Until this summer, most AI video models stopped at 15 seconds or less per clip. Since July three models have moved the ceiling to 30 seconds in one take: Seedance 2.5 from ByteDance, Wan 3 from Alibaba and Kling 4 from Kuaishou. All three run inside Postlaty, so I get asked the same question every week: which one should I use for TikTok, Reels and Shorts?
The honest answer depends on the job, not on a benchmark. This guide compares the three on what actually changes your week: clip length, resolution, what each second costs in tokens, and what each model can do in Postlaty today. Then it shows how to test all three on one prompt and schedule the winner.
Three models, one new length: 30 seconds
Here is what each company announced, from their official launch pages:
Seedance 2.5 (ByteDance), July 2026
Launched on 31 July 2026. Up to 30 seconds of video and audio in one pass, multi round extension of an existing output, and a large reference set of images, clips and audio in a single request.
Wan 3 (Alibaba), August 2026
Public beta on 6 August, general availability on 24 August 2026. Up to 30 seconds per clip, with editing and video extension, and documents and web pages as possible inputs on Alibaba Cloud Model Studio.
Kling 4 (Kuaishou), October 2026
Kling 4.0 officially launched on 15 October 2026. It generates 3 to 30 seconds in one pass, with steadier fast motion, stronger camera direction, up to 10 keyframes and 21:9 framing on the Kling app.
The shared headline is length. A 30 second take can hold a hook, a demo and a payoff, which is the whole shape of a good short. The differences are in control, price per second and how you get past 30 seconds.
Kling 4 vs Seedance 2.5 vs Wan 3 in Postlaty
These are the settings and prices you see in the Postlaty generator, not the API rates on each vendor's site. Postlaty charges tokens per second of output.
Wan 3: the cheapest seconds
2 to 30 seconds. 480p, 720p or 1080p at 1, 2 or 4 tokens per second. Sound is generated with the picture. Ratios include 9:16, 16:9, 1:1, 4:3, 3:4 and adaptive.
Kling 4: the cinematic middle
3 to 30 seconds. 720p or 1080p at 3 or 5 tokens per second. Ratios are 9:16, 16:9, 1:1 and the wide 21:9. Kuaishou built this release for camera moves and fast action.
Seedance 2.5: the longest stories
4 to 30 seconds. 480p, 720p or 1080p at 2, 5 or 12 tokens per second. Sound and lip sync in the same pass, reference images, clips and audio, and the only one with Extend.
Here is what one full 30 second take costs at 720p, the resolution I post most shorts at:
60 tokens
Wan 3
90 tokens
Kling 4
150 tokens
Seedance 2.5
At 1080p the same 30 seconds is 120 tokens on Wan 3, 150 on Kling 4 and 360 on Seedance 2.5. Seedance also costs 1.5 times its normal rate, rounded up, when it has to read video, which covers every extension and any run with reference clips.
Which one to pick by the job
Many drafts, tight budget: Wan 3. At 480p a 30 second draft is 30 tokens, so you can try five hooks for the price of one Seedance take at 720p.
Motion and camera work: Kling 4. Tracking shots, orbits, sports and action scenes are where Kuaishou focused this release, and 21:9 is there for a wide brand film.
Talking clips and dialogue: Seedance 2.5. Put spoken lines in double quotes and it lip syncs them, with sound made in the same pass.
Anything longer than 30 seconds: Seedance 2.5, because Extend continues a clip from its last frame. Its guide is in the Seedance 2.5 extend walkthrough linked below.
A consistent face or product across posts: Seedance 2.5 with reference images, or any of the three in Editing mode with your own first frame.
For a full walkthrough of the long form path, read how to extend Seedance 2.5 clips past 30 seconds. For talking clips built from a library face, the AI UGC clip guide covers influencers and templates.
How to test all three on one prompt
You do not need three tabs. The Postlaty generator lets you tick several models in the same run, so you get three takes of one idea side by side.
- 1
Open the AI tab and pick video, then Generation
The Generate card in the media area of a new post opens the same generator.
- 2
Tick Kling 4, Seedance 2.5 and Wan 3
The token total on the button adds up every model you selected, so you see the full price before you run it.
