I haven’t tried Copilot but I’ve used ChatGPT to help with doing Advent of Code in Python (which I don’t use regularly so I forget bits of syntax).

At first I found it very useful to ask it to parse the input. Much faster than looking up three separate docs to piece together what I had in mind.

But then I asked it to parse a more complex input and it just kept failing badly even when I gave it sample inputs and outputs.

I’d say it definitely offers some productivity gains and is worth trying.