Is it just me or is the answer quality rapidly decreasing for the public models anyway (o-mini and whatever it degrades to) I am shopping things for a bigger D

Is it just me or is the answer quality rapidly decreasing for the public models anyway (o-mini and whatever it degrades to) I am shopping things for a bigger DIY project for a few months now and recently it started to hallucinate products with the specifications I need. In fact it returns mainly broken code, hallucinates functions that never existed (zero Google results) and so on. Not sure if I am using it more, or it just got much more useless.