Essentially, choosing when it was going to use what model/reasoning effort on its own regardless of my preferences. Basically moved to dumber models while writing code in between things, producing some really bad results for me.

Anecdotal, but the reason I will never talk about Cursor is because I will never use it again. I have barred the use of Cursor at my company, It just does some random stuff at times, which is more egregious than I see from Codex or Claude.

ps. I know many other people who feel the same way about Cursor and other who love it. I'm just speaking for myself, though.

ps2. I hope they've fixed this behavior, but they lost my trust. And they're likely never winning it back.