Runway Gen-4.5 is a video model dropped on Dec 1, 2025. It’s the latest from Runway, following Gen-1 through Gen-4. They say it’s now their main system for making video from text, images, and other inputs.
It’s built to turn short text prompts or mixed inputs like reference images or keyframes into high-def video clips. People can use it to make quick cinematic stuff or test scenes fast for ads or media work.
Runway says Gen-4.5 beats Gen-4 in a few big ways. Motion looks more natural, with objects and people moving more like in real life. Scenes hold up better over time, with less weird morphing or drifting. There's tighter control over things like lighting, movement, and style.
Even with those upgrades, it still runs about as fast as Gen-4. It scored 1,247 Elo points on a benchmark, putting it at the top for AI video tools.
What you get are HD clips that look pretty cinematic, with steady characters and realistic movement.
It also supports different ways to create. You can guide the output using images, keyframes or even other videos. That gives you more say in how it looks and flows.
If you'd like to access this model, you can explore the following possibilities:
