Tested muse spark 1.2 because it was rated so high on design arena, and I've missed a model that can do nice UI in the hands of an operator with no UI skills.

It produced worse UI mockups than GPT and GPT models are already the bottom of the barrel here. The only model that performed well was Kimi K3 - insanely good, but expensive.

It's hard to trust benchmarks these days.

I found the sweetspot here: GPT-5.6 Sol (high) 57.3 $0.52 7,545

(Edit: TLDR; It gets on with it, makes the same mistakes you would, without overthinking and overengineering, most of the time)