Kling 4.0 officially launched on October 15, 2026. Kuaishou's Kling AI first announced it on September 28, 2026, when a lighter variant, Kling 4.0 Flash, opened to Kling Ultra Yearly subscribers. The full model generates up to 30 seconds in a single pass, takes up to 10 keyframes and up to 15 references, and Kling says it supports 10-bit HDR, with 4K and 21:9 also announced. Since October 26, 2026 it is also live on ImagineToVideo: see our Kling 4.0 AI Video Generator page, or open Kling 4.0 text to video directly.
This guide walks through what Kling AI 4.0 brings, feature by feature: what Kling says each one does, what it could change for the way you make video, and what still has to be checked. The specs below come from Kling's announcement and launch release; they have not been independently benchmarked yet.
Kling 4.0 Release Date and Availability
| Kling 4.0 | Kling 4.0 Flash | |
|---|---|---|
| Status | Officially launched October 15, 2026 | Early access from September 28, 2026 |
| Who can use it | Users of Kling's own platform | Kling Ultra Yearly subscribers |
| Max length per generation | 30 seconds | 20 seconds |
| API | Public on fal since October 23, 2026 ($0.157/s at 720p, $0.235/s at 1080p); Kling's own API announced | — |
| On ImagineToVideo | Live since October 26, 2026 | — |
Launched ≠ benchmarked. Kling 4.0 is out, but most of the specs below are still the company's own claims. We note what has and has not been checked.
What's New in Kling 4.0: Feature by Feature
1. Up to 4K in 10-bit HDR
What Kling says: Kling 4.0 outputs video at up to 4K resolution in 10-bit HDR.
Why it matters: Resolution is only half of this. Most AI video today is delivered as 8-bit SDR, which has 256 brightness levels per color channel; 10-bit has 1,024. In practice that is the difference between a sunset sky that bands into visible stripes and one that grades smoothly — and it gives you real headroom to color-correct afterwards without the image falling apart. If you finish work in DaVinci Resolve or Premiere, or deliver to HDR displays, this is the feature to watch.
⚠️ To verify: frame rate (not disclosed), which HDR standard and color space the files use, and whether 4K is available at every duration. fal's public Kling 4.0 API offers 720p and 1080p only, so those are the options on ImagineToVideo today.
2. Up to 30 seconds in a single generation
What Kling says: A single Kling 4.0 generation can run up to 30 seconds. Kling 4.0 Flash is capped at 20 seconds.
Why it matters: Kling 3.0 tops out at 15 seconds per clip. Doubling that means one generation can hold a complete beat — a character walks in, reacts and delivers a line — without stitching clips together and hoping the lighting and faces still match. Fewer cuts means fewer places for consistency to break.
Checked on ImagineToVideo: a 30-second 1080p clip rendered in about eight minutes in our integration tests. Whether character identity holds across the full 30 seconds still depends on the prompt; try it with your own material.
3. Up to 15 multimodal references
What Kling says: One generation task can take up to 15 references in total, including up to 10 images, 5 videos and 7 subjects.
Why it matters: This is the feature most likely to change day-to-day work. Instead of describing a character, a product and a location in words and hoping the model agrees, you hand it the character sheet, the product shots, a motion reference and a voice sample, all in one task. For brand work, series content and anything with recurring characters, reference control matters more than raw resolution.
⚠️ To verify: how faithfully the output sticks to each reference when many are combined.
4. Up to 10 keyframes
What Kling says: Kling 4.0 accepts up to 10 keyframe inputs.
Why it matters: Start and end frames tell a model where a shot begins and lands. Ten keyframes let you pin down the path in between — useful for product reveals, choreography and any shot where the middle matters as much as the ends.
⚠️ To verify: how keyframes combine with the 30-second limit and with multimodal references in the same task.
5. Stereo audio and more accurate lip sync
What Kling says: Stereo audio, more accurate lip sync, and support for multiple languages and accents.
Why it matters: Stereo sound and better lip sync push generated clips closer to something you can publish without a separate audio pass, and multi-language support matters if you localize the same spot for several markets.
⚠️ To verify: which languages and accents are covered, and how lip sync holds up on long dialogue.
6. Video extension
What Kling says: You can continue an existing clip instead of starting over.
Why it matters: Regenerating an entire clip because it ends too early is where a lot of credits get burned. Extending a take you already like keeps what works and adds only what is missing.
⚠️ To verify: how clean the join looks. Kling says multiple extensions of up to two minutes are coming soon.
Kling 4.0 vs Kling 3.0 (and the "Kling 4K Mode")
One naming trap first: Kling 4.0 is not the same thing as Kling's "4K mode." The 4K mode is a resolution option Kling added to the existing Video 3.0 series in April 2026 — we covered it in our Kling 4K mode guide. Kling 4.0 is a new model generation.
| Kling 3.0 | Kling 4.0 | |
|---|---|---|
| Max length per generation | 15 seconds | Up to 30 seconds |
| Resolution | Up to 1080p; 4K via the separate 4K mode | 1080p; 4K and 21:9 announced |
| HDR | Not advertised | 10-bit HDR |
| References | Reference-to-video on the Omni variant | Up to 15 references: 10 images, 5 videos, 7 subjects |
| Keyframes | Start and end frames | Up to 10 keyframes |
| Audio | Native audio; lip sync on the Omni variant | Stereo audio, more accurate lip sync, multiple languages and accents |
| Video extension | — | Supported |
| Status | Available now | Live on ImagineToVideo since October 26, 2026 |
The Kling 4.0 column is Kling's own description; the Kling 3.0 column is what is shipping today.
