TL;DR
- Runway Gen-4.5 is billed per second on HiAPI: $0.1715 per second for both text-to-video and image-to-video. That's $0.8575 for 5 seconds, $1.372 for 8 and $1.715 for 10.
- Output is always 720p. There are no resolution tiers, so only length moves the price. Aspect ratio and the first frame cost nothing extra.
- It's live on HiAPI: open the text-to-video model page and generate right away. New accounts get 200 free credits.
Price table
| Length | Text-to-video runway-gen-4.5/text-to-video | Image-to-video runway-gen-4.5/image-to-video |
|---|---|---|
| Per second | $0.1715 | $0.1715 |
| 5 s | $0.8575 | $0.8575 |
| 8 s | $1.372 | $1.372 |
| 10 s | $1.715 | $1.715 |
HiAPI price, checked October 19, 2026.
Failed tasks aren't charged. $10 buys about 11 five-second clips.
One catch: vertical 9:16 text-to-video comes in 5 and 10 seconds only, with no 8. Image-to-video offers all three lengths at every aspect ratio.
Real clips at each length
All 720p. Here's what each length is good for:
5 seconds, $0.8575: one action and one camera move.
A street dancer spins under a single streetlight at night, light rain, camera slowly circles, cinematic
Generate with this prompt → (pick 5 s and 9:16)
runway-gen-4.5/text-to-video, 9:16, 720×1280, 5 s, $0.8575.
8 seconds, $1.372: enough for one slow rise or pan.
the balloons drift upward as the camera slowly pans
Generate with this prompt → (upload a first frame, pick 8 s and 9:16)
runway-gen-4.5/image-to-video, 9:16, 720×1280, 8 s, $1.372. The first frame is a 2816×1584 landscape photo, center-cropped to vertical.
10 seconds, $1.715: a full reveal from near to far.
Aerial glide over a misty rice-terrace valley at sunrise, camera slowly rises to reveal distant mountains
Generate with this prompt → (pick 10 s and 16:9)
runway-gen-4.5/text-to-video, 16:9, 1280×720, 10 s, $1.715.
How to spend less
- Draft at 5 seconds. Especially for fast action: get the pose and camera right before paying for 8 or 10.
- Pay for the seconds you need. 8 seconds saves $0.343 over 10 when one camera move is the whole shot.
- Pick any aspect ratio. Landscape, vertical and square cost the same.
- Add sound in the edit. Clips are silent, so music and voice-over go on in post anyway.
Compared with Kling 2.5 Turbo, Kling 3.0 Turbo and Veo 3.1 Lite
| Model | Per second | 5 s | 10 s | Lengths | Resolution | Audio |
|---|---|---|---|---|---|---|
| Runway Gen-4.5 | $0.1715 | $0.8575 | $1.715 | 5 / 8 / 10 s | 720p | None |
| Kling 2.5 Turbo | $0.06 | $0.30 | $0.60 | 5 / 10 s | ~1080p | T2V always on, I2V none |
| Kling 3.0 Turbo | $0.13 (720p) / $0.16 (1080p) | $0.65 / $0.80 | $1.30 / $1.60 | 3–15 s | 720p / 1080p | Always on |
| Veo 3.1 Lite T2V | from $0.06 (720p, silent) | no 5 s option | no 10 s option | 4 / 6 / 8 s | 720p / 1080p | On or off |
- Runway Gen-4.5 has the highest per-second price here, about 2.86× Kling 2.5 Turbo. What it adds is the 8-second option.
- At 10 seconds: Kling 2.5 Turbo $0.60, Kling 3.0 Turbo at 720p $1.30, Runway Gen-4.5 $1.715. For same-prompt clips from the two new models, see Runway Gen-4.5 vs Kling 2.5 Turbo.
Monthly budget
| Clips per month | 5 s each | 10 s each |
|---|---|---|
| 100 | $85.75 | $171.50 |
| 1,000 | $857.50 | $1,715 |
| 10,000 | $8,575 | $17,150 |
Budget = clips × seconds × $0.1715.
FAQ
Can I pay more for 1080p?
No. Runway Gen-4.5 on HiAPI has one resolution, 720p, and one price. For 1080p, look at Kling 2.5 Turbo or Kling 3.0 Turbo.
Is image-to-video more expensive than text-to-video?
No. Both are $0.1715 per second, and the first frame is free.
Are failed tasks charged?
No. You only pay for videos that finish successfully.
Is 8 seconds available at every aspect ratio?
On image-to-video, yes, all five. On text-to-video, vertical 9:16 offers only 5 and 10 seconds.
For code, read the Runway Gen-4.5 API guide. For ready-made prompts, see Runway Gen-4.5 prompts. To spend your first $0.8575, copy the dancer prompt above and run it on the model page.
