Runway Gen-4.5
Announced 2025-12-01; added to Runway API 2026-02-10 (text-to-video and image-to-video, 2-10 s). Cheaper sibling gen4_turbo (5 credits/s). gen4_aleph and gen3a_turbo removed from API 2026-07-30. Requires header X-Runway-Version: 2024-11-06.
- Input
- text, image
- Output
- video
- License
- proprietary
- Pricing
- per second: $0.12 (per second of video (12 credits/s at $0.01/credit; pro/HDR formats extra)) source
- Verified
- 2026-09-29
How to call it
| Provider | Model id | Endpoint / URL | Docs |
|---|---|---|---|
| Runway API | gen4.5 | https://api.dev.runwayml.com/v1/image_to_video | docs |
| Web app | — | app.runwayml.com | — |
Notable capabilities (2)
- #1 on Artificial Analysis text-to-video at launch: Launched as the top model on the Artificial Analysis Text-to-Video leaderboard (1,247 Elo), with better physics (liquids, momentum, collisions). source
- HDR and professional output formats (found after launch): API can output ProRes, PNG/EXR sequences, 10-bit SDR and HDR10/HLG/ACEScg masters (Gen-4.5 only for HDR). source
Runway's flagship text/image-to-video model. Runway's API also resells third-party models (Veo, Seedance, etc.).
curl -X POST https://api.dev.runwayml.com/v1/image_to_video -H "Authorization: Bearer $RUNWAYML_API_SECRET" \
-H "X-Runway-Version: 2024-11-06" -H "Content-Type: application/json" \
-d '{"model":"gen4.5","promptText":"a drone shot over a misty fjord","ratio":"1280:720","duration":5}'
# poll GET https://api.dev.runwayml.com/v1/tasks/{id}
Sources: https://docs.dev.runwayml.com/guides/models/ , https://docs.dev.runwayml.com/guides/pricing/ , https://docs.dev.runwayml.com/api-details/api_changelog/ , https://runway.com/research/introducing-runway-gen-4.5