Kling 4 vs Seedance 2.5: two 30-second reference models
Kling 4.0 and Seedance 2.5 both generate clips of up to 30 seconds from many references. As of October 2026 the practical differences are access, resolution and rules. Seedance 2.5 has a public API on fal.ai, but tops out at 720p there and reportedly rejects real human faces in references. Kling 4.0 lists 1080p and 4K, but has no public API yet. Here is what each offers, with sources, and what we could not confirm.
Status and access
ByteDance's cloud unit, Volcano Engine, showed Seedance 2.5 at its FORCE conference in June 2026, according to The Decoder. As of October 2026 it is callable through fal.ai's API, with text-to-video, image-to-video and reference-to-video endpoints, according to fal's Seedance 2.5 page.
Kling 4.0 officially launched in Kling's app on October 15, 2026, after an early-access phase that began on September 28, according to Kuaishou. Its developer API is marked as coming soon. fal.ai lists Kling 4.0 in its playground, but its model page says API access is coming soon.
References
Seedance 2.5's reference-to-video endpoint accepts up to 50 references: up to 30 images, up to 10 videos and up to 10 audio clips, according to fal.ai. Reference videos are capped at 30 seconds in total, and so is reference audio.
Kling 4.0's Omni Reference takes up to 15 references: up to 10 images, up to 5 videos with 30 seconds combined, and up to 7 elements, according to fal's Kling 4.0 guide. Elements group images of one subject together, so the model knows which images belong to the same character or product.
Thirty images is more than most subjects need: a handful of clean angles covers a face or a product. The larger budget mainly helps when a scene has several characters, props and a location that all need to stay fixed.
Clip length, resolution, audio
Seedance 2.5 on fal.ai generates 4 to 30 seconds, or lets the model choose the length, at 480p or 720p. Aspect ratios are 21:9, 16:9, 4:3, 1:1, 3:4 and 9:16, or automatic. Audio is generated by default and can be switched off, according to fal's model page. fal's comparison notes that Seedance 2.0 also offered 1080p and 4K, so 2.5 trades resolution for length.
Kling 4.0 generates 3 to 30 seconds at 720p, 1080p or 4K, in 21:9, 16:9, 1:1 or 9:16, with stereo audio and up to 10 keyframes, according to fal's Kling 4.0 guide. Its Flash mode is limited to 20 seconds at 720p. A 10-bit HDR option is described as coming soon.
On resolution, Kling 4.0 is ahead: 1080p and 4K are outputs Seedance 2.5 does not offer on fal.ai. On access, Seedance 2.5 is ahead: you can call it today.
Faces and content rules
This is the difference most likely to decide for you. In Adobe's community forum, users report the error "reference content can't include real human faces" on both Seedance 2.0 and 2.5, and an Adobe community manager confirmed that Seedance 2.0 does not support real faces in references. A Renderforest guide says Seedance 2.5 in ByteDance's Dreamina requires live verification for photoreal faces.
We found no official ByteDance documentation of the 2.5 policy, and fal's model page does not mention one, so test with your own references before you commit.
In practice, Seedance 2.5 is the easier choice for products, mascots, stylized and anime characters. For a real presenter or a photoreal human creator, expect friction. Kling has its own moderation; we have not tested both models with the same face references.
Price
On fal.ai, Seedance 2.5 reference-to-video costs about $0.47 per second at 720p and $0.22 at 480p without video references, or about $0.28 and $0.13 with video references, billed by tokens, according to fal's model page. A 10-second 720p clip without video references is about $4.73.
We could not confirm a Kling 4.0 API price: fal's Kling 4.0 page lists none while its API is closed. Kling 3.0 Omni, its predecessor, costs $0.084 to $0.14 per second on fal.ai, depending on tier and audio.
Which to pick for consistent characters and products
Pick Seedance 2.5 for products, mascots and stylized characters when you need clips longer than 15 seconds through an API today and 720p is enough, especially for scenes with several fixed elements. Check composition at 480p first, which costs less than half as much per second.
Pick Kling for real human faces and for 1080p or higher. Today that means Kling 3.0 Omni through the API, up to 15 seconds per clip; when Kling 4.0's API opens, it lists longer takes, more references and 4K. We have not run both models with the same references, so this verdict is about access, specs and rules, not measured fidelity.
RefVid runs on Kling 3.0 Omni today and will switch to Kling 4.0 when its API opens. It does not offer Seedance 2.5.
Frequently asked questions
- Is Seedance 2.5 the latest Seedance model?
- As of October 2026, Seedance 2.5 is the newest Seedance model on fal.ai, following Seedance 2.0. We found no official announcement of a Seedance 3.
- Can I use real people's faces as references in Seedance 2.5?
- Expect restrictions. Users report that Seedance 2.0 and 2.5 reject reference images containing real human faces, and Dreamina reportedly requires live verification for photoreal faces. We found no official ByteDance policy for 2.5, so test before you plan a project around it.
- Which has more reference slots, Kling 4 or Seedance 2.5?
- Seedance 2.5: up to 50 references on fal.ai, including 30 images, 10 videos and 10 audio clips. Kling 4.0 lists up to 15, including 10 images, 5 videos and 7 elements.
- Do Kling 4 and Seedance 2.5 both make 30-second clips?
- Yes, on paper. Seedance 2.5 generates 4 to 30 seconds through fal.ai's API today, at up to 720p. Kling 4.0 generates 3 to 30 seconds in Kling's app, or up to 20 in Flash mode, and has no public API as of October 2026.