Kling 4.0 Release Date: Out for Everyone Since October 15
The Kling 4.0 release date was October 15, 2026, after a September 28 announcement and Flash early access. Official specs vs the leak, and where the API stands.
Updated October 22, 2026: Kling 4.0 became available to everyone on October 15, Kling's own API offers it only as early access by inquiry, and Kling 4.0 is now callable on reAPI. The September 24 leak stays below for comparison.
The Kling 4.0 release date is October 15, 2026. Kling announced the model on September 28, 2026, posting on X that "Kling 4.0 is coming this October"[2]. Its release note, "Meet All-New Kling 4.0!", now opens with the date: "The all-new Kling 4.0 officially became available to everyone on October 15"[1]. The faster tier, Kling 4.0 Flash, came first: it opened to a limited early-access group on September 28, and Kling's post on X named Ultra Yearly subscribers as the first to get it[2].
Four days before the announcement, leaked screenshots had shown both models inside Kling's creator app. This article lays out the official Kling 4.0 release date and specs, checks the leak against them, and shows where the Kling 4.0 API stands.
TL;DR
- Kling 4.0 release date: October 15, 2026, when Kling made the full model available to everyone[1].
- Kling 4.0 Flash: in early access since September 28, 2026, for a limited group; Kling names Ultra Yearly subscribers[1][2].
- Official specs: 3–30 second clips, 720p to 4K, up to 10 keyframes, up to 15 references, stereo audio, 10-bit HDR at 1080p and 4K listed as coming soon[1].
- The leak was mostly right. Clip length, keyframes, and reference limits match. It missed 4K, and its 120-second Long Video mode is not in the announcement[1][3].
- API: Kling's developer site announces early access, but its pricing page says "Kling 4.0 API access is not yet available" and shows preview prices only[4][5]. On reAPI, Kling 4.0 has been callable since October 22, 2026[10].
The Kling 4.0 release date, as Kling announced it
Kling published the announcement on September 28, 2026, on both its release-notes page and its X account[1][2]. Here is where each official channel stands on the Kling 4.0 release date as of October 22:
| Official source | What it says | Kling 4.0 date |
|---|---|---|
| Release note | "The all-new Kling 4.0 officially became available to everyone on October 15"[1] | October 15, 2026 |
| @Kling_ai on X, September 28 | "Kling 4.0 is coming this October. Kling 4.0 Flash is live now for Ultra Yearly subscribers."[2] | Flash: September 28, 2026 |
| API developer site | Banner: "Kling 4.0 API Is Now Available for Early Access"; the changelog's newest entry is still September 15[4] | Early access |
| API capability map | Lists a Kling 4.0 column[6] | Listed |
| Developer pricing | "Kling 4.0 API access is not yet available. The prices below are for preview purposes only"; early access goes through Business Inquiries[5] | Not announced |
So Kling 4.0 has two release dates. For creators in Kling's app it was October 15, with Flash out since September 28. For developers, Kling's own API offers early access by business inquiry, and its pricing page says "the official launch date and pricing will be announced separately"[5]. You can also call Kling 4.0 through reAPI, where it went live on October 22, 2026[10].
What Kling 4.0 actually is
The release note that set the Kling 4.0 release date also includes full spec tables for both models[1].
| Capability | Kling 4.0 | Kling 4.0 Flash |
|---|---|---|
| Text-to-video | Yes | Yes |
| Image-to-video | First and last frames, up to 10 keyframes | First frame |
| Omni Reference | Up to 15 references | Yes |
| Duration | 3–30 seconds | 3–20 seconds |
| Resolution | 720p, 1080p, 4K | 720p |
| Dynamic range | 10-bit HDR at 1080p and 4K | 8-bit SDR |
| Aspect ratios | 21:9, 16:9, 1:1, 9:16, Auto | Not listed |
| Audio | Two-channel stereo | Not listed |
The reference limits are specific. Kling 4.0 takes up to 10 reference images, up to 5 reference videos with a combined length of 30 seconds, up to 7 elements (up to 3 of them video-based), and voice references, with no more than 15 items in total[1]. Prompts can run to 8,000 tokens. Video editing accepts up to 5 clips, one of them primary, with a 30-second total[1].
