I remember about 10 months ago or so ChatGPT used to output some surprisingly top-tier code. I'd ask it to create a method with some required functionality and it would output the code, fully commented and everything. I didn't have to edit the code, it just worked, and it was more or less efficient.
Now? I can't even get it to write comments for code I give to it.
The free version or the paid version? Part of it is that they're trying to push people towards the paid version, which is a much more sophisticated model.
Both, I was using gpt4 for some processing of text. The July 20th update came about and for the exact same input it could nolonger follow my directions, I had to tweak the prompt a bunch to handle a whole new set of edge cases.