From my experience it's a mixed bag. Sometimes it works perfectly. It wrote a simple graphics game in javascript in the first try, from just one prompt. Funny thing, I don't know much about JS or HTML. In another try it failed to create simple python program using opengl. Never managed to point camera at (0,0,0). Had problems with rotations. Did only 2 instead of 3. And so on in spite of me trying to correct. It was complete failure. Another case, python working with text files, did a great job. That was something useful.