Kling 4.0 is now fully available on the Kling AI website, the company announced on October 16. We first covered it on October 1, when Kling previewed the model and opened a lighter version, Kling 4.0 Flash, to Ultra Yearly subscribers only. This brief has been updated for the launch.
What changed
The biggest headline is length. Kling 4.0 generates native clips of up to 30 seconds in a single pass, double the previous 15-second limit, so a full social spot or a longer shot no longer has to be stitched together from separate generations. Kling’s launch announcement adds that you can upload an existing video and extend it up to two minutes.
The other changes are about control. Kling says the model accepts up to 15 multimodal references, which the launch announcement describes as images, video, and audio, plus up to 10 keyframes. It also accepts guide videos such as white-model (untextured) and depth-map clips to steer a character’s performance, action, and camera movement. Prompts can now run up to 8,000 tokens, which leaves room for a detailed shot brief.
Kling highlights more stable motion and complex camera moves like push-ins, pans, tracking shots, and orbits. Its preview post also mentioned high-quality stereo audio, and the launch announcement lists expanded support for languages and accents, including English, Japanese, Korean, Spanish, Portuguese, German, French, and Hindi.
Two things are still missing. Kling says 10-bit HDR output at 4K and 1080p and a 21:9 ultra-wide format are coming “soon,” so they aren’t part of the launch. API access for developers and enterprise customers is also listed as coming soon, and Adobe says Kling 4.0 and Kling 4.0 Flash are coming to Firefly.
Why it matters for designers
Clip length and consistency have been the two biggest practical limits on AI video for real production. Thirty seconds in one pass covers a lot of social and ad formats outright, and stitching shorter clips together has always been where characters, lighting, and products drift.
The reference and keyframe controls matter even more for anyone doing brand work. Being able to feed in product shots, a character, and style frames, then pin the action to specific keyframes, moves this closer to directing a shot rather than rolling the dice on a prompt.
What to watch out for
Not every headline spec shipped with the model. HDR and 21:9 were part of the preview pitch and still aren’t available, so don’t plan a delivery around them yet.
Everything here comes from Kling’s own announcements and early coverage. We haven’t tested Kling 4.0 ourselves, and the launch announcement leans on partner showcases rather than independent results, so judge it on a test generation of your own.
Longer clips usually mean more credits per generation, and Kling’s announcement doesn’t say which plans include the model or what it costs. Check the current pricing before you budget a project around it.
