It's a myth that GPT-4 can't say "I don't know." Often it will respond that it doesn't know something organically, but in cases where it's extra important to be

It's a myth that GPT-4 can't say "I don't know." Often it will respond that it doesn't know something organically, but in cases where it's extra important to be careful, it can be prompted to do so. It will always make the occasional mistake, as will the man on the street.