Seedance 2.5 is the first video model I use where one prompt can carry a whole short story. A single take runs up to 30 seconds with sound, and when 30 seconds is not enough you extend it from the last frame instead of starting over. That changes how you plan short video: fewer disconnected 5 second shots, more clips that actually go somewhere.
This guide shows the full path inside Postlaty: generate a Seedance 2.5 clip, extend it past 30 seconds, check what each second costs in tokens, and schedule the result to TikTok, Instagram Reels and YouTube Shorts from one post.
What Seedance 2.5 changed
ByteDance's Seed team launched Seedance 2.5 on 31 July 2026. According to the official launch post and product page, three things matter for social video:
Up to 30 seconds in one pass
Seedance 2.0 topped out at 15 seconds per generation. Seedance 2.5 doubles that, with audio and video generated together, so one take can hold a setup, a turn and a payoff.
Extension rounds
You can append new shots to an existing output while the model keeps the same characters, scene and pacing. That is how a 30 second clip becomes a longer video.
More references
ByteDance lists up to 30 images, 10 video clips and 10 audio clips as references in a single request, up from 9 images and 3 clips or audio files on 2.0.
For a founder posting short video, the practical win is continuity. A product demo, a skit or a talking clip no longer has to be cut from five unrelated generations that each look slightly different.
How to generate a Seedance 2.5 clip in Postlaty
Open the AI tab, or the Generate card in the media area of a new post. Both open the same generator.
- 1
Pick video, Generation, then Seedance 2.5
You can tick more than one model in the same run if you want to compare Seedance 2.5 with Seedance 2.0, Kling or Veo on the same prompt before you commit to one.
- 2
Set ratio, resolution and length
Vertical 9:16 is the default, which is what TikTok, Reels and Shorts want. Choose 480p, 720p or 1080p, and a length from 4 to 30 seconds.
- 3
Write the prompt as beats
Name the camera move, the light, the mood and the actual action. For a 20 or 30 second take, describe the sequence in order. Put spoken lines in double quotes so the model lip syncs them.
- 4
Add references if you have them
Upload stills, clips or audio as references for the face, the product, the motion or the voice. In Postlaty a Seedance 2.5 run takes up to 9 images, 10 clips and 10 audio files.
If you already have the opening frame, switch to Editing instead. Your still becomes the first frame, and an optional second still becomes the last frame, so the clip moves from one to the other. The orientation follows your still. For talking clips built from a library face, the AI UGC clip guide covers influencers and templates in more detail.
How to extend a clip past 30 seconds
Extend is its own mode next to Generation and Editing, and it runs on Seedance 2.5 only. The fastest way in is the gallery: hover a finished video and click Extend with AI. Postlaty loads that clip, switches to Extend and selects Seedance 2.5 for you.
- 1
Start from a clip of 30 seconds or less
The source clip can be one you generated or one you upload. Anything longer than 30 seconds is refused before you spend tokens.
- 2
Set the length of the new part only
Duration is the new segment, from 4 to 30 seconds, not the full film. The ratio follows the source clip, so a 9:16 take stays 9:16.
- 3
Prompt what happens next
Write from the last frame: the next action, the camera, and any new quoted line. Keep the same subject and setting words you used before.
- 4
Stitch, then repeat on the newest part
Each run returns only the new footage. Download the parts, join them in your editor, and extend the latest part again when you need more.
A 30 second first take plus two 30 second extensions gives you a 90 second video. That is a comfortable length for TikTok and fits inside the 3 minute limit YouTube gives Shorts.
What a Seedance 2.5 clip costs in tokens
Seedance 2.5 is priced per second of output, by resolution:
2 / sec
480p
5 / sec
720p
12 / sec
1080p
When the model has to read video, which is every extension and any generation with reference clips, the rate is 1.5 times higher, rounded up. A 720p extension is 8 tokens per second.
A 10 second 720p take is 50 tokens. A 30 second 720p take is 150.
A 30 second 720p extension is 240 tokens, so a 90 second 720p video is about 630.
Plans include 10, 50 or 100 tokens a month (Starter, Pro, Premium), and token packs sit next to the plan when you need more.
If a generation fails, the reserved tokens go back to your balance.
My rule: find the hook at 480p, where a 30 second draft is 60 tokens, then spend 720p or 1080p only on the take you will actually post. If you would rather hand the prompting and the calendar to agents, the AI agents marketing team for $49 a month shows that setup.
Post it 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. If you stitched several parts in an editor, upload the final file in the composer instead.
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 TikTok, Instagram and YouTube each get 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. Postlaty sends the AI disclosure flag with the upload to TikTok, YouTube and Instagram.
One time on the calendar
Pick the slot once. Each channel counts 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. If your audience is in the US and you are not, the playbook for growing US TikTok accounts from abroad is where these clips go next.
A simple weekly routine for longer AI clips
Monday: write three story ideas as beats, each with one clear hook in the first 3 seconds.
Tuesday: draft each idea at 480p in 9:16, keep the best one, render it again at 720p.
Wednesday: extend the winner once or twice, then stitch and export one file.
Thursday: schedule it to TikTok, Reels and Shorts with Different captions and the AI label on.
Friday: note which version held watch time, and reuse its references next week.
Limitations to know
Postlaty does not stitch extensions for you. Each run returns the new part, and you join the parts in an editor.
The clip you extend must be 30 seconds or less, so you extend the newest part, not the whole stitched video.
Starter includes 10 tokens a month, which is 5 seconds at 480p. Longer Seedance 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.
Continuity is strong but not guaranteed. Watch every part at phone size before you post.
The bottom line
Seedance 2.5 makes longer AI video practical: 30 seconds per take, extensions that keep the same scene, and sound in the same pass. In Postlaty you generate the take, extend it from the gallery, and schedule the final file to TikTok, Reels and Shorts from one post, with a caption per network and the AI label set once. Check the plans on pricing, and see how each network works on the TikTok, Instagram and YouTube pages.
FAQ
Frequently Asked Questions
ByteDance rolled Seedance 2.5 out in its own apps, Jimeng AI and Doubao, so check the current offer there. In Postlaty, Seedance 2.5 runs on tokens. The 7-day free trial covers scheduling, and your plan tokens arrive with the first paid invoice.
One generation is 4 to 30 seconds. For a longer video you extend it: each extension adds a new segment of 4 to 30 seconds that continues from the last frame, and you stitch the parts together.
No. In Postlaty each Extend run returns only the new footage. Download the parts, join them in an editor, and extend the newest part again if you need more.
It is 2 tokens per second at 480p, 5 at 720p and 12 at 1080p. Extensions and runs with reference clips cost 1.5 times that, rounded up, so a 720p extension is 8 tokens per second.
Yes. Attach the clip to one post, add your TikTok, Instagram and YouTube channels, write a caption per network and pick a time. Instagram publishes it as a Reel and YouTube as a Short.
Turn on AI-generated content in the post settings and Postlaty sends the AI disclosure flag with the upload to TikTok, YouTube and Instagram.
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