I have the same experience. Every time I try to have it code something that isn't completely trivial or all over the internet like quicksort, it always has bugs and invents calls to functions that don't exist. And yes, I'm using GPT-4, the best model available.

And I'm not even asking about an exotic language like F#, I'm asking it questions about C++ or Python.

People are out there claiming that GPT is doing all their coding for them. I just don't see how, unless they simply did not know how to program at all.

I feel like I'm either crazy, or all these people are lying.