It's not very useful, unless you only want to write a single isolated class in Java. Every time I refine my prompt I get a completely different answer and often it just repeats answers it gave me earlier which wipes out improvements made in the meantime. It produces bad code faster than you can check it.
When you ask it to do something simple like chess it whips out crazy illegal moves. "the omnipotent f6 pawn" is already an internet meme [0]. You might now claim that it is a language model and it shouldn't be able to play chess but this is a very real limitation that you are going to pretend doesn't exist later on when it is about "language tasks". If it can't follow basic rules like rooks only moving horizontally or vertically or bishops only moving diagonally which is purely defined by logic then how on earth can it possibly do something that actually requires complex reasoning?
The problem with these large language models is that it gets harder and harder to notice the limitations, but they are still the same regardless of the size of the model. So every iteration you get to hype up more people about the same thing. They will make the same bad projections into the future like everyone else.
[0] https://www.reddit.com/r/AnarchyChess/comments/10yym4o/why_i...
(Context: ChatGPT will play pawn f6 which summons a pawn out of nowhere, beating the queen)