Kling 4.0 Flash is the faster, lower-cost tier of Kuaishou’s Kling 4.0, limited to 720p and 20 seconds. On LeafReel it makes clips with stereo sound from text, a start photo or a reference video. A 5-second clip costs 220 credits, about $1.89 on Pro.
Is Kling 4.0 Flash free?
Not on LeafReel: each clip is priced by its length, and there is no free video allowance. You can still try LeafReel with one free 1K image (watermarked).
Kling 4.0 Flash vs Kling 4.0, Kling 3.0 Turbo and Seedance 2 Mini
On LeafReel, 5 seconds at 720p costs 220 credits on Kling 4.0 Flash, 333 on Kling 4.0, 211 on Kling 3.0 Turbo and 96 on Seedance 2 Mini. Flash and Kling 4.0 always add stereo sound. Kling 4.0 also offers 1080p, start and end photos and 30 seconds. Kling 3.0 Turbo is text-only here.
Base prices below exclude reference-video pricing, which depends on the uploaded video duration. Review the final credit estimate before generating.
| Model | Minimum price (credits) | Resolution | Duration | Sound | Reference inputs |
|---|---|---|---|---|---|
| Kling 4.0 Flash | 132 credits | 720p | 3–20 seconds | Yes | Up to 1 images, Up to 1 videos |
| Kling 4.0 | 200 credits | 1080p | 3–30 seconds | Yes | Up to 2 images, Up to 1 videos |
| Kling 3.0 Turbo | 127 credits | 1080p | 3–15 seconds | — | None |
| Seedance 2 Mini | 36 credits | 720p | 4–15 seconds | Optional | Up to 9 images, Up to 3 videos, Up to 3 audio files |
| Grok Video 1.5 | 45 credits | 1080p | 5–15 seconds | Yes | Up to 2 images |
How to use
- 01Write the promptDescribe the shot, the action and any dialogue or sound you want.
- 02Add a photo or a video if you wantUpload one start photo. Or add one reference video of up to 10 seconds, and the photo becomes a reference.
- 03GeneratePick the length and shape. Without a video, 10 seconds costs 439 credits and 20 seconds 878. With a video, its seconds are billed too.
Prompt tips
- Use Flash to test ideas, then remake the best one on Kling 4.0 at 1080p.
- Write dialogue in quotation marks if you want a character to speak.
- Describe music and sound effects in the prompt, because every clip has sound.
- Keep a reference video short: each of its seconds is billed with the output.
Key information
- Developer
- Kuaishou
- Type
- Video
- Reference inputs
- Up to 1 images · Up to 1 videos
- Duration
- 3–20 seconds
- Resolution
- 720p
- Aspect ratios
- 16:9, 9:16, 1:1, 21:9
- Sound
- On
- Minimum price
- 132 credits (≈ $1.13 Pro)
Credits per video
Base prices below exclude reference-video pricing, which depends on the uploaded video duration. Review the final credit estimate before generating.
1 credit is approximately $0.00857 on Pro, $0.01000 on Creator, and $0.01650 with the One Video pack.
| Resolution | Length | Shape | Generate sound | Credits | Pro equivalent | Creator equivalent |
|---|---|---|---|---|---|---|
| 720p | 3s | 16:9 | Sound on | 132 | $1.13 | $1.32 |
| 720p | 3s | 9:16 | Sound on | 132 | $1.13 | $1.32 |
| 720p | 3s | 1:1 | Sound on | 132 | $1.13 | $1.32 |
| 720p | 3s | 21:9 | Sound on | 132 | $1.13 | $1.32 |
| 720p | 4s | 16:9 | Sound on | 176 | $1.51 | $1.76 |
| 720p | 4s | 9:16 | Sound on | 176 | $1.51 | $1.76 |
| 720p | 4s | 1:1 | Sound on | 176 | $1.51 | $1.76 |
| 720p | 4s | 21:9 | Sound on | 176 | $1.51 | $1.76 |
| 720p | 5s | 16:9 | Sound on | 220 | $1.89 | $2.20 |
| 720p | 5s | 9:16 | Sound on | 220 | $1.89 | $2.20 |
| 720p | 5s | 1:1 | Sound on | 220 | $1.89 | $2.20 |
| 720p | 5s | 21:9 | Sound on | 220 | $1.89 | $2.20 |
| 720p | 6s | 16:9 | Sound on | 264 | $2.26 | $2.64 |
| 720p | 6s | 9:16 | Sound on | 264 | $2.26 | $2.64 |
| 720p | 6s | 1:1 | Sound on | 264 | $2.26 | $2.64 |
| 720p | 6s | 21:9 | Sound on | 264 | $2.26 | $2.64 |
| 720p | 7s | 16:9 | Sound on | 308 | $2.64 | $3.08 |
| 720p | 7s | 9:16 | Sound on | 308 | $2.64 | $3.08 |
| 720p | 7s | 1:1 | Sound on | 308 | $2.64 | $3.08 |
