Only because they have compressed and encoded the entire sum of human knowledge at their disposal. There are models for everything in there, but they can only do what has been done before.
What's more amazing to me is the average human, only able to hold a relatively small body on knowledge in their mind, can generate things that are completely novel.
What's more amazing to me is the average human, only able to hold a relatively small body on knowledge in their mind, can generate things that are completely novel.