RunwayMLpremiumText → VideoImage → Video
Gen-4.5
runwayml/gen-4.5
Estimated
$0.60 / 5s @ 720p
Video generation supporting both text-to-video and image-to-video with customizable duration, aspect ratio and content moderation controls.
720p/1080p 2–10s Pixel ratios
Aspect ratio uses pixel dimensions (e.g. 1280:720).
Input schema
The exact fields accepted by this model. Values are validated before a generation starts.
promptstringrequiredText prompt describing the video.
Range: 1 — 1000
image_inputimageImage for image-to-video: HTTPS URL, Runway URI or data URI.
ratiostringrequireddefault: "1280:720"Resolution / aspect ratio in pixels.
1280:720720:12801104:832960:960832:11041584:672durationintegerrequireddefault: 5Clip length.
Range: 2 — 10
seedintegerControls reproducibility. Leave empty for a random seed.
Range: 0 — +∞
Default values
{
"ratio": "1280:720",
"duration": 5
}