Kling 4.0 opens to everyone with 30-second 4K video

Kuaishou's Kling AI opened Kling 4.0 to all users on October 15, ending two weeks of limited early access to its lighter Flash tier.

The maker's release note for Kling 4.0 states plainly that "The all-new Kling 4.0 officially became available to everyone on October 15." The full model now carries the specs Kling published when it announced 4.0 in late September.

Kling 4.0 generates 3 to 30 second clips in a single pass at 720p, 1080p or 4K, with 21:9 among its aspect ratios. It takes up to 10 keyframe images to steer a sequence, and up to 15 reference items in one job: 10 images, 5 videos and 7 elements, plus a voice reference. 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 Beijing, Taiwanese, Northeastern Chinese, Sichuanese and Cantonese, plus American, British and Indian English. Its editing tools accept up to 5 input clips.

That is a step past the tier that shipped on September 28. Kling 4.0 Flash, the fast tier, is capped at 3 to 20 seconds in 720p and 8-bit SDR, with image-to-video limited to the first frame. Flash carries Omni Reference, the feature that reads the narrative pacing, shot composition and visual expression of an existing video and swaps in new products and characters, but not the rest of the list.

The timing matters because Kling 4.0 is landing just as filmmakers put it on real footage. Deadline reported from the Busan International Film Festival's Asian Contents & Film Market that South Korean director Sung-Soo Kim paused his AI short "Worm Train" in March, then resumed in late September once Kling 4.0 let him generate continuous motion between frames. Chosun Biz, covering the same rollout, reports Kling is courting Korea's professional market through partnerships with two domestic AI associations.

Two things are still promises. Kling's own page marks 10-bit HDR output at 1080p and 4K as "coming soon," and a feature extending videos up to 2 minutes as "coming soon" too. The release note publishes no price for either tier, so per-credit costs remain unknown. The "available to everyone" line is Kling's own, and it covers the standard creation page.

Kling 4.0 now works through MCP and CLI, including Omni Reference and keyframe generation, so agents can drive it. For a creator with a login, the change is that the model worth testing is finally the full one.

Sign in at kling.ai, pick Kling 4.0 on the creation page, and test a full 30-second generation before planning a project around it; Flash stays the faster tier but stops at 720p.