I spend much more time refactoring that creating features (though, it is getting better with each model). My go-to approach is to use Claude Code Opus 4.6 for writing and Gemini 3.1 Pro for cleaning up. I feel that doing it just one-stage is rarely enough.

A lot of prompts about finding the right level of abstraction, DRY, etc.

An earlier example (Opus 4.5 + Gemini 3 Pro) is here: https://github.com/stared/sc2-balance-timeline

I tried as well to just use Gemini 3 Pro (maybe the model, maybe the harness) it was not nearly as good as writing, but way better at refining.