- 3
Set 9:16, 720p and 5 seconds
A 5 second test costs 10 tokens on Wan 3, 15 on Kling 4 and 25 on Seedance 2.5, so 50 tokens for all three. Judge the hook first, then spend on length.
- 4
Write one prompt with motion, camera and light
Describe the action in order, name one camera move and the lighting, and put any spoken line in double quotes. The same text works for all three.
- 5
Render the winner at full length
Keep the model that nailed the hook and run it again at 15 to 30 seconds. If you have a strong opening still, switch to Editing and use it as the first frame, with an optional last frame.
Schedule the winner to TikTok, Reels and Shorts
Open the finished clip in the AI tab gallery and click Select. Postlaty opens a new post with the clip attached, whichever model made it.
One file, three networks
Add your TikTok, Instagram and YouTube channels to the same post. Instagram publishes the video as a Reel and YouTube uploads it as a Short.
A caption per network
Switch to Different captions so each network gets a line that fits, instead of one paragraph pasted three times.
The AI label, set once
Turn on AI-generated content in the post settings and Postlaty sends the AI disclosure flag with the upload to TikTok, YouTube and Instagram.
One slot on the calendar
Pick the time once. Channels count toward your plan, 10 on Starter, 20 on Pro and 50 on Premium, in any mix of networks.
For safe zones and the one file checklist, see how to schedule one video to TikTok, Instagram and YouTube.
My weekly split between the three
Monday: write five hooks and draft them on Wan 3 at 480p. Cheap, fast, and enough to see which idea moves.
Tuesday: run the best two on Kling 4 and Seedance 2.5 at 720p for 5 seconds, same prompt, side by side.
Wednesday: render the winner at 20 to 30 seconds. Extend it on Seedance 2.5 only if the story needs more.
Thursday: schedule it to TikTok, Reels and Shorts with Different captions and the AI label on.
Friday: check which clip held watch time and note the model and prompt that made it.
Limitations to know
Extend runs on Seedance 2.5 only in Postlaty. Kling 4 and Wan 3 clips stop at 30 seconds per take.
Kling 4 keyframes and Omni Reference live in the Kling app. In Postlaty, Kling 4 and Wan 3 take a text prompt or a first and optional last frame.
Kling 4 runs at 720p or 1080p in Postlaty. Kling lists 4K as coming soon on its own site.
Starter includes 10 tokens a month, which is a 5 second Wan 3 clip at 720p. Regular 30 second work needs Pro, Premium or a token pack.
The 7-day free trial is for scheduling. Your plan tokens arrive with the first paid invoice.
If a generation fails, the reserved tokens go back to your balance.
The bottom line
Use Wan 3 to find the idea cheaply, Kling 4 when the shot needs real camera work, and Seedance 2.5 when the clip talks or has to run past 30 seconds. Test all three on one prompt at 5 seconds, render the winner at full length, and schedule it to TikTok, Reels and Shorts from one post. Check the plans and token packs on pricing, and see how each network works on the TikTok, Instagram and YouTube pages.
FAQ
Frequently Asked Questions
It depends on the clip. Kling 4 is built for camera moves and fast action and costs less per second in Postlaty. Seedance 2.5 is the stronger pick for talking clips with lip sync and for videos longer than 30 seconds, because it is the one you can extend.
In Postlaty, Wan 3. A 30 second take at 720p is 60 tokens on Wan 3, 90 on Kling 4 and 150 on Seedance 2.5. At 480p a 30 second Wan 3 draft is 30 tokens.
Yes. In Postlaty, Kling 4 takes 3 to 30 seconds and Wan 3 takes 2 to 30 seconds per generation. Seedance 2.5 takes 4 to 30 seconds.
Not today. Extend runs on Seedance 2.5 only. You can upload a Kling 4 or Wan 3 clip of 30 seconds or less into Extend, and Seedance 2.5 continues it from the last frame.
Yes. All three take 9:16 in Postlaty, which is the format TikTok, Reels and Shorts want. Kling 4 also offers 21:9 for wide shots.
Postlaty has a 7-day free trial for scheduling. The AI models run on tokens, and your plan tokens arrive with the first paid invoice.
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