Runway

Solaris is Runway's first Interface World Model, a real-time system that generates interactive interfaces frame by frame with no code underneath. The idea is to collapse the usual pipeline where a visual design gets translated into code before it can respond to a user. Instead, Runway pairs its Gen-4.5 video model with an LLM that reads each click or drag and decides what should happen next , streaming the resulting interface as live video. It targets designers, product teams, and agent developers who want interfaces that can adapt to intent rather than sit frozen behind pre-built screens. The launch matters because Runway is staking out generated software as the next surface for its world models, extending work that began with GWM-1 and Gen-4.5. In a user study of 250 participants across 30 interaction examples, Runway reports that Solaris was preferred over a Claude Opus 5 coded baseline in 61% of comparisons for instruction following and 71% for natural behavior within a scene. The company also frames Solaris as a training ground for agents, arguing that today's LLMs struggle with basic computer-use tasks because they overfit to specific layouts, and a constantly regenerated interface forces more general behavior. Runway was founded in 2018 by Cristóbal Valenzuela, Anastasis Germanidis, and Alejandro Matamala, with Valenzuela as CEO , and the team is releasing Solaris in early access with selected partners rather than as a general product. Known limits are worth flagging for anyone evaluating it: stable text rendering, factual grounding for commercial use, and coherence across long sessions all remain open problems that Runway acknowledges in its research note.