I don't have much experience with using LLMs to help write code, but I gave Jules a try on a new, very unorganized Python project I recently started. About 800 lines of code. It need a major refactoring, so I simply asked Jules to make suggestions.

At a cursory glance, it did a great job. It failed the first time. I gave it the error message and it fixed it. I was shocked it ran after that. Not bad for the free plan.