Kling 4.0's API reaches Luma, YouCam and SelfyzAI

Kuaishou's Kling 4.0 is now running inside three third-party platforms, after each added the video model within days of its API opening. Luma, Perfect Corp's YouCam and SelfyzAI all announced the integration on October 23, eight days after Kling made the model public.

Luma's news post says Kling 4.0 is available to every Luma customer inside the project board, for text-to-video and image-to-video in 16:9, 9:16, 1:1 and 21:9. YouCam's release says it is among the first platforms to integrate the newly released Kling 4.0 API across mobile and web, with up to 10 keyframes and up to 30 seconds per generation, lip-synced dialogue, stereo sound, 9+ languages, and "trend remakes" that reuse a reference video's pacing. SelfyzAI put Kling 4.0 in its workspace model picker.

Kling 4.0 is the newest video model from Kuaishou's Kling AI. Kling's release note says the model became available to everyone on October 15. The note lists single takes from 3 to 30 seconds, up to 10 keyframe images, 720p, 1080p and 4K output, two-channel stereo audio, a 21:9 aspect ratio, and an 8,000-token prompt limit. Omni Reference combines up to 15 items across images, videos, voice references and elements.

The API trail is murkier than the platform launches. SelfyzAI's announcement states the Kling 4.0 API service launched on October 22 and is gradually opening to enterprise customers and developers worldwide. Kling's own developer pricing page still labels the Kling 4.0 API "Coming Soon" and calls its listed prices preview-only and unusable before launch. A banner there says the API is in early access, and Kling has not posted the October 22 date on the pages we could read.

On price, the XinYu AI changelog for October 23 puts 5 seconds at 95 credits at 720p and 142 credits at 1080p, and says keyframe support depends on length: 4 keyframes at 3 seconds, one more per extra second, and 10 from 9 seconds up. Kling's own page previews 1.0 Unit per second at 720p and 1.5 at 1080p with no video input, under the same caveat. A the-decoder write-up adds a lighter Kling 4.0 Flash capped at 720p and 20 seconds, and reports 10-bit HDR at 4K/1080p and a two-minute extension both listed as coming soon.

For a creator, the practical change is that one board can now mix Kling 4.0 with whatever else lives on Luma, YouCam or SelfyzAI, so the model reviewers could not reach through an API last week is one picker entry away. No independent test of the API route is in hand.

Kling 4.0 is live in Luma and YouCam now and sits in SelfyzAI's workspace picker; the Kling 4.0 API itself remains early access on Kling's own developer page.