Seedance V1.5 Fast Extend: AI video extension

Fast video extension using ByteDance Seedance V1.5.

$0.40 for a 5 second clip at 720p. Video is paid per clip from your wallet, no subscription. The studio shows the price before you pay, and top ups start at $5.

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Key features

Seedance V1.5 Fast Extend turns a video you already have into video inside Enhance AI. It produces clips from 5 to 10 seconds at 720p. Seedance V1.5 Fast Extend is built by ByteDance. On Enhance AI it runs on the same account as every other model, with no separate subscription.

Clip length

Seedance V1.5 Fast Extend renders clips from 5 to 10 seconds, and you pick the length before you render. Longer clips cost more because video is billed by length, so rough out an idea short and only render the full length once the shot works.

Resolution

Choose 720p or 1080p before you render. A lower resolution costs less, so test a prompt low and rerender the keeper at the top setting. The studio shows the price for the setting you picked before anything is charged.

Input modes

Upload a video you already have and Seedance V1.5 Fast Extend continues it from the last frame, so the new segment matches the light, the framing and the motion of the original. Describe what should happen next and the model carries the shot forward without a visible join.

Audio

Seedance V1.5 Fast Extend can generate sound with the picture, so the clip arrives with audio that matches what is on screen rather than silence you have to fill later. You can still mute it and lay your own voice or music track over the top in any editor.

Specifications

Provider: ByteDance
Price: $0.40 for a 5 second clip at 720p
Type: Video
Released: 16 December 2025
Resolution: 720p
Duration: 5, 10 seconds

How to use Seedance V1.5 Fast Extend on Enhance AI

1
Sign in and pick Seedance V1.5 Fast Extend
Press Try on this page to open the Video Studio with Seedance V1.5 Fast Extend selected. Video is paid per clip from your wallet, which starts empty, so top it up first.
2
Upload the clip and say what happens next
Upload the video you want to continue and describe the next beat in plain words, using the same terms as the original prompt so the extension stays consistent. Then pick a length from 5 to 10 seconds and a resolution.
3
Generate, then download
Press Generate. You see the price before you confirm, and the clip lands in your history, ready to download.

Common questions

What is Seedance V1.5 Fast Extend?: Seedance V1.5 Fast Extend is a video extension model from ByteDance. It turns a video you already have into video: 10 second clips at 1080p with native audio.
What do I need to upload to use Seedance V1.5 Fast Extend?: A video and a written prompt. Add them in the studio on Enhance AI, check the preview and render. The output lands in your history, ready to download or to pass to another model on the same account.
When was Seedance V1.5 Fast Extend released?: ByteDance released Seedance V1.5 Fast Extend on 16 December 2025. You can run it on Enhance AI now, along with every other video model on one account.
How long can a Seedance V1.5 Fast Extend clip be?: Seedance V1.5 Fast Extend produces clips from 5 to 10 seconds. Longer runs cost more, because video is billed by length rather than by generation.
What resolution does Seedance V1.5 Fast Extend output?: Seedance V1.5 Fast Extend renders at 720p or 1080p. You pick the resolution before you render, and a lower one costs less.
Does Seedance V1.5 Fast Extend generate audio?: Yes. Seedance V1.5 Fast Extend can generate sound with the picture, so the clip arrives with audio rather than silence. Mute it and lay your own track over the top if you prefer.
Is Seedance V1.5 Fast Extend free to try?: No. Video on Enhance AI is paid per clip from your wallet, and a new account starts with an empty wallet, so there are no free Seedance V1.5 Fast Extend clips. The free tokens you get on signup, with no card needed, pay for image and audio tools, not video. Wallet top ups start at $5.
What does it cost to run Seedance V1.5 Fast Extend?: It costs $0.40 for a 5 second clip at 720p. Seedance V1.5 Fast Extend renders are billed from your wallet by clip length and resolution, so a short clip at a lower resolution costs less than a long one at full quality. You see the price for your settings before you render.