Kling 4 vs Kling 3 Omni: what actually changes

Availability as of October 2026

Kling 3.0 Omni was announced by Kuaishou on February 6, 2026. It is available in Kling's own app and through API providers such as fal.ai, with published per-second prices.

Kling 4.0 went through an early-access phase from late September and officially launched in Kling's app on October 15, 2026, according to Kuaishou. Kling also offers a faster, cheaper Kling 4.0 Flash mode. The developer API is still marked as coming soon. fal.ai lists Kling 4.0 with prices, but its model page says API access is coming soon and limits use to its playground.

Specs side by side

Clip length. Kling 3.0 Omni generates up to 15 seconds per request. Kling 4.0 generates 3 to 30 seconds, adjustable in one-second steps, per Kling's guide.

References. Kling 3.0 Omni takes up to 7 images or elements, or one reference video of 3 to 10 seconds plus up to 4 images or elements. An element combines up to four images of one subject from different angles. Kling 4.0's Omni Reference takes up to 15 inputs in total: up to 10 images, up to 5 videos with 30 seconds combined, up to 7 elements, and up to 3 voice profiles.

Resolution and format. Kling 3.0 Omni outputs 720p or 1080p. Kling 4.0 lists 720p, 1080p and 4K, and adds 21:9 to 16:9, 1:1 and 9:16. A 10-bit HDR option is described as coming soon.

Control and audio. Kling 3.0 Omni supports start and end frames, multi-shot generation and optional native audio, with a voice that can be bound to an element. Kling 4.0 adds a keyframe mode with up to 10 keyframes and stereo audio. Video extension up to two minutes is marked as coming soon.

Price on fal.ai. Kling 3.0 Omni reference-to-video costs $0.084 per second on Standard and $0.112 on Pro with audio off, or $0.112 and $0.14 with audio on. fal.ai lists Kling 4.0 at $0.157 per second at 720p and $0.235 at 1080p, though the API is not open yet.

What the differences mean for consistency

More reference slots matter most. With Kling 3.0 Omni, four angles per element is enough for a face or a simple product, but tight for a character with a distinctive outfit, or a product with several important sides. Kling 4.0's larger budget means fewer angles the model has to invent.

Longer clips cut both ways. A 30-second shot avoids a cut between two 15-second clips, which is where drift often shows. But a longer generation gives the model more time to wander. Until we can run the same references through both models, we would not assume a 30-second Kling 4.0 clip holds a face better than two well-matched Kling 3.0 clips.

Keyframes help with planned sequences. They let you pin a character's position and pose at several points, which is useful for storyboarded ads. For loose social clips, the reference set does more work.

What we have not verified

We have not run side-by-side tests of Kling 4.0 against Kling 3.0 Omni with identical references, so this page makes no claim about which keeps a face or a label more faithfully. The Kling 4.0 figures above are Kling's published specifications, not results we measured. We will add a test with the same characters and products once Kling 4.0 is available through an API.

Which to pick for consistent characters and products

Use Kling 3.0 Omni if you need to ship now, need an API, or need predictable costs. Keep each shot within 15 seconds, give every subject a clean main image plus its best three angles, and plan cuts between clips.

Plan for Kling 4.0 if your work depends on long single takes, more than four angles of a subject, or 4K delivery. Prepare a larger reference set now. Extra angles do no harm with Kling 3.0 and pay off when Kling 4.0 opens.

RefVid runs on Kling 3.0 Omni today and will switch to Kling 4.0 when its API opens. Your saved characters and products carry over, so the reference images you upload now keep working after the switch.