Kling 4.0 vs Veo 3.1 vs Seedance 2.5: Choosing a Flagship Video Model

Three model families now define the top of AI video generation: Kuaishou’s Kling, Google’s Veo, and ByteDance’s Seedance. Kling 4.0 is reported to be close to release, which makes this a good moment to decide how each one fits into your pipeline before the next launch cycle.

This guide compares the models you can use on WaveSpeedAI today, Veo 3.1, Seedance 2.5, and Kling 3.0 and O3, and adds what has been reported for Kling 4.0. Kling 4.0 has no official specification yet, so its column is a list of claims to test, not facts.

Quick answer

• Seedance 2.5: the widest envelope. Up to 30-second clips, up to 4K, six aspect ratios, up to 30 reference images, plus editing and extension endpoints.
• Veo 3.1: short, polished shots. 4, 6, or 8 seconds, up to 4K, native audio, 1 to 3 reference images, and a video-extend endpoint.
• Kling 3.0 and O3: structured storytelling. Up to six shots per request, a native 4K tier, and reusable characters through Kling Elements.
• Kling 4.0: reported to add longer clips and stronger consistency and audio sync. Unconfirmed until release.

Specs at a glance

Values for Veo 3.1, Seedance 2.5, and Kling 3.0 reflect live model parameters on WaveSpeedAI. Kling 4.0 values are reported, not confirmed.

	Veo 3.1	Seedance 2.5	Kling 3.0 / O3	Kling 4.0 (reported)
Availability	Live	Live	Live	Not yet released
Clip length	4, 6, or 8 s	4 to 30 s	3 to 15 s	Beyond 15 s expected
Max resolution	4K	4K	4K tier	4K or higher expected
Aspect ratios	16:9, 9:16	16:9, 9:16, 4:3, 3:4, 1:1, 21:9	16:9, 9:16, 1:1	More ratios reported
Native audio	Yes	Yes	Yes (Standard, Pro, 4K)	Improvements reported
Reference inputs	1 to 3 images	Up to 30 images, plus video and audio	Up to 3 Elements (3.0 image-to-video and O3); O3 adds up to 7 images and a video	Consistency gains reported
Multi-shot per request	Prompt-driven	Prompt-driven	Up to 6 shots	More shots reported
Edit existing video	No dedicated endpoint	Yes	Yes (O3)	Unknown
Extend existing video	Yes	Yes	No dedicated endpoint	Unknown
Faster tier	Veo 3.1 Fast, Veo 3.1 Lite	Seedance 2.5 Turbo	Kling 3.0 Turbo	Unknown

How each family fits a workload

Veo 3.1: short cinematic shots with sound

Veo 3.1 generates fixed 4, 6, or 8-second clips at up to 4K with native audio. The short, fixed lengths suit hero shots, social cutdowns, and B-roll where each clip is a single moment. When you need more time, Veo 3.1 text-to-video pairs with the video-extend endpoint, and Veo 3.1 reference-to-video keeps up to three subjects consistent. Veo 3.1 Fast and Lite cover drafts and high-volume work.

Seedance 2.5: long takes and asset-heavy briefs

Seedance 2.5 has the largest envelope of the three: 30-second clips, six aspect ratios, and up to 30 reference images alongside reference video and audio. Its video-edit and video-extend endpoints make it the easiest fit for revise-and-extend workflows. E-commerce teams with multi-angle product sets and short-drama teams shooting long beats tend to land here.

Kling 3.0 and O3: scripted scenes and recurring characters

Kling 3.0 is built for storyboards: up to six shots in one request, with automatic or custom shot splitting, and a native 4K tier with the same inputs as Standard and Pro. Kling O3 adds reference-to-video and video editing, and Kling Elements, accepted by Kling 3.0 image-to-video and O3, keep characters consistent across a series.

Kling 4.0: what to watch for

The Kling 4.0 reports focus on four things: longer clips, stronger character and scene consistency, better audio-video sync, and sharper detail in hands, fabric, and lighting. If those hold, Kling 4.0 would compete directly with Seedance 2.5 on long-form commercial work while keeping Kling’s multi-shot structure. We will update this comparison once Kuaishou publishes official specifications.

Choose by job, not by leaderboard

Most production teams end up routing different jobs to different models. A reasonable starting point:

Job	Start with	Why
6 to 8-second hero shot with sound	Veo 3.1	Fixed short lengths, 4K, native audio
15 to 30-second single take	Seedance 2.5	Longest clip length of the three
Product clip from many photos	Seedance 2.5	Up to 30 reference images
Scripted ad with a shot list	Kling 3.0	Up to 6 shots per request
Series with a recurring character	Kling O3 with Elements	Reusable characters
Revise an approved clip	Seedance 2.5 or Kling O3	Dedicated edit endpoints
Fast drafts	Veo 3.1 Fast, Seedance 2.5 Turbo, or Kling 3.0 Turbo	Faster tiers with the same request shape

When Kling 4.0 arrives, re-run the rows where it is expected to compete: the long single take, the recurring character, and dialogue-heavy scenes.

One routing table, one API

All three families share the same WaveSpeedAI request flow: submit to the model path, receive a prediction ID, poll for the result. That makes routing a lookup rather than three integrations:

ROUTES = {
    "hero_shot": "google/veo3.1/text-to-video",
    "long_take": "bytedance/seedance-2.5/text-to-video",
    "shot_list": "kwaivgi/kling-v3.0-pro/text-to-video",
    "character_series": "kwaivgi/kling-video-o3-pro/reference-to-video",
}

Adding Kling 4.0 on launch day is one more entry, and moving a job type to it is a one-line change. To compare the models on the same prompt before writing any code, use the WaveSpeedAI Video Generator.

Pricing

All three families are billed per second of generated video on WaveSpeedAI, with rates that depend on resolution or tier and on whether audio is enabled. Current rates are on the Veo 3.1, Seedance 2.5, and Kling 3.0 API pages. Kling 4.0 pricing will be published at launch.

Bottom line

There is no single best video model in 2026, and Kling 4.0 will not change that. Veo 3.1 is the short-shot specialist, Seedance 2.5 has the widest envelope, and Kling 3.0 and O3 are the most structured for scripted and character-driven work. Kling 4.0 is reported to close the gap on length and consistency; keep your routing table flexible and test it on your own prompts when it lands.

Related reading: Kling 4.0 vs Kling 3.0, Kling 4.0 vs Seedance 2.5, and Kling 4.0 Is Coming: What We Know.

FAQ

Which is the best AI video model: Kling 4.0, Veo 3.1, or Seedance 2.5?

It depends on the job, and Kling 4.0 is not released yet. Today, Seedance 2.5 leads on clip length and reference inputs, Veo 3.1 is a strong fit for short cinematic shots with native audio, and Kling 3.0 and O3 lead on multi-shot prompts and reusable characters. Re-test once Kling 4.0 is live.

Which of the three supports the longest clips?

Among the models live on WaveSpeedAI today, Seedance 2.5 generates 4 to 30 seconds per request, Kling 3.0 generates 3 to 15 seconds, and Veo 3.1 generates 4, 6, or 8 seconds and offers a separate video-extend endpoint. Kling 4.0 is reported to go beyond 15 seconds, which is unconfirmed.

Do all three generate audio?

Seedance 2.5, Veo 3.1, and Kling 3.0 Standard, Pro, and 4K all have a native audio option on WaveSpeedAI. Kling 4.0 is reported to improve audio-video sync, which is unconfirmed.

Can I use all three through one API?

Yes. On WaveSpeedAI all three families use the same submit-and-poll request pattern, so you can route each job to a different model by changing the model path.