Runway's Solaris renders a working app frame by frame instead of generating code.

Announced August 31 as the first Interface World Model: a language model reasons, a world model built on Gen-4.5 and GWM-1 renders, and every frame of the UI is synthesized in real time at 720p as the user interacts (Runway). 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 and Runway is taking early-access requests. I am skeptical of the durability of an interface with no source, but the preference numbers are real and the claim that skipping the code intermediate beats generating React deserves a fair test.