Kling 4.0: what ships today and what is still a promise

Kling 4.0 has a name, a spec sheet and a month, but not a date. Twelve days after Kuaishou announced it, the only part a creator can actually run is the lighter Flash tier, and the full model is still waiting on an October launch the company has not pinned down.

The release note on Kling's own site says the all-new Kling 4.0 "will officially launch in October" and that "Kling 4.0 Flash became available to a limited group of users for early access on September 28." That is the whole availability picture: one tier, in closed early access, and one month for the rest.

What is Kling 4.0?

It is the next generation of Kuaishou's Kling video model, the one that has been the value pick for short social clips since Kling 3.0 launched in February. Kling files 4.0 and 4.0 Flash as one family with two tiers, and the split is clean on the vendor's own page.

What can you use today?

Only Kling 4.0 Flash, and only if you are in the early-access group. Kuaishou opened Flash to Ultra Yearly subscribers on September 28, and it is capped at 720p with clips of 3 to 20 seconds. Third-party write-ups put the same limits on it, and no public free tier for the 4.0 family has been published.

What does the full model promise?

Kling's own spec table lists the full model at 3 to 30 seconds per generation, at 720p, 1080p or 4K, with 10-bit HDR at 1080p and 4K marked "coming soon." It takes up to 10 keyframe images, up to five reference videos with a combined length of 30 seconds, and up to 15 reference items across images, video, voice and elements. Prompts run to 8,000 tokens, audio is two-channel stereo, and the model generates on-screen text in Chinese, English, Japanese, Korean, Spanish, Portuguese, German, French and Hindi, with accents including American, British and Indian English.

The headline change for anyone who stitches short clips together is length: 30 seconds in a single pass doubles Kling 3.0's 15-second ceiling, and it matches what Alibaba's Wan 3.0 and ByteDance's Seedance 2.5 already generate in one pass.

What is still missing?

Three things a creator needs before planning work around it. There is no launch day, only "October." There is no price, and no rate card for either tier has been published. And there is no API: Kling's API pricing page still lists Kling 3.0, 3.0 Turbo, 3.0 Omni, O1, 2.6 and 2.5 Turbo, with no Kling 4.0 entry and no model identifier, so the only way anyone is calling 4.0 today is inside Kling's own creation page.

What it means for creators

If your account shows the 4.0 family or Flash, run one short test clip and confirm the model name on the output card before spending a longer generation. If it does not, the practical answer is unchanged: Kling 3.0 is the live model with a published price, and the full 4.0 is a release to watch rather than one to build on. The accurate summary is that Kling 4.0 is specified and not shipped, and the figures that sound best in the announcement, the 4K and the HDR, are the ones Kuaishou has hedged hardest.

Kling 4.0 Flash is in limited early access on Kling's own platform; the full model is due in October 2026, with no date, price or API published.