The Differences Between Chat GPT and the Human Brain

How similar is the way that a system like chat GPT works to the way that the human brain works? And how is it different? I think there's two ways of thinking about that question. One is when we look at the system as it's been trained and sort of the behavior that it's producing, how does that behavior compare to what humans do? The other question is how does the system learn? How does it get to the point that it's got to from all of the data that it's using?