What changed in Kling 4.0
Versus Kling 3.0 (5 February 2026): maximum clip length doubles from 15 to 30 seconds, audio moves to two-channel stereo, control grows to 10 keyframes and 15 references with 8,000-token prompts, reference videos can now steer performance, camera movement and pacing, and a creative recreation mode swaps products or characters into a reference video's structure. Kling 3.0 already had native 4K; on 4.0, 10-bit HDR and two-minute extension are still announced as coming soon. Kling 3.0 and 3.0 Turbo remain available, and 3.0 keeps the published API pricing.
How to get Kling 4.0
Since 15 October 2026 the full model is available on the Kling AI web platform and app, paid in Kling credits, and through the Kling MCP and CLI. Kling's official developer API is rolling out in preview without a published price, and third-party hosts such as fal now serve Kling 4.0 at $0.157 to $0.235 per second.
What Kling 4.0 means for short-form marketers
Thirty seconds is the length that matters. Most short-form ads that convert run 15 to 30 seconds, and until now every frontier model topped out around 15, which meant stitching two or three generations and fighting continuity at every cut. A single 30-second generation with up to 10 keyframes is close to directing a full ad from a shot list: hook, problem, product, proof, call to action.
Creative recreation is the sleeper feature: hand Kling 4.0 a reference video whose structure already works and it rebuilds that pacing and composition around your product. Kuaishou pitches it directly at ads, beauty, fashion and consumer electronics.
The usual QA still applies: hands, on-screen text and logos need a human check, and longer clips give a model more room to drift, so review the back half of every 30-second render as closely as the hook.
