What Kling 4.0 is good at
Scenes that run 30 seconds
One generation now runs up to 30 seconds, twice Kling 3.0, so a long take or a full scene plays out without a stitch.
Story beats you place
Write beats as time ranges, or pin up to 10 keyframes, and each moment lands where you put it rather than where the model guesses.
Characters that stay themselves
Up to 15 references hold a face, a costume, and a voice from shot to shot, so a recurring cast reads as the same people.
Dialogue in the language you write
Quote the line and name the language and accent. The delivery comes back lip-synced, with the room around it in stereo.
Words that stay legible
Spell out what a sign, label, or title says and it renders readably in nine-plus languages, holding as the camera moves.
Edits that leave the rest alone
Change one thing in a clip, the time of day, a background, a camera move, and everything you did not mention holds still.
Kling 4.0 or Kling 4.0 Flash: which to use
Kuaishou announced Kling 4.0 in its official release note with two tiers. Draft on Flash, finish on Kling 4.0.
| Kling 4.0 | Kling 4.0 Flash | |
|---|---|---|
| Clip length | 3 to 30 seconds | 3 to 20 seconds |
| Resolution | 720p, 1080p, 4K | 720p |
| HDR | 10-bit at 1080p and 4K, coming soon | 8-bit SDR |
| Keyframes | Up to 10, plus first and last frames | Not listed |
| References | Up to 15 | Omni Reference |
| Best for | Final renders, long takes, grading | Drafts, hook tests, social batches |
How to write a Kling 4.0 prompt
Write a shot brief, not a caption. Kling 4.0 reads up to 8,000 tokens, so detail is welcome, and anything you leave out gets filled with an average.
| Name this | Why it matters | Example |
|---|---|---|
| Subject and action | One clear action per beat reads cleanly | A beekeeper lifts a frame of honeycomb |
| Setting and light | Motivated light sets the whole look | At dawn, low sun through the hives |
| Camera | Kling 4.0 is tuned for stable moves | Slow orbit, tracking shot, push-in |
| Timing | Places each action in the clip | 0-3s: ... 3-8s: ... |
| Sound | Stereo audio follows what you write | Humming bees, a spoon clink |
A single continuous shot follows a mail carrier cycling down through a hillside village in morning light, waving to a neighbor, weaving past flower boxes and a church square, and coasting all the way down to the harbor. No cuts. Sound: bicycle bell, birds, a distant boat horn.
How to time beats and shots in Kling 4.0
Time ranges place each action; numbered shots give you cuts inside one generation. With 30 seconds to fill, both matter more than before. Give each range one main action, and ask for the same character and light across shots.
0-3s: a sealed cream envelope lies on a doormat in morning light. 3-5s: a young girl's hand picks it up. 5-8s: she tears it open and gasps as a shower of tiny paper stars spills out around her. Warm hallway light. Sound: a letterbox clack, paper tearing, a delighted gasp.
How to use keyframes and references in Kling 4.0
Keyframes decide what happens when; references decide who and what it looks like. Give each reference one job, and place keyframes only where the story turns.
| Input | Limit | Use it for |
|---|---|---|
| Keyframes | Up to 10 images | Opening, closing, and in-between story beats |
| Reference images | Up to 10 | Faces, three-view sheets, storyboards, layouts |
| Reference videos | Up to 5, 30s combined | Performance, motion, camera moves, pacing |
| Elements | Up to 7, 3 video-based | Saved characters and products you reuse |
| Voice | Voice samples | How a character sounds |
| Total | Up to 15 | Across images, videos, elements, and voice |
How to direct dialogue and on-screen text in Kling 4.0
Put spoken lines in quotes and name the language and accent. Put on-screen words in capitals and say where they appear. Kling lists English, Chinese, Japanese, Korean, Spanish, Portuguese, German, French, and Hindi, with accents and dialects.
Medium shot in the sunlit ruins of an ancient stone amphitheater: a tour guide in a linen shirt turns to the camera and says in Italian with enthusiasm: "Qui cantavano migliaia di persone." Tourists wander on the steps behind him. Bright afternoon light. Sound: cicadas, footsteps on stone, a light breeze.
Kling 4.0 editing and limits
Kling 4.0 edits existing footage too. Describe only the change, so nothing else is re-rendered.
| Feature or limit | What it means | What to do |
|---|---|---|
| Targeted editing | Up to 5 input clips, 1 primary, 30s combined | Name one change, keep everything else |
| Creative recreation | Reuse a video's pacing with new products or cast | Pair the reference video with your assets |
| Video extension | Up to 2 minutes, listed as coming soon | Plan long pieces as 30s scenes for now |
| 10-bit HDR | 1080p and 4K, listed as coming soon | Grade from SDR until it lands |
| Flash controls | No keyframes or first and last frames | Use full Kling 4.0 for exact frames |
FAQs
Write a shot brief: subject and action, setting and light, camera, timing, and sound. Split anything longer than one beat into time ranges such as 0-3s and 3-8s, and give each range one main action. Kling 4.0 reads prompts up to 8,000 tokens.
Use Flash for drafts, hook tests, and social batches: 3 to 20 seconds at 720p, fast and lower cost. Use Kling 4.0 when a clip needs more than 20 seconds, 1080p or 4K, keyframes, or HDR.
Upload up to 10 images of moments the clip must show, and Kling 4.0 generates the motion between them. Two keyframes pin the opening and closing; more pin the beats between. Keyframes are a full Kling 4.0 feature.
Up to 15 per generation: up to 10 images, 5 video clips totalling 30 seconds, 7 saved elements with 3 video-based, and voice samples.
Clips double from 15 to 30 seconds, frame control grows from start and end frames to 10 keyframes, and audio moves to stereo with tighter lip-sync. Kling 4.0 also adds 8,000-token prompts, a 21:9 ratio, more reference slots, and 10-bit HDR, listed as coming soon.
Yes. It takes up to 5 input clips, one primary, each 3 to 30 seconds and 30 seconds combined. Describe the one change you want, such as a background, an expression, or the style, and the rest of the scene is meant to hold.
Kling 4.0 and Kling 4.0 Flash are coming to Morphic after Kuaishou's October release. The prompt techniques in this guide work on Kling 3.0 in the Morphic video model picker today.