Kling 4.0 发布：30 秒立体声、15 参考、MCP 接入
梳理 Kling 4.0 规格：单次 30 秒带立体声、最多 15 个参考、10 关键帧、可改已有视频并接入 MCP；但 Flash 仅 20 秒 720p 无关键帧，4K/HDR/API 未上线，Seedance 2.5 已支持 30 秒 4K。
kling 4.0 is out and everyone's calling it the video model killer here's what it actually does: 30 second clips with stereo sound in one generation up to 15 references per task: images, videos, voices up to 10 keyframes to control the shot edit a video you already made: motion, camera, background, objects plugs into ai agents through mcp the 30s part is the headline. a year ago 8 seconds was a flex now the fine print the cheap flash version tops out at 20s and 720p, no keyframes 4k, hdr and the api are still "coming soon" it's not on any independent leaderboard yet. the reviews so far are hosted by kling itself and seedance 2.5 already does 30s with 4k so not a killer. a real contender that finally caught up on length the reel below is theirs. judge for yourself