Two features are marked as not quite ready. Kling says 10-bit HDR at 4K and 1080p is "coming soon," and so is extending a video several times up to 2 minutes[1]. Kling also redesigned the creation page for the launch, moving every input into one box[1].
How the leak compares with the official Kling 4.0
On September 24, 2026, screenshots and a written summary from the Dev Mode Discord showed "VIDEO 4.0 Preview" and "VIDEO 4.0 Flash Preview" in Kling's creator app[3][7]. The earlier version of this article, written before any official Kling 4.0 release date existed, treated those numbers as provisional. Here is how they held up:
| Item | Leak (September 24) | Official (September 28) |
|---|---|---|
| Clip length | 3–30 s[3] | 3–30 s[1] |
| Resolution | 720p and 1080p[3] | 720p, 1080p, and 4K[1] |
| Keyframes | Up to 10[3] | Up to 10, plus first and last frames[1] |
| References | 10 images, 5 videos, 7 Elements, 15 total[3] | Same limits[1] |
| Voice references | Up to 3[3] | Supported, no count given[1] |
| Long video | Experimental mode, up to 120 s[3] | Not announced; extension up to 2 minutes "coming soon"[1] |
| Kling 4.0 Flash | 3–20 s, 720p[3] | 3–20 s, 720p, 8-bit SDR[1] |
| Image 4.0 | 1–9 images, up to 8K[3] | Not part of the announcement[1] |
| Pricing | "No prices are confirmed"[3] | API preview prices only; official pricing to be announced[5] |
The leaker described the numbers as "preliminary settings," and most of them landed exactly[3]. The biggest miss was 4K. The leaked settings listed 720p and 1080p only, and the official Kling 4.0 adds 4K. The second miss was the 120-second Long Video mode, which does not appear in the release note at all.
Kling 4.0 vs Kling 3.0
Both models can now be called through an API, so this is the comparison that matters for anyone planning a migration.
| Kling 3.0 | Kling 4.0 | |
|---|---|---|
| Clip length | 3–15 s[6] | 3–30 s[1] |
| Resolution | 720p, 1080p, 4K[6] | 720p, 1080p, 4K, 10-bit HDR[1] |
| Frame control | First and last frame[6] | First and last frames, up to 10 keyframes[1] |
| Audio | Native audio, multiple languages[8] | Two-channel stereo, more accurate lip sync[1] |
| Faster tier | Kling 3.0 Turbo, 720p and 1080p[6] | Kling 4.0 Flash, 720p[1] |
| API | Available[6] | Early access by inquiry on Kling's API; live on reAPI[5][10] |
Length is the headline change of this Kling 4.0 release. Every 3.0 model on Kling's API capability map stops at 15 seconds per request[6], and Kling 4.0 doubles that. Keyframes are the second change: ten frames instead of two give you real control over the middle of a shot.
Kling's release rhythm in 2026
| Date | Official release |
|---|---|
| January 31, 2026 | Kling 3.0 rollout[9] |
| February 5, 2026 | Kuaishou announces Video 3.0, Video 3.0 Omni, Image 3.0, and Image 3.0 Omni[8] |
| March 4, 2026 | Kling VIDEO 3.0 Motion Control[9] |
| April 23, 2026 | Native 4K output[9] |
| June 17, 2026 | Kling 3.0 Turbo and the Kling 3.0 Omni upgrade[9] |
| September 28, 2026 | Kling 4.0 announced; Kling 4.0 Flash early access[1] |
| October 15, 2026 | Kling 4.0 available to everyone[1] |
The three-month gap after June 17 was the longest of the year, and it ended with the biggest release. The Kling 4.0 release date then came 17 days after the announcement.
How to use Kling 4.0 through an API now
Kling 4.0 on reAPI runs on the same /api/v1/videos/generations endpoint as Kling 3.0, under the model id kling-4-0[10]. It takes text, first, last, and key frames, image, video, and audio references, and it can edit or extend a video, in 3–30 second clips at 720p or 1080p. Kling 4.0 Flash is not on reAPI yet; the Kling 4.0 Flash page tracks it.
