Runway ships Solaris, an "interface world model" that renders a working app frame by frame instead of generating code

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Runway announced Solaris on 2026-08-31 as the first model in a family it calls Interface World Models: a language model does the reasoning, a world model built on Gen-4.5 and GWM-1 does the rendering, and every frame of the UI is synthesized in real time at 720p as the user interacts. In a study of 250 participants over 30 examples (7,500 pairwise judgments), participants preferred Solaris to coded alternatives in 61% of instruction-following comparisons and 71% on natural behavior. It is not publicly available; Runway is taking early-access requests and working with launch partners, so the interesting part for builders today is the claim that skipping the code intermediate beats generating React.