs because in the end, they are all next-token predictors while humans are capable of a much more complex model of storing and associating information and context, and most importantly, develop "mental models" from that information and context.
And anyway, there are other tasks than text generation. Take autonomous driving for example - a driver of a car sees a person attempting to cross a street in front of them. A human can decide to slam the brake or the gas depending on the context - is the person crossing the car some old granny on a walker or a soccer player? Or a human sees a ball being kicked into the air on the sidewalk behind some cars, with no humans visible. The human can infer "whoops, there might be children playing here, better slow down and be prepared for a child to suddenly step out onto the street from between the cars", but an object detection/classification lacks that ability to even recognize the ball as being a potentially relevant piece of context.