| 720p | 7s | 21:9 | Sound on | 308 | $2.64 | $3.08 |
| 720p | 8s | 16:9 | Sound on | 352 | $3.02 | $3.52 |
| 720p | 8s | 9:16 | Sound on | 352 | $3.02 | $3.52 |
| 720p | 8s | 1:1 | Sound on | 352 | $3.02 | $3.52 |
| 720p | 8s | 21:9 | Sound on | 352 | $3.02 | $3.52 |
| 720p | 9s | 16:9 | Sound on | 396 | $3.39 | $3.96 |
| 720p | 9s | 9:16 | Sound on | 396 | $3.39 | $3.96 |
| 720p | 9s | 1:1 | Sound on | 396 | $3.39 | $3.96 |
| 720p | 9s | 21:9 | Sound on | 396 | $3.39 | $3.96 |
| 720p | 10s | 16:9 | Sound on | 439 | $3.76 | $4.39 |
| 720p | 10s | 9:16 | Sound on | 439 | $3.76 | $4.39 |
| 720p | 10s | 1:1 | Sound on | 439 | $3.76 | $4.39 |
| 720p | 10s | 21:9 | Sound on | 439 | $3.76 | $4.39 |
| 720p | 11s | 16:9 | Sound on | 483 | $4.14 | $4.83 |
| 720p | 11s | 9:16 | Sound on | 483 | $4.14 | $4.83 |
| 720p | 11s | 1:1 | Sound on | 483 | $4.14 | $4.83 |
| 720p | 11s | 21:9 | Sound on | 483 | $4.14 | $4.83 |
| 720p | 12s | 16:9 | Sound on | 527 | $4.52 | $5.27 |
| 720p | 12s | 9:16 | Sound on | 527 | $4.52 | $5.27 |
| 720p | 12s | 1:1 | Sound on | 527 | $4.52 | $5.27 |
| 720p | 12s | 21:9 | Sound on | 527 | $4.52 | $5.27 |
| 720p | 13s | 16:9 | Sound on | 571 | $4.89 | $5.71 |
| 720p | 13s | 9:16 | Sound on | 571 | $4.89 | $5.71 |
| 720p | 13s | 1:1 | Sound on | 571 | $4.89 | $5.71 |
| 720p | 13s | 21:9 | Sound on | 571 | $4.89 | $5.71 |
| 720p | 14s | 16:9 | Sound on | 615 | $5.27 | $6.15 |
| 720p | 14s | 9:16 | Sound on | 615 | $5.27 | $6.15 |
| 720p | 14s | 1:1 | Sound on | 615 | $5.27 | $6.15 |
| 720p | 14s | 21:9 | Sound on | 615 | $5.27 | $6.15 |
| 720p | 15s | 16:9 | Sound on | 659 | $5.65 | $6.59 |
| 720p | 15s | 9:16 | Sound on | 659 | $5.65 | $6.59 |
| 720p | 15s | 1:1 | Sound on | 659 | $5.65 | $6.59 |
| 720p | 15s | 21:9 | Sound on | 659 | $5.65 | $6.59 |
| 720p | 16s | 16:9 | Sound on | 703 | $6.02 | $7.03 |
| 720p | 16s | 9:16 | Sound on | 703 | $6.02 | $7.03 |
| 720p | 16s | 1:1 | Sound on | 703 | $6.02 | $7.03 |
| 720p | 16s | 21:9 | Sound on | 703 | $6.02 | $7.03 |
| 720p | 17s | 16:9 | Sound on | 747 | $6.40 | $7.47 |
| 720p | 17s | 9:16 | Sound on | 747 | $6.40 | $7.47 |
| 720p | 17s | 1:1 | Sound on | 747 | $6.40 | $7.47 |
| 720p | 17s | 21:9 | Sound on | 747 | $6.40 | $7.47 |
| 720p | 18s | 16:9 | Sound on | 791 | $6.78 | $7.91 |
| 720p | 18s | 9:16 | Sound on | 791 | $6.78 | $7.91 |
| 720p | 18s | 1:1 | Sound on | 791 | $6.78 | $7.91 |
| 720p | 18s | 21:9 | Sound on | 791 | $6.78 | $7.91 |
| 720p | 19s | 16:9 | Sound on | 835 | $7.16 | $8.35 |
| 720p | 19s | 9:16 | Sound on | 835 | $7.16 | $8.35 |
| 720p | 19s | 1:1 | Sound on | 835 | $7.16 | $8.35 |
| 720p | 19s | 21:9 | Sound on | 835 | $7.16 | $8.35 |
| 720p | 20s | 16:9 | Sound on | 878 | $7.52 | $8.78 |
| 720p | 20s | 9:16 | Sound on | 878 | $7.52 | $8.78 |
| 720p | 20s | 1:1 | Sound on | 878 | $7.52 | $8.78 |
| 720p | 20s | 21:9 | Sound on | 878 | $7.52 | $8.78 |
Frequently asked questions
Without a reference video: 3 seconds costs 132 credits, 5 seconds 220, 10 seconds 439 and 20 seconds 878. With a reference video, output plus video seconds are billed: 5 seconds with a 5-second video costs 589 credits.
Flash is cheaper and faster but stops at 720p, 20 seconds and one start photo. Kling 4.0 adds 1080p, start and end photos and clips up to 30 seconds.
Yes. Both names mean the Flash tier of Kling 4.0 from Kuaishou.
Not on LeafReel. Every clip uses credits and there is no free video allowance. You can try LeafReel with one free 1K image (watermarked).
Yes. Every clip has stereo sound, including dialogue you write in the prompt. It cannot be turned off.
Yes. Upload one photo as the start frame and describe what happens next. The clip keeps the photo’s shape instead of the ratio you selected.
Yes. Add one video of up to 10 seconds. The price then counts the output and the video’s seconds, at a higher rate per second.
