Runway launched Solaris on August 31, an Interface World Model that predicts and renders application interfaces frame by frame after each user action, without writing code.
It pairs Gen-4.5 and GWM-1, splitting LLM reasoning from rendering. Runway's own 250-person study found Solaris preferred over Claude Opus 5-coded interfaces in 61% of instruction-following and 71% of natural-behavior comparisons, but coverage noted the results apply only to selected examples and do not establish production reliability. No code, API, or pricing has been released, and Runway calls it an early research system.