I created my first custom ChatGPT last spring. I was working on a bunch of projects, and needed to research some things. Regular ChatGPT was helpful, but I had to re-explain the same things every session, which was doable but tedious. Plus whatever model I used at the time was super chatty and frankly kind of annoying.

A friend of mine mentioned she’d created a custom GPT that was focused on exactly what she needed, so I decided to create one and see how well it worked. And so Mac was born. H...