I have been using it for a long time now (relative to most users, I believe). When gpt-3 just came out I was using it, when the subscription was made available I immediately got it.
I can confirm with 100% certainty that it's been dumbed down/nerfed. The unpaid version was quite literally better than the paid version now. It doesn't understand many basic questions, is now HORRIBLE at editing (it usually can't detect grammar mistakes in anything longer than a few sentences, can't reword things without just regurgitating phrases in random order, can't make critiques and act based on them).
Gpt-3 was initially capable of doing iterative work flows, such as taking on programming projects. I'd tell it to brainstorm a project idea, then to make the project plan/outline, then the pseudocode, then the entire code, and it would do it all quite well.
Now even gpt-4 can barely provide a functional short program (much less with any guidelines provided to follow), it can't provide real advice or information, it mostly just throws out extremely vague responses and tells you to double check some other source/documentation or to speak to other people to find the answer.
People have been denying these things since the beginning which has droven my INSANE. So much gaslighting from these idiots who claim we just got too used to GPT's writing style. I don't know what I'm paying a subscription for at this point- this tool was helping me with so many things before and now it's quite literally easier to just fully do everything myself than to ask it anything. I actually make more mistakes asking for it advice than thinking on my own entirely.
I'm disgusted. I can understand ethical concerns and all that, but to just quietly throttle down even the paid subscription? Without a doubt they provide rich people and corporations a secret exclusive version that actually fricking works.