Kling 4.0
Kuaishou's Kling 4.0 generates cinematic 3-30 second videos with native audio at 720p or 1080p, in 16:9, 9:16, 1:1 or 21:9 widescreen. Animate a first frame through up to 8 keyframes into a last frame, or keep characters and objects consistent from reference images and clips.
24% less than the priciest provider (7 compared). Same model, same output.
As of , Kling 4.0 costs from $0.12 per second on Scenetra, billed at provider cost with no markup. Each run is priced across 12 providers and runs on the cheapest one that supports your settings.
Aspect Ratio
16:9, 9:16, 1:1 or 21:9 widescreen.
Resolution
720p or 1080p.
Duration
Length of the video in seconds (3-30). Billed per second.
24% less than the priciest provider (7 compared). Same model, same output.
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Use Kling 4.0 via the API
One REST call per generation, routed to the cheapest provider and billed in credits at provider cost. Endpoints, request fields, code examples and pricing are in the full API reference.
What makes Kling 4.0 different
30-second cinematic takes with sound
Kling 4.0 generates any length from 3 to 30 seconds in one continuous shot, with native audio. A 10-second 720p clip is $1.20, a full 30 seconds $3.60.
Direct the story with keyframes
Image to video takes a first frame, up to 8 keyframes and a last frame, up to 10 pinned moments in total. Cite them in the prompt as @first_frame, @keyframe_1 and @last_frame to tell the model what happens between them.
Consistent characters from references
Reference to video keeps people, products and objects consistent from your images, and can copy motion or camera work from a reference clip. Save a character once in Scenetra and reuse it by name across videos.
Widescreen and vertical in one model
16:9, 9:16, 1:1 and cinematic 21:9 are all supported at 720p and 1080p. Every run goes to the cheapest provider for your settings, billed at cost with 0% markup.
Parameters
| Parameter | Type | Description | Default |
|---|---|---|---|
| Prompt* | text | Describe the scene, action and camera, and any sound. Audio is generated natively. | — |
| Aspect Ratio | select | 16:9, 9:16, 1:1 or 21:9 widescreen.16:9 · 9:16 · 1:1 · 21:9 | 16:9 |
| Resolution | select | 720p or 1080p.720p · 1080p | 720p |
| Duration | select | Length of the video in seconds (3-30). Billed per second.3 · 4 · 5 · 6 · 7 · 8 · 9 · 10 · 11 · 12 · 13 · 14 · 15 · 16 · 17 · 18 · 19 · 20 · 21 · 22 · 23 · 24 · 25 · 26 · 27 · 28 · 29 · 30 | 5 |
Pricing
From $0.12 per second
Pay per generation — only pay for what you use.
720p
$0.12/s
per second
1080p
$0.19/s
per second
What a video costs
| Duration | 720p | 1080p |
|---|---|---|
| 5 seconds | $0.60 | $0.95 |
| 10 seconds | $1.20 | $1.90 |
| 15 seconds | $1.80 | $2.85 |
| 30 seconds | $3.60 | $5.70 |
Use cases
Film & storytelling
- 30-second single-shot scenes
- Keyframed story beats
- 21:9 widescreen trailers
- Previz with sound
Marketing & ads
- Product hero shots from references
- Brand characters across spots
- Vertical 9:16 ads
- Before-and-after transitions
Social content
- Dance and motion copies from a clip
- Recurring characters for series
- Loopable mood shots
- Talking characters with audio
E-commerce
- Product spins from photos
- Model try-on clips
- Lifestyle scenes
- Seasonal campaign variants
Frequently asked questions
What is Kling 4.0?+
Kling 4.0 is Kuaishou's latest video model. It generates cinematic 3-30 second clips with native audio at 720p or 1080p, from text, from keyframe images, or from reference images and clips. On Scenetra it runs on boards, on /create and over the API.
How much does Kling 4.0 cost?+
On Scenetra it starts at $0.12 per second at 720p and $0.19 per second at 1080p, so a 10-second 720p clip is $1.20. Each run goes to the cheapest provider for your settings and is billed at provider cost with 0% markup.
How do keyframes work?+
In image to video you give a first frame, optionally up to 8 keyframes and a last frame (up to 10 frames, and no more than the duration plus one). Mention them in the prompt as @first_frame, @keyframe_1 and @last_frame to describe what happens between them.
Can Kling 4.0 keep a character consistent?+
Yes. Reference to video takes reference images (cited as @image_1, @image_2) and clips (@video_1) to keep people, products and style consistent. On Scenetra you can also save a character once and reuse it by name.
What aspect ratios does Kling 4.0 support?+
16:9 landscape, 9:16 vertical, 1:1 square and 21:9 widescreen. Reference to video also has Auto, which follows your references.
Related models
Kling 3.0 Pro
Kuaishou's flagship video generation model delivering stunning visual fidelity. Kling 3.0 Pro supports text-to-video, image-to-video with start/end frames, element references for character consistency, and native audio generation.
View model →Kling 3.0 Standard
Kuaishou's standard-tier video generation model offering text-to-video and image-to-video with support for start/end frames, element references for character consistency, and native audio generation. A cost-effective alternative to Kling 3.0 Pro.
View model →Seedance 2
ByteDance's Seedance 2.0 generates cinematic videos from text prompts with synchronized audio — voice, sound effects, and background music. Pick any duration from 4 to 15 seconds and resolutions up to 1080p, with per-second pricing that keeps 480p drafting cheap.
View model →Gemini Omni 1.2 Flash
Google's Gemini Omni 1.2 Flash generates 3-15 second videos with native audio. Dialogue, music and sound effects are rendered in the same pass as the picture and directed through your prompt. Draft at 360p, render at 720p, or upscale to 1080p and 4K, in 16:9 or 9:16. Five modes: text, image (first and last frame), references, edit and extend.
View model →Start creating with Kling 4.0
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