I'm just pointing out a personal observation. Completely anecdotal. FWIW, I don't strongly believe this. I have at least noticed a selection bias (maybe) in myself too as recently as yesterday after GPT 5.1 was released. I asked codex to do a simple change (less than 50LOC) and it made a unrelated change, an early return statement, breaking a very simple state machine that goes from waiting -> evaluate -> done. However, I have to remind myself how often LLMs make dumb mistakes despite often seeming impressive.