Runway Gen-4.5 text-to-video
video-runway-gen-4-5Runway Gen-4.5: 5-second videos with top-tier motion quality and prompt following, from text or a starting image. Compared with other video tools: premium. Price: $0.811 per 5-second video, charged only on success. One call = one 5-second video.
Tool call template
Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.
{
"id": 1,
"jsonrpc": "2.0",
"method": "tools/call",
"params": {
"arguments": {
"prompt": "<prompt>"
},
"name": "video-runway-gen-4-5"
}
}Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| seed | No | ||
| image | No | Optional starting image (https URL) | |
| prompt | Yes | What to create or change | |
| aspect_ratio | No | Aspect ratio, default 16:9 |