AI model guide · Kuaishou Kling
Kling 4.0: What It Is, What It Costs, How to Use It
Kling 4.0 is Kuaishou’s next-generation Kling AI video model, introduced in . It covers text-to-video (T2V), image-to-video (I2V), Omni Reference (up to about 15 refs across images, videos, subjects, and voice), up to ~10 keyframes, native clips roughly 3–30 seconds, 720p/1080p, 21:9, and long prompts. This page summarizes capabilities and API pricing—always verify on kling.ai.
Note: API unit prices below come from public Kling docs around launch. Duration formulas (especially when an input video is present) can change the effective cost. Reviewed on (Asia/Shanghai). Verify on the official pricing page.
What Kling 4.0 is
- Vendor: Kuaishou; product brand Kling AI (kling.ai).
- Modes: Text-to-video (T2V), image-to-video (I2V), Omni Reference conditioning.
- Omni Reference: Up to ~15 references — images, videos, subjects, and voice.
- Timeline control: Up to ~10 keyframes; long prompts supported.
- Output: Native ~3–30s clips; 720p / 1080p; 21:9 aspect among supported framings.
- Surfaces: Kling product on kling.ai plus developer/API access (confirm current regions).
Pricing
Figures below are public USD per-second API rates as listed on Kling resources around mid/late October 2026. When an input video is present, unit rates look lower but duration formulas may multiply—read the pricing page carefully before production spend.
| Scenario | 720p | 1080p | Notes |
|---|---|---|---|
| No input video | $0.157 / s | $0.235 / s | Output duration determines the charge; consult the linked pricing documentation for the full formula. |
| With input video (unit rate) | $0.094 / s | $0.141 / s | Input video can affect billable duration and the total charge. |
| Web app credits | Plan- or credit-based (varies) | Web app credit packages are separate from API billing. | |
How to get started
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Open Kling AI
Go to kling.ai, create an account, and try a short T2V or I2V clip in the product UI.
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Read the Kling 4.0 launch notes
Skim the Kling 4.0 storytelling / creative-control blog for Omni Reference and keyframe behavior.
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Wire the API carefully
If you need automation, create API credentials from Kling’s developer docs. Start with 720p and short durations; log billed seconds before scaling 1080p or multi-ref jobs.
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Compare against your baseline
Render the same prompt on Kling 4.0 and your current Seedance / Runway (or other) baseline. Judge motion, identity hold, and cost yourself—do not rely on marketing scoreboards.
How Kling 4.0 compares
Compare Kling with Seedance or Runway using the same creative brief and reference material. Focus on the clips you can use, rather than a single promotional example.
| Area | Question | Suggested test |
|---|---|---|
| Reference consistency | Does the subject remain recognizable? | Use the same subject reference across several shots. |
| Motion and control | Does the clip follow the intended movement and timing? | Repeat a camera move or keyframe sequence. |
| Delivery cost | How much does an acceptable clip cost? | Include failed attempts, duration, resolution, and credit usage. |
Official sources
- Kling AI (kling.ai)
- Kling blog — Kling 4.0 storytelling / creative control
- Kuaishou IR — Kling 4.0 launch release
FAQ
What is Kling 4.0?
Kling 4.0 is Kuaishou’s next-generation Kling AI video model, introduced in 2026. It supports text-to-video, image-to-video, Omni Reference (up to 15 references across images, videos, subjects, and voice), up to 10 keyframes, and native clips roughly 3–30 seconds at 720p or 1080p, including 21:9.
Who makes Kling 4.0?
Kuaishou builds Kling AI. Product surfaces and developer docs are published on kling.ai; corporate launch notes also appear via Kuaishou investor relations. Regional availability and account requirements can differ, so use the live product for your market.
How much does Kling 4.0 API cost?
Public kling.ai docs around launch listed roughly $0.157/s (720p) and $0.235/s (1080p) with no input video, and lower unit rates with input video ($0.094/$0.141)—but duration formulas may multiply cost. Always re-check the official pricing page before budgeting.
What resolutions and lengths does Kling 4.0 support?
Vendor materials describe native durations of about 3–30 seconds, 720p and 1080p output, and 21:9 aspect support, plus long prompts and multi-keyframe control. Confirm current caps in the product UI and API docs.
What is Omni Reference in Kling 4.0?
Omni Reference lets you condition generation on multiple references—vendor framing allows up to about 15 refs spanning images, videos, subjects, and voice—aimed at stronger visual realism and storytelling control.
Does Kling 4.0 support keyframes?
Yes. Launch materials describe up to about 10 keyframes for timeline / storytelling control, alongside T2V and I2V modes. Exact UI limits can change—check Kling’s creative-control docs.
How do I get started with Kling 4.0?
Open kling.ai, create an account, try T2V or I2V in the product, then review API docs if you need automation. Run a short 720p test before scaling 1080p or long clips so you understand billing.
How does Kling 4.0 compare to Seedance or Runway?
All three sit in generative video. Kling 4.0 emphasizes Omni Reference, keyframes, and published per-second API rates. Seedance and Runway have their own motion and editing strengths. Compare the same prompt and reference images across tools, and judge consistency, motion, and total cost.
Is there a consumer app as well as an API?
Yes. Kling AI ships product surfaces on kling.ai for creators in addition to developer/API access. Credit packs, feature gates, and regional packaging can differ from raw API meters—check the live product UI alongside the pricing docs.
Is this page affiliated with Kuaishou or Kling?
No. This is an independent FAQ-style explainer. Confirm pricing, terms, model availability, and duration billing formulas on official Kling / Kuaishou sites before purchasing credits or integrating the API.
Updated (Asia/Shanghai). Not affiliated with Kuaishou, Kling AI, Seedance, or Runway.