Runway Gen-4.5
Runway's flagship video model with realistic physics and strong visual fidelity for text-to-video and image-to-video.
Gen-4.5 is a cloud video-generation model built by Runway. It produces short video clips from a text prompt or a starting image. Clips run up to 10s at 720p. It also supports seed control. It runs through Runway, OpenRouter, Runware, and Replicate using your own API key, from about $0.12 per second of output.
- Released
- Dec 2025
- Pricing
- $0.12 per second
- Max resolution
- 720p
- Aspect ratios
- 16:9, 9:16, 4:3 +3 more
- Clip length
- Up to 10s
- Image-to-video
- Start frame
- Seed control
- Supported
- Text to video rank
- #27
Samples
Generated with Gen-4.5 via Runware. The same two prompts run against every video model in the catalog (one landscape, one portrait), so the only thing that changes between two models’ clips is the model.
Camera motion, scene coherence over time
Fluid motion, fine detail, temporal stability
Runway
Runway builds the Gen family of generative video models, pioneering high-fidelity text-to-video and image-to-video for filmmakers and creators.
runwayml.com ↗Runway's Gen-4 image model with strong prompt adherence and tag-based reference images for consistent characters, styles, and scenes.
Runway's fastest Gen-4 image model: generates from one to three tagged reference images for consistent characters, styles, and scenes at a fraction of Gen-4 Image's cost.
Runway's fast, low-cost Gen-4 image-to-video model: animates a start frame into a 2 to 10 second clip.
Runway's video editing model: restyles, relights, or changes a 2 to 30 second source clip from a text prompt, with an optional first-frame keyframe and outpainting to a new aspect ratio.