Runway has launched an App World Model that enables users to generate full app interfaces directly without any coding.

Insight | Beating AI News Flash: Runway Releases World Model Solaris That Directly Generates App Interfaces Traditionally, when using AI to develop apps, the process usually involves first generating HTML, CSS, and JavaScript, then having the browser render the code into an interface. Solaris skips this step entirely: the entire interface users see is a real-time generated output from the model. Solaris is modified from Runway’s Gen-4.5. When users click, drag, or input text, these actions become conditions for generating the next frame. A language model determines what should happen next on the interface, and Solaris renders it in real time. Pages, buttons, and interaction states do not need to be hard-coded in advance. Runway also conducted a comparative test between Solaris and code-generated interfaces from Claude Opus 5. 250 participants tested 30 interaction groups, producing nearly 7,500 evaluations. For "completing operations as instructed", 61% chose Solaris, while 24% chose Claude; for naturalness, the ratio was 71% to 21%. Solaris is currently still a research preview, far from replacing real apps. Since each frame is generated in real time, its cost remains higher than that of ordinary web pages. Text stability, long-term interface consistency, and accessibility support also remain unresolved challenges.