Stay on Kling 3.0 when you need multi-shot prompts or 4K output, which it already offers[6]. Move to Kling 4.0 for longer takes, keyframes, and reference-driven shots.
FAQ
When is the Kling 4.0 release date?
October 15, 2026. Kling's release note says "The all-new Kling 4.0 officially became available to everyone on October 15"[1]. Kling had announced the model on September 28.
Is Kling 4.0 out?
Yes. Kling 4.0 has been available to everyone since October 15, 2026, and Kling 4.0 Flash has been out since its September 28 early access[1][2].
Is Kling 4.0 out on iOS?
There is no separate iOS Kling 4.0 release date. Kling 4.0 runs inside Kling's own app and website, and Kling has not announced separate platform dates[1].
Were the Kling 4.0 leaks accurate?
Mostly. The leaked clip length, keyframe count, reference limits, and Flash specs all match the official release note. The leak missed 4K, and its 120-second Long Video mode and Image 4.0 were not part of the announcement[1][3].
What is Kling 4.0 Flash?
The faster tier of Kling 4.0, built for frequent creation. It makes 3–20 second clips at 720p in 8-bit SDR, from text, a first frame, or Omni Reference inputs[1].
Does Kling 4.0 support 4K?
Yes. The official spec lists 720p, 1080p, and 4K, with 10-bit HDR at 1080p and 4K marked as coming soon[1]. Kling 4.0 Flash is 720p only.
When will the Kling 4.0 API be released?
Kling has not set a public date. Its developer site offers Kling 4.0 API early access through business inquiries, and its pricing page says "Kling 4.0 API access is not yet available" and that the official launch date will be announced separately[4][5]. On reAPI, Kling 4.0 has been callable since October 22, 2026, with pay-as-you-go credits[10].
How much does Kling 4.0 cost?
Kling shows preview API prices for Kling 4.0 and says official pricing will be announced separately[5]. On reAPI, Kling 4.0 bills per second by resolution, with no subscription; the current rates are on the Kling 4.0 page[10].
After the Kling 4.0 release date
The Kling 4.0 release date has come and gone. Kling 4.0 has been available to everyone since October 15, its specs match the September 28 release note, and Flash has been out since September 28. For developers, Kling's own API is still in early access by inquiry, and reAPI serves it on the same endpoint as Kling 3.0. The open questions now are practical ones, like how the 30-second takes and keyframes hold up in your own shots.
References
- Kling AI. Meet All-New Kling 4.0! (release note). Updated October 15, 2026. Retrieved October 22, 2026 from kling.ai/release-note/release-notes/Kling_4
- Kling AI on X. Kling 4.0 is coming this October. Kling 4.0 Flash is live now for Ultra Yearly subscribers. September 28, 2026. Retrieved October 2026 from x.com/Kling_ai
- Kol Tregaskes on X. Kling 4.0 Preview and Kling 4.0 Flash + Kling Image 4.0 are on the way (Dev Mode Discord summary by Mars). September 24, 2026. Retrieved September 2026 from x.com/koltregaskes
- Kling AI. API Updates. Retrieved October 22, 2026 from kling.ai/document-api/updates/api
- Kling AI. API pricing and purchase. Retrieved October 22, 2026 from kling.ai/dev/pricing
- Kling AI. API capability map: video. Retrieved October 22, 2026 from kling.ai/document-api/guides/capability-map/video
- Esteban Diba on X. Kling 4.0 looks very close (creator-app screenshots). September 24, 2026. Retrieved September 2026 from x.com/estebandiba
- Kuaishou Technology. Kling AI Launches 3.0 Model, Ushering in an Era Where Everyone Can Be a Director. February 5, 2026. Retrieved September 2026 from ir.kuaishou.com
- Kling AI. Release Notes. Retrieved October 2026 from kling.ai/release-note
- reAPI. Kling 4.0. reapi.ai/models/kling-4-0
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