API Coming Soon

Kling 4.0

Kling 4.0 API — Specs Preview, Coming to APIMart

Discover 30-second storytelling, up to 4K output, flexible keyframes and multimodal creative control. Kling 4.0 is scheduled for October 2026; Flash has limited early access. APIMart API access is coming soon.

API Coming Soon3–30 SecondsUp to 4KMultimodal ReferencesStereo Audio

Kling 4.0 & Flash Preview

Official model specifications, with APIMart API access still coming soon

API Coming Soon

Kling 4.0 and Flash: two distinct video models

Kuaishou has announced Kling 4.0 for October 2026 and opened limited Flash access on September 28. This page presents the official model capabilities; APIMart availability, supported API parameters and pricing will be confirmed separately.

Kling 4.0: 3–30 seconds, 720p / 1080p / 4K, first and last frames, and up to 10 keyframes
Kling 4.0 Flash: 3–20 seconds, 720p, 8-bit SDR, text-to-video, first-frame image-to-video and multimodal references
10-bit HDR and repeated video extension up to 2 minutes are announced as coming soon

Updated September 28, 2026

Read the official Kling 4.0 announcement Explore the Kling 4.0 Flash preview

Announced Kling 4.0 capabilities

Main-model specifications are listed below; Flash has its own limits. Availability through APIMart will be confirmed after integration.

Stories up to 30 seconds

Generate 3–30-second videos from text or images, with first-and-last-frame control. Longer continuous shots support action, scene changes and complete narrative beats.

Up to 10 flexible keyframes

Guide a sequence with up to 10 keyframe images, defining character states, scene changes and key moments throughout the story.

Multimodal creative references

Combine up to 15 reference items: up to 10 images, 5 videos totaling 30 seconds, and 7 subjects, including up to 3 video subjects. Video-subject duration counts toward the video limit; voice references are also supported.

Targeted video editing

Add, replace or remove subjects and backgrounds, or adjust style, color and viewpoint. Editing accepts up to 5 videos including one main video; each is 3–30 seconds and their combined duration cannot exceed 30 seconds.

Stereo sound and expressive speech

Dual-channel stereo, improved lip synchronization and voice references support dialogue, effects and ambience. Languages include Chinese, English, Japanese, Korean, Spanish, Portuguese, German, French and Hindi.

Multilingual text and longer prompts

Generate multilingual text, emoji and logos within video. Prompts accept up to 8000 tokens to describe subjects, actions, composition and camera direction.

Up to 4K and wider framing

Output at 720p, 1080p or 4K, with 21:9, 16:9, 1:1, 9:16 and intelligent aspect ratios. 10-bit HDR output at 1080p and 4K is announced as coming soon.

Flash for frequent creation

Kling 4.0 Flash targets efficient, cost-effective creation with 3–20-second video at 720p and 8-bit SDR. Its announced modes are text-to-video, first-frame image-to-video and multimodal references.

Creative workflows to explore

Applications of the announced capabilities for teams preparing future Kling 4.0 workflows.

Film and story previsualization

Use longer shots and keyframe guidance to explore camera movement, action and scene progression before production.

Advertising and creative adaptation

Reference video pacing and camera direction while introducing your own products, characters and brand assets.

E-commerce product videos

Combine product images with motion references to plan demonstrations, reveals and lifestyle scenes.

Social content and rapid iteration

Explore short-form concepts and creative variations with Flash’s focus on efficient, frequent generation.

Character-led narratives

Combine subject references and keyframes to guide recurring characters and narrative continuity.

Multilingual dialogue scenes

Develop scenes with dialogue, sound effects and ambience using stereo audio, lip synchronization and multilingual speech.

Kling 4.0 API FAQ

Official release plans, model differences and upcoming APIMart access.

What is Kling 4.0?

Kling 4.0 is Kuaishou’s announced next-generation AI video model. Its published capabilities include 3–30-second generation, up to 4K output, up to 10 keyframes, multimodal references, stereo audio and video editing.

When will Kling 4.0 be released?

The official announcement schedules Kling 4.0 for October 2026. Kling 4.0 Flash opened limited early access on September 28, 2026. These are Kuaishou’s release plans; APIMart API availability will be announced separately.

How does Kling 4.0 differ from Flash?

Kling 4.0 is announced with 3–30-second generation at 720p, 1080p or 4K, plus first-and-last-frame and flexible-keyframe control. Flash lists 3–20-second generation at 720p and 8-bit SDR, with text-to-video, first-frame image-to-video and multimodal references. Main-model limits should not be assumed to apply to Flash.

What reference limits have been announced?

For Kling 4.0, the combined total is up to 15 image, video, voice and subject reference items. Individual limits are 10 images, 5 videos totaling at most 30 seconds, and 7 subjects including at most 3 video subjects. Video-subject duration counts toward the video total. Supported APIMart API fields will be documented after integration.

Can I use the Kling 4.0 API on APIMart now?

Not yet. This is a preview of the announced models. APIMart will publish supported models, endpoints, parameters and availability after integration is confirmed; early access on Kling’s own platform does not mean APIMart API access is live.

How much will the API cost on APIMart?

APIMart pricing for Kling 4.0 and Flash has not been announced. Model-specific credit prices and billing rules will be published when access is confirmed.

Are HDR and 2-minute videos available now?

The official announcement marks 10-bit HDR at 1080p and 4K, and repeated video extension up to 2 minutes, as coming soon. Two minutes refers to the result of repeated extensions, not a single generation; the main model’s announced single-generation duration is 3–30 seconds.

How can I contact support for help?

You can reach us via the live chat in the bottom-right corner, email us at [email protected], or join our Discord community. Our team will get back to you as soon as possible.

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