Kling 4.0 vs Veo 3.1 Fast
Kling 4.0 from Kling AI and Veo 3.1 Fast from Google, compared on what you can feed them, what they output and what they cost here.
Updated October 30, 2026
The short answer
- Veo 3.1 Fast has the lower starting price: 9 credits/s (720p, 8s) against 18 credits/s (720p, 3s) for Kling 4.0. At the same resolution the gap can be smaller; see the table below.
- Kling 4.0 makes longer clips: up to 30 seconds, Veo 3.1 Fast up to 8.
- Veo 3.1 Fast goes up to 4k; Kling 4.0 tops out at 1080p.
- Audio: Kling 4.0 none (silent video), Veo 3.1 Fast always included.
- Kling 4.0 accepts reference videos; Veo 3.1 Fast does not.
- Only Kling 4.0 takes reference images (up to 9) for characters, products or style.
Specs side by side
| Kling 4.0 | Veo 3.1 Fast | |
|---|---|---|
| Developer | Kling AI | |
| Inputs | text to video, first and last frame, up to 9 reference images | text to video, first and last frame |
| Reference uploads | 9 images, 3 videos | none |
| Resolutions | 720p, 1080p | 720p, 1080p, 4k |
| Length | 3–30 seconds | 4, 6, 8 seconds |
| Aspect ratios | auto, 21:9, 16:9, 1:1, 9:16 | 16:9, 9:16 |
| Audio | none (silent video) | always included |
| Lowest price | 18 credits/s (720p, 3s) | 9 credits/s (720p, 8s) |
Price for a short clip
Kling 4.0: 90 credits for 5 seconds at 720p. Veo 3.1 Fast: 40 credits for 4 seconds at 720p. Every price for every length and resolution is on each model's page; plans and credit packs are on Pricing.
Credits per second at each resolution
| Resolution | Kling 4.0 | Veo 3.1 Fast |
|---|---|---|
| 720p | 18 credits/s | 10 credits/s |
| 1080p | 26 credits/s | 11.3 credits/s |
| 4k | not offered | 30 credits/s |
At the shortest length. Models that bill per video work out cheaper per second on longer clips.
Which should you choose?
Choose Kling 4.0 if
- you need clips longer than 8 seconds
- you want to guide motion with a reference video
- you want to keep a character or product consistent from reference images
Choose Veo 3.1 Fast if
- you want the lower price per second
- you need 4k output
- you want sound generated with the video
Run Kling 4.0 and Veo 3.1 Fast on the same prompt
One prompt, the same images, video and audio, up to 4 models at once. Each model is charged its own credits; failed videos are refunded.
Models to compare (2/4)
FAQ
Is Kling 4.0 or Veo 3.1 Fast better?
It depends on the shot. Veo 3.1 Fast has the lower starting price: 9 credits/s (720p, 8s) against 18 credits/s (720p, 3s) for Kling 4.0. At the same resolution the gap can be smaller; see the table below. Kling 4.0 makes longer clips: up to 30 seconds, Veo 3.1 Fast up to 8. The fastest way to decide is to run your own prompt on both: the comparison tool sends the same prompt and references to each model at once.
Which is cheaper, Kling 4.0 or Veo 3.1 Fast?
A 5-second 720p Kling 4.0 video costs 90 credits; a 4-second 720p Veo 3.1 Fast video costs 40 credits. Higher resolutions and longer clips cost more, and failed videos are refunded.
Can I use the same reference images with Kling 4.0 and Veo 3.1 Fast?
Kling 4.0: 9 images, 3 videos. Veo 3.1 Fast: none. On the comparison page, inputs a model can't take grey it out instead of sending a job that would fail.
Do Kling 4.0 and Veo 3.1 Fast generate sound?
Kling 4.0: none (silent video). Veo 3.1 Fast: always included.
Which is better for vertical TikTok or Reels videos?
Both can make vertical video when 9:16 is in their aspect ratios. Kling 4.0: auto, 21:9, 16:9, 1:1, 9:16. Veo 3.1 Fast: 16:9, 9:16. "Set by the model" means it frames the video from your input image.
Can I try Kling 4.0 and Veo 3.1 Fast on the same prompt here?
Yes. The comparison tool on this page has both models selected: write a prompt, add the same images or reference video if you like, and press Generate. Each model is charged its own credits, and you can add up to two more models.
Sources
Specs and prices come from the models as offered in our generator (updated October 30, 2026). Makers' pages: Kling AI, Veo 3.1.