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BriefAI

Runway Launches Gen-4: Real-Time Video Generation in Your Browser at 60fps

Runway's Gen-4 model goes live, delivering browser-based, real-time video generation at 60fps with an 8-second max clip length for free users and 120 seconds for Pro.

Runway dropped Gen-4 on the AI community this week, and the benchmark numbers are turning heads. The latest iteration of Runway's flagship video generation model can now produce 1080p video clips at a steady 60fps directly in the browser — no local GPU required. Free tier users get up to 8-second clips; Pro subscribers stretch to 120 seconds with 4K upscaling thrown in.

The underlying architecture uses a new streaming diffusion approach that generates frames incrementally rather than producing a full clip in memory, which is what made previous browser-based attempts feel sluggish and low-resolution. Gen-4 also introduces a style consistency engine that keeps characters and environments visually coherent across cuts — a known pain point with earlier generation tools.

The tool is already being used by over 400,000 creators in its first 72 hours, according to Runway's CEO. A commercial API is expected before the end of October.