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Runway · Video model
Gen-4.5
runway/gen-4.5- Video
Runway Gen-4.5 is a video generation model from Runway for text-to-video and image-to-video workflows. It is designed for cinematic scene creation with strong motion quality, visual fidelity, and prompt adherence....
Specifications
- Durations
- 2, 3, 4, 5, 6, 7, 8, 9, 10 s
- Resolutions
- 720p
- Aspect ratios
- 16:9, 9:16
- Sizes
- 1280x720, 720x1280
- Start from an image
- first frame
- Edit a video
- no
- Audio
- none
- Seed
- supported
Use it
POST /api/v1/videos · MCP generate_video · get_video · full reference
# 1. submit (202 with id, token, poll_url)
curl https://omnirail.org/api/v1/videos \
-H "Authorization: Bearer $OMNIRAIL_KEY" -H "Content-Type: application/json" \
-d '{"model":"runway/gen-4.5","prompt":"a paper boat drifting down a rainy street, slow dolly in","duration":2,"resolution":"720p","aspect_ratio":"16:9"}'
# 2. poll every ~30 s until status is "completed"
curl https://omnirail.org/api/v1/videos/$JOB_ID -H "Authorization: Bearer $OMNIRAIL_KEY"