Kling AI Models Compared: 4.0, Flash, 3.0, O1 and 2.6

Pick Kling 4.0 when one generation has to carry a whole scene: it runs 3 to 30 seconds, takes up to 15 reference assets and speaks nine languages. Pick Kling 4.0 Flash for fast 720p drafts up to 20 seconds. Pick Kling 3.0 or 3.0 Omni when you need to know the credit cost before you start, because they are the newest models with published per-second rates. VIDEO O1 and VIDEO 2.6 are older; Kling itself upgraded 2.6 to 3.0 and O1 to 3.0 Omni, so they now earn a place only in narrow jobs. That is the November 2026 picture in one paragraph.

Kling 4.0: the 30-second model with two pieces still missing

In November 2026 Kling's newest video model is Kling 4.0, released to all users on October 15, 2026, with a cheaper, faster Kling 4.0 Flash beside it. Early access had started in September 2026. The headline change is length: a single generation runs 3 to 30 seconds, with multi-shot on by default so the model splits the clip into shots by itself ^[1]. Aspect ratios are 21:9, 16:9, 1:1, 9:16 and Auto. Prompts can run to 8,000 tokens, which leaves room for a scene-by-scene script.

Kling 4.0 has two entry points, and you choose one per task. Omni Reference is the default and also covers plain text to video; it takes up to 15 assets, split as up to 10 images, 5 videos, 7 elements (no more than 3 of them video-based) and voice profiles. The video slots are shared: reference clips, clips to edit and video elements together stay within 5 clips and 30 seconds. Keyframes is image-only and accepts up to 10 keyframe images placed as first, last or middle frames anywhere on the timeline. The two modes cannot be combined. Kling's own advice is Keyframes when visuals must land at set moments, Omni Reference when you are mixing references or exploring.

Audio is generated with the picture in two-channel stereo. Speech covers Chinese, English, Japanese, Korean, Spanish, Portuguese, German, French and Hindi, plus dialects and accents. The only audio you can feed in is a voice reference; music and sound effects come from the model, not from an upload. Kling also says 4.0 renders legible on-screen text, emoji and logos. Editing takes up to 5 input clips, one of them primary, each 3 to 30 seconds and no more than 30 seconds combined.

Two things are not finished. Video extension (up to 2 minutes in total) and 10-bit HDR at 1080p and 4K were both listed as coming soon in November 2026 ^[2]. Neither is live yet. Kling lists 4K output for Kling 4.0 in its user guide; 10-bit HDR is still coming soon. For now, a 4.0 clip ends at 30 seconds. Plan around that.

Kling 4.0 Flash: the volume option, capped at 720p

Flash keeps the 4.0 creation flow but trims it. It offers text to video, image to video from a first frame, and Omni Reference, at 3 to 20 seconds, 720p only and 8-bit SDR. It has no start-and-last-frame mode and no multiple keyframes. Kling built it for high-frequency creation, meaning faster generation at lower cost, and it recommends the full 4.0 instead whenever you need longer clips, higher resolution or precise frame control. That makes Flash a good fit for social drafts, concept tests and vertical clips where 720p is the delivery size anyway.

There is one gap both 4.0 models share. Kling does not publish a per-second credit rate for Kling 4.0 or 4.0 Flash on its plans or guides; the cost appears on the Generate button before you confirm. So cheaper is Kling's description, not a number you can budget against. The developer API does list unit rates for both, but API units are a separate currency from app credits.

Kling 3.0 and 3.0 Omni: the models you can price in advance

Kling 3.0 and 3.0 Omni arrived in January 2026 as the upgrades of 2.6 and O1, which remain available. Both run 3 to 15 seconds per generation. Multi-Shot plans shot changes automatically, and Custom Multi-Shot lets you set up to six shots in one generation, each with its own length. Native audio covers five languages (Chinese, English, Japanese, Korean and Spanish) with dialects and accents; dialogue written in another language is translated into English. A native 4K mode for the 3.0 series has existed since April 2026.