How to Get the Most out of Kling 4.0
Whether you use Kling's own platform or ImagineToVideo, a little preparation pays off.
- Build your reference library. Collect clean character images from several angles, product shots on neutral backgrounds, short motion references and any voice samples. Multimodal references only help if the references are good.
- Write prompts as scenes, not keywords. Put the shot description, any spoken lines in quotes and the ambient sound in one block. Audio-native models read prompts that way, and prompts written like this carry straight over.
- Plan in 30-second beats. If a story needs three 10-second clips today, sketch where it could become one continuous take; Kling 4.0 on ImagineToVideo renders 3 to 30 seconds in one pass.
- Decide whether you need HDR. If your delivery is social feeds viewed on phones, 1080p SDR may be all you need — and likely cheaper. Save 4K HDR for work that will be graded or shown on large screens.
Kling 4.0 on ImagineToVideo
Kling 4.0 has been live on ImagineToVideo since October 26, 2026, through fal's public API, which fal opened to all customers on October 23. You get text to video and image to video with an optional end frame, 720p or 1080p, 3 to 15, 20 or 30 seconds, 16:9, 9:16, 1:1 or 21:9, and stereo audio generated with every clip. No separate Kling account or API key is needed; the same credits work across every model on the site.
| Length | 720p | 1080p |
|---|---|---|
| 3 seconds | 20 credits | 30 credits |
| 5 seconds | 35 credits | 50 credits |
| 10 seconds | 70 credits | 100 credits |
| 30 seconds | 215 credits | 320 credits |
fal's underlying rate is $0.157 per second at 720p and $0.235 at 1080p, audio included. The $0.99 Starter Pack (30 credits, one-time) covers a 3-second Kling 4.0 clip. Start from Kling 4.0 text to video or Kling 4.0 image to video; the full how-to and pricing table is in our launch post.
These models run alongside it, all with native audio:
| Model | Length | Resolution | Best for |
|---|---|---|---|
| Kling 4.0 | 3–15, 20 or 30s | 720p / 1080p | 30-second single takes with stereo audio |
| Kling V3 | 3–15s | 720p / 1080p | Strong camera motion, single takes |
| Kling V3 Omni | 3–15s | 720p / 1080p | Reference-driven, multi-shot consistency |
| Seedance 2.5 | 4–15, 20 or 30s | 480p / 720p | Long single-pass stories with lip-synced dialogue |
| VEO 3.1 | 4 / 6 / 8s | 720p / 1080p / 4K | Spoken dialogue in a single prompt, 4K |
What Is Still Unknown or Not Exposed Yet
- Reference-to-video on ImagineToVideo. fal's API takes up to 15 references per task; we have not exposed that mode yet. Kling V3 Omni and Seedance 2.5 take reference images today.
- Kling's own API pricing. Kling has announced developer access to Kling 4.0, but we have not found a published official rate card; fal's rate is the one we pay.
- 4K in practice. Kling announces 4K and 21:9; fal's API offers 720p and 1080p, with 21:9 available.
- Motion Control 4.0. Kling's September 28 announcement does not mention a new Motion Control version; Kling 3.0 Motion Control remains the current release.
FAQ
When was Kling 4.0 released? Kling 4.0 officially launched on October 15, 2026. Kling announced it on September 28, 2026, when Kling 4.0 Flash opened to Kling Ultra Yearly subscribers.
What is Kling 4.0 Flash? Kling 4.0 Flash is the early variant of Kling 4.0 that Kling opened on September 28, 2026 to Kling Ultra Yearly subscribers only. It generates up to 20 seconds per clip, compared with up to 30 seconds for the full model launched on October 15.
What resolution and length does Kling 4.0 support? Kling 4.0 generates up to 30 seconds in a single pass. Kling says it supports 10-bit HDR and announces 4K and 21:9; the API endpoints listed so far offer 720p and 1080p. Frame rate has not been disclosed.
Is Kling 4.0 the same as the Kling 4K mode? No. The Kling 4K mode is a resolution option added to the Kling Video 3.0 series in April 2026. Kling 4.0 is a new model generation that adds 10-bit HDR, 30-second generations, up to 10 keyframes and up to 15 multimodal references.
Can I use Kling 4.0 on ImagineToVideo? Yes. Kling 4.0 has been live on ImagineToVideo since October 26, 2026 through fal's public API: text to video and image to video with an optional end frame, 720p or 1080p, 3 to 30 seconds, with stereo audio. A 5-second 720p clip costs 35 credits; 30 seconds at 1080p costs 320 credits.
Try it from our Kling 4.0 AI Video Generator page, or read the launch post for the full pricing table and how-to.
Changelog
- 2026-09-29: aligned with official Kling 4.0 announcement
- 2026-10-21: updated for the official October 15 launch; API and ImagineToVideo status re-checked
- 2026-10-23: fal opens its Kling 4.0 API to all customers with published pricing
- 2026-10-26: Kling 4.0 live on ImagineToVideo; credit prices and on-site specs added
