Can you please specify whether you use (paid) GPT-4? Would you kindly provide links to a few examples of very fundamental things incorrect?

My experience - the free version made up a lot of things but still felt very useful - enough to want to upgrade to the paid version. With the paid version, I notice very rarely that it hallucinates. It does make errors but it can correct them when I provide feedback. It is possible that I just do not notice the errors you would notice, it is also possible that we use it differently. I would like to know.