Kling 4 (kling4.io) is an independent, third-party site tracking Kuaishou's Kling 4.0 AI video model, announced September 28, 2026 with a full launch planned for October. It is not affiliated with, endorsed by, or operated by Kuaishou or Kling AI; for official news and the official app, visit Kuaishou's own channels.
Officially, Kling 4.0 brings several upgrades over Kling 3.0: clip length grows from 15 to 30 seconds, keyframe control expands from first-and-last-frame to up to 10 keyframe images so a shot can hit exact beats instead of relying on rerolls, and an omni-reference mode accepts up to 15 items in one prompt (up to 10 images, up to 5 reference videos totalling 30 seconds, voice references and up to 7 subjects) to lock a face, a product or a style across a whole clip. Two-channel stereo audio generates with the picture, including lip sync across nine languages: Chinese, English, Japanese, Korean, Spanish, Portuguese, German, French and Indonesian, plus regional accents.
Kling 4.0's API is not yet open to third-party platforms, so today kling4.io runs the newest Kling engine that is publicly available for free text-to-video and image-to-video generation, and clearly labels every clip with the model actually used. The site tracks and republishes verified specs, release-date updates and Kling 4 vs Kling 3 comparisons as Kuaishou's rollout continues, alongside coverage of Kling 4.0 Flash, the separate lighter version in the same lineup (720p, 3 to 20 seconds, 8-bit SDR) that trades resolution and length for speed and lower cost.
There is no app to install and no waitlist for the current engine: open kling4.io in any desktop or mobile browser, sign in with Google for free starter credits plus daily check-in bonuses, then generate from a plain-English prompt or an uploaded reference image. Paid plans start at $15 per month for higher-resolution, longer clips, and one-time credit packs are also available. Under the site's Terms of Service, generated videos can be used for personal and commercial work, subject to the underlying model provider's usage policies.
