Kling 4.0 Arrives in October: Every Official Spec, and What Flash Can Do Today

Kling 4.0 is scheduled for an unspecified October launch, while Kling 4.0 Flash entered limited early access on September 28 for Ultra Yearly subscribers. The full model is expected to generate 3- to 30-second videos at up to 4K resolution, support up to 10 keyframes, 15 mixed image and video references, stereo audio, and prompts of up to 8,000 tokens, representing major gains in duration and creative control over Kling 3.0. Flash currently offers a narrower 3- to 20-second, 720p, 8-bit SDR experience and does not officially list first-and-last-frame or multi-keyframe controls, making it unsuitable for evaluating all of the full model’s capabilities. Although 10-bit HDR output and up-to-two-minute video extension appear in the specifications, both are labeled as coming soon, while native 4K output was introduced before the 4.0 announcement. For immediate projects, the text recommends using existing Kling 3.0 or O3 models through services such as Atlas Cloud, reserving Flash for short concept work and waiting for the full release for high-resolution, client-facing, or tightly storyboarded productions.

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