Claude Opus 5.5 is painting by writing code for each brushstroke. In Stillwet, the model works with simulated oil paint, brushes, and a linen canvas. It can mix pigments, apply paint, then look at the result and decide what to change. Some preferences keep showing up. Asked to plan a painting of its own choosing, Opus picked a jug with lemons six times out of six. You can watch the paintings take shape through live sessions and replays, with notes on recurring subjects, mistakes, and…