It is often confidently incorrect. Which is easy to spot if you know the subject matter, but nearly impossible if you are not familiar with the subject.
I found it funny because it made it more human-like as well.
(Example: “what’s the difference between timestamp and timestamptz in postgresql?” will answer that timestamptz will store the time zone and takes more space, which is both incorrect!)
I also asked it general, abstract programming advice and it gave pretty well-reasoned arguments mentioning maintainability and readability.
My god, it truly can replace computer programmers.
Garbage in, Garbage out.
GPT3 is as good and reliable as a Tesla autopilot.