It's mostly Go, some Python, and I'm not asking anything niche. I'm asking for basic utility functions that I could implement in 10-20 lines of code. There's something broken every single time and I spend more time debugging the generated code than actually writing it out.

I'm pretty sure everybody measures "failure rate" differently and grossly exaggerate the success rate. There's a lot of suggestions below about "tweaking", but if I have to "tweak" generated code in any way then that is a failure for me. So the failure rate of generated code is about 99%.