You drag a shirt off the rack onto your photo and you are wearing it. No button, no menu, no page anyone programmed in advance.
That is Runway's demo for Solaris. There is no code underneath. Every frame is drawn as you move the mouse.
Fact
The facts: on 31 August 2026 Runway introduced Solaris, the first model in a new family the company calls Interface World Models. The model generates the interface itself, frame by frame and in real time, according to the user's actions, without an intermediate representation such as code. Solaris builds on the Gen-4.5 video model, adapted to generate frames sequentially and in few steps; the goal is real time and 720p quality. A language model decides how the scene evolves, and Solaris renders it. In Runway's own user study with 250 participants, 30 examples and nearly 7,500 pairwise judgments, Solaris was preferred over a coded result from Claude Opus 5 in 61 per cent of comparisons for following the request (24 per cent for the code, 13 per cent equal) and in 71 per cent for natural behaviour in the scene (21 per cent for the code). Runway lists legible text, trust, long sessions and accessibility for assistive technologies such as screen readers as unsolved. For now the model is available only through an early-access request.
Where the real test is
Not in the shirt, and not in the salad you assemble by dragging ingredients into a bowl. In the list of what Runway says it cannot do yet. Text comes first. An interface without stable legible text is a picture, not a tool: a price, a pay button, terms and conditions - exactly where a mistake costs money.
A convincing wrong answer is worse than no answer. Runway writes that itself.
As a designer I see the other side too. The whole craft of interfaces rests on predictability: the button is where it was yesterday. Solaris goes the opposite way, because every time it may look different. For a shop window or a game that is a gift. For a banking app it is a headache.
The research is serious and the numbers come with honest caveats. As a working tool it is early. Runway itself points to the online storefront as one of the places for it, and that is where the first real test will be.
The visual is generated code-art, no third-party images.