It can help out a lot in writing base systems. I wanted to learn rust and made gpt write a game with me, it really could handle more complex things than I thought. For example it wrote a diablo style rotatable inventory system (cli, no graphic) which impressed me a lot.

Another game prototype i had lying around in react i asked Jules to refactor to use event sourcing rather than mutating values and I only had to give it a few pointers on what it had missed. It even found an old bug I had missed.

I guess nothing of it was really math heavy but that inventory grid was really solid