I've been surprised. I have a coworker who has a deep industry knowledge but none of it was in Perl, he was reaching for ChatGPT a lot early on and while sometimes it wasn't how I would have written it it wasn't wrong. So I did some experiments and I asked Claude to do things like generate apps using the latest Class syntax which is only 3 years old at this point … it didn't have a problem.

Edit: well it occasionally had a problem where it would confuse things for Moose or Raku … but by and large it wasn't wrong it's just the syntax is new. I know Perl developers who have the same issues.