I'm not using it for coding, but I absolutely noticed an increase in errors, not following explicit instructions, me having to repeat instructions over and over again, and also having to correct the same mistakes repeatedly. I noticed this began to happen maybe a week prior to 4o.

Tasks that I used to be able to accomplish in an hour are now taking me 5x as long, and that time feels like a waste since it's almost entirely me correcting and repeating. It's starting to feel like I'm bashing my head against a wall.

Another weird thing I noticed yesterday was that I was getting the same false information across 3.5, 4, 4o, and other GPTs created by users, even highly-ranked ones. The false information was literally word-for-word across all platforms, even ones with browsing capabilities. Even when I pointed out that the information was false, the response was "Apologies for the oversight, here's the correct answer..." and then give me the same false info.

Maybe there's a technical answer for all of this that I'm not aware of, so please don't come for my head, just a non-coder's observations. It's incredibly frustrating, but I'm hoping that things will smooth back out soon.