The split between them is about input. Kling 3.0 is prompt-led: text to video, image to video, start and end frames, and three or more characters kept consistent across a scene. It also keeps text from uploaded images, such as signs and logos, consistent. Kling 3.0 Omni is reference-driven: up to 7 images or elements without a video input, or 4 alongside one reference video of 3 to 10 seconds. It can build a character element from a 3 to 8 second clip, voice included. Its editing has handled 3 to 15 second clips, with 4K in and out, since June 2026. With a video input, native audio is off.

The rates are what set this pair apart from 4.0. Kling 3.0 costs 6 credits a second at 720p and 8 at 1080p without native audio, 9 and 12 with it, and Voice Control adds 2 ^[3]. 3.0 Omni matches those rates without a video input and charges 12 (720p) or 16 (1080p) with one. Native 4K costs 30 credits a second. By our arithmetic, a 15-second 1080p clip with native audio is 180 credits, and 10 seconds of native 4K is 300.

Where Kling 3.0 Turbo fits

Kling 3.0 Turbo, released in June 2026, is the faster option inside the 3.0 series, with the same multi-shot storyboard logic and audio-visual sync. Speed is its point. Kling publishes no consumer credit rate for it either, so it sits outside any budget you build from the 3.0 rates above. Treat it as a speed choice. Check the button price first.

VIDEO O1 and VIDEO 2.6: older, and only for narrow jobs

VIDEO O1 launched in December 2025 as Kling's unified model: reference-based generation, text to video, start and end frames, and editing by text command, such as removing bystanders or turning day into dusk, without masks. It runs 3 to 10 seconds at 720p or 1080p and has no native audio. Its rates are 6 credits a second at 720p and 8 at 1080p without a reference video, 9 and 12 with one. By our arithmetic a 10-second 1080p clip is 80 credits without a reference video and 120 with one. Those reference-video rates sit below 3.0 Omni's, which makes O1 the cheaper published route for silent edits of an existing clip.

VIDEO 2.6 was the first Kling model with native audio. It offers 5 or 10 second clips, and its voices speak only Chinese and English; other languages are translated to English. It has the lowest published rate in the lineup: 3 credits a second in Standard mode without audio, 5 in Professional mode, and 10 in Professional with native audio ^[4]. Voice Control is free for subscribers. Kling's own comparison lists what 2.6 lacks: multi-shot, element reference with a start frame, multilingual speech and 15-second output. Choose it for short, silent filler clips where every credit counts.

Motion Control keeps the same split. VIDEO 3.0 Motion Control costs 9 credits a second in Standard mode and 12 in Professional, and adds face binding for steadier faces. The 2.6 version costs 5 and 8. Kling says face binding keeps faces steadier in 3.0. By our arithmetic a 10-second 3.0 Motion Control clip is 90 credits in Standard mode and 120 in Professional.

Which model for which job

The choice comes down to clip length, input type and whether you need a budget in advance. Nothing here ranks quality; Kling's own benchmark claims are its internal tests. Results also vary from run to run, so expect retries on any model, and our Kling AI prompt guide covers how to cut them.

A finished ad or short film in one take points to Kling 4.0, because nothing else reaches 30 seconds. A storyboard that must hit set frames points to 4.0 Keyframes. A fixed monthly budget points to 3.0: on the Standard plan's 660 credits, by our arithmetic, that buys 55 seconds of 1080p with native audio or 22 seconds of native 4K. The Pro plan at $32.56 a month carries 3,000 credits, which works out to 250 seconds of 3.0 at 1080p with audio. Silent text-led edits of existing footage fit O1, and cheap silent filler fits 2.6.

Whatever you pick, the plan rules stay the same. Free accounts generate at 720p, one video at a time, with the Kling watermark, while Professional mode, 1080p, 4K, extension, watermark removal and commercial use need an active paid plan; what the free tier allows covers the details. Monthly plan credits also expire after 31 days without rollover, so match the plan to the seconds you will actually render.

The bottom line

Kling 4.0 is the model for length and control: 30-second takes, 15 references, 10 keyframes and nine speech languages. Its weak spot is budgeting, with no published credit rate and extension and HDR still listed as coming soon. Kling 3.0 and 3.0 Omni remain the predictable workhorses, with posted rates and native 4K. Flash suits volume at 720p. O1 and 2.6 survive for cheap silent clips and text-led edits. Choose by job, then confirm on the Generate button.