Introduction
A practical guide to using Runway Gen-4.5 in our Media Generator: options, credits per duration, prompt tips, and best practices.
Runway Gen-4.5 is a professional-grade text-to-video model. In our platform, it supports:
- Text-to-video — Generate video from prompts (no image required)
- 5 or 10 seconds — Short clips
- 720p resolution
- 16:9, 9:16, 1:1 aspect ratios
- Industry-standard quality — Strong for ads, creative work
Use it when you need high-quality, professional-looking video.
Where to Use Runway Gen-4.5
| Location | How | |----------|-----| | Media Generator | Tools → Media Generator → Video tab → select "Runway Gen-4.5" | | Image-to-video projects | Create a project and select Runway Gen-4.5 for video generation |
Platform Options
Duration
| Option | Credits | |--------|----------| | 5s | 1.50 | | 10s | 3.00 |
Default: 5s
Resolution
720p only
Aspect ratio
| Option | Best for | |--------|----------| | 16:9 | Landscape | | 9:16 | Portrait, Stories | | 1:1 | Square |
Default: 16:9
Costs (credits)
Runway Gen-4.5 uses per-second pricing:
| Duration | USD | Credits | |----------|-----|----------| | 5s | $0.60 | 1.50 | | 10s | $1.20 | 3.00 |
Rate: $0.12/second
\*Credits computed with default billing config. Check the model selector for current rates.
Prompt Guidelines
Do
- Describe specific motion — “camera slowly zooms in,” “leaves fall”
- Specify visual style — “cinematic,” “commercial,” “filmic”
- Include lighting — “soft backlight,” “neon-lit”
- Mention camera movement — “steadicam,” “static shot”
Avoid
- Vague descriptions
- Conflicting camera or motion instructions
- Overly complex multi-scene prompts
Tips & Tricks
- 5s for tests — Half the cost; iterate before 10s.
- Clear camera direction — Runway responds well to explicit camera language.
- Style keywords matter — “cinematic,” “4K” can improve output feel.
- One focal action — Single clear subject/action often works best.
- 9:16 for ads — Portrait fits mobile and Stories.
Limits and Constraints
| Constraint | Value | |------------|-------| | Durations | 5s, 10s | | Resolution | 720p only | | Aspect ratios | 16:9, 9:16, 1:1 | | Reference image | Not required |
Troubleshooting
| Issue | What to try | |-------|-------------| | Unexpected style | Add explicit style and lighting terms | | Cost concerns | Use 5s; compare with Pruna for drafts | | Model not available | Confirm Replicate API token is configured | | Motion too fast/slow | Refine motion description in prompt |