What humans do 99% of the time is not unlike the "dumb" kind of thinking that GPT does. It is only deep thought, in which a human develops true cause-and-effect understanding, that currently sets us apart.

Also, GPT has emergent behavior that the research team did not expect. And it is able to score a 700 on the math SAT - which requires a significant level of "understanding" - that's true problem solving. It is not just mimicking.