Kling 4.0 is the next Kling video model from Kuaishou, currently in pre-release testing. Leaked Kling 4.0 settings show 30-second clips, up to 10 keyframes, and up to 15 references per shot. Kling 4.0 is coming to reAPI; Kling 3.0 is live today.
Kling 4.0 is the fourth generation of Kuaishou's Kling video model. As of September 25, 2026, Kuaishou has not announced Kling 4.0, published specs, or opened an API. What exists is a leak: on September 24, 2026, screenshots from the Dev Mode Discord (@MarsForTech) showed "VIDEO 4.0 Preview" and "VIDEO 4.0 Flash Preview" in Kling's creator app, with 3–30 second clips, 720p and 1080p, and a keyframe mode with up to 10 frames. Treat every Kling 4.0 spec on this page as unconfirmed until Kuaishou publishes it.
Real-world workflows and production use cases you can build and ship with this model.
Kling 3.0 tops out at 15 seconds per clip. The leaked Kling 4.0 settings go to 30 seconds, and an experimental Long Video mode reaches 120 seconds at up to 1080p. If that ships, a full product demo or scene fits in one generation instead of three stitched clips.
The Kling 4.0 Preview panel shows first, middle, and last frame slots and a keyframe mode with up to 10 frames. You pin where the shot starts, where it passes, and where it lands, and Kling 4.0 fills the motion between them.
Kling 4.0 reportedly accepts up to 15 references in one request: 10 images, 5 videos, and 7 Elements, plus up to 3 voice references. That is the part to watch for brand mascots, recurring characters, and series content.
Kling 3.0 is live on reAPI now at /models/kling-3-0: text-to-video, image-to-video, multi-shot, native audio, up to 4K. Ship on it today and move to Kling 4.0 when it lands.
Your reAPI key already covers Kling, Seedance, Veo, Wan, and the rest. When Kling 4.0 goes live, it is a new model id on the same /api/v1/videos/generations endpoint, not a new vendor account.
reAPI bills by the second of output, and credits never expire. Kling 4.0 rates will be posted on this page at launch; nobody has published official Kling 4.0 pricing yet.
Kling 3.0 values are from the live model on reAPI. Kling 4.0 values come from the September 24, 2026 leak and may change before release.
Kling 4.0 values are from leaked pre-release settings, not an official Kuaishou spec. This table will be replaced with official values at launch.
Sign up and create a key in the dashboard, no card required. The same key will work for Kling 4.0 at launch.
OpenWire up /api/v1/videos/generations with model kling-3-0 today. The request and task flow will be the same for Kling 4.0.
OpenWhen Kling 4.0 goes live, change the model to kling-4-0. Final parameters and per-second rates will be posted here on launch day.
Opencurl -X POST https://reapi.ai/api/v1/videos/generations \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "kling-4-0",
"prompt": "A lighthouse keeper climbs a spiral staircase at dawn"
}'Rejected synchronously with the failing field named. Check enum values, ranges, and URL fields — nothing is charged.
401 means a missing or invalid Bearer key; 402 means the reserve exceeds your balance. Manage keys and credits in the console.
Reference material and outputs pass automated moderation. Rejected tasks fail with a clear error and a full refund.
A task that reaches a failed state is never charged — the reserve refunds automatically. Keep the task id and retry when ready.
Common questions about this model.
Guides
Kling 4.0 has no official release date yet. What Kuaishou has confirmed, what the September 24 leak shows (30s clips, 10 keyframes), and how far to trust it.
Guides
Kling 3.0, 3.0 Omni, 3.0 Turbo, O1, 2.6, and 2.5 Turbo compared on duration, resolution, audio, and references, plus which Kling model fits each job.
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