Runway has unveiled Solaris, the first model in a new category it calls 'Interface World Models.' ^[1] Instead of running code, the Solaris system generates the user interface frame by frame as users interact with it. ^[2] Runway wants the 'app' as a fixed unit to disappear, proposing that operating systems generate the right interfaces on their own rather than relying on a catalog of prebuilt applications. ^[3] The model renders the interface itself in 720p resolution and responds to clicks, drags, or voice commands. ^[4] In an evaluation across 7,500 pairwise judgments and 30 interaction examples, 250 participants preferred Solaris over coded interfaces for better adherence to instructions in 61% of comparisons. ^[5] Runway argues that conventional visual interfaces require designers and developers to translate designs into code and define interactions in advance, a step Solaris aims to bypass entirely. ^[6] Runway states that 250 participants preferred Solaris for behaving more naturally within the scene in 71% of comparisons against coded interfaces. ^[7]