Seedance 2.0 Fast on Genosai — fast 720p video with audio
Seedance 2.0 Fast is the fast video model of ByteDance's Seedance 2.0 line, available on Genosai. It generates clips at 480p and 720p with audio, up to 15 seconds long, and accepts up to 9 images, 3 videos and 3 audio files as references. On Genosai the model runs online, with no API setup — generation costs from 15.5 credits per second.
Updated: July 7, 2026
- Balance of speed and quality — Seedance 2.0 Fast is the middle tier of the line: faster and cheaper than the flagship, but higher quality than Seedance 2 Mini.
- Up to 720p resolution — The model generates at 480p and 720p; 1080p stays exclusive to the flagship Seedance 2.0 for final quality.
- Audio with video — Native audio generation: dialogue, effects and music are created with the picture, with sound on by default.
- First and last frame — Set a start frame and, optionally, an end frame — the model builds the motion between them in one clip.
- Multimodal references — Up to 9 images, 3 videos and 3 audio files per generation — for character, style and camera-motion transfer.
Contents
- What is Seedance 2.0 Fast
- Capabilities
- Examples
- How to use on Genosai
- Prompts
- Generation cost
- Comparison
- Limitations and tips
- FAQ
What is Seedance 2.0 Fast
Seedance 2.0 Fast is ByteDance's fast video model from the Seedance 2.0 line, released in 2026. In the family it takes the place of the middle tier: faster and cheaper than the flagship Seedance 2.0, but higher quality and more stable than the most affordable Seedance 2 Mini. It is a sensible compromise for anyone who needs both decent quality and adequate speed.
Fast is built on the same 2.0 architecture and inherits its key capabilities. First is native audio: the model creates sound together with the picture — lines, effects and music — in one generation, with sound on by default. Second is multimodal references: in a single generation the model accepts up to 9 images, 3 videos and 3 audio files and refers to them in the prompt, holding a character, style and camera motion.
The main difference from the flagship is resolution. Fast is capped at 480p and 720p, while 1080p stays exclusive to Seedance 2.0. For speed and price the model gives up maximum resolution and some raw detail, but keeps audio, references and frame control. So Fast is the working version for most short clips where 720p is enough.
On Genosai the model runs online: you do not need a developer account, API keys or your own infrastructure. You open the video studio in the browser, describe the scene, optionally upload frames and references, and get a clip with sound. Seedance 2.0 Fast suits ad inserts, short scenes with dialogue, social content and any task where a balance of quality, speed and price matters.
Capabilities
Seedance 2.0 Fast gives the full cycle of a short clip with sound at a reasonable speed. Here is what the model does in practice.
Speed and quality
Fast is the middle tier of the line: noticeably faster and cheaper than the flagship, but with a cleaner picture and steadier handling of complex scenes than Mini. That makes it a handy default version: you get quality close to the flagship at 720p while paying and waiting less. For volume tasks it is often the optimal choice within the 2.0 line.
Resolution and duration
The model generates at 480p and 720p at 24 frames per second; 1080p is not available in this tier. Clip length is 4 to 15 seconds, with a smart-duration mode that picks the length by the meaning of the prompt. Different aspect ratios — 16:9, 9:16, 1:1, 4:3, 3:4 and 21:9 — let you assemble a clip straight for YouTube, Reels, Shorts or a wide frame.
Audio with video
Fast inherits the native audio of the 2.0 line: the audio track is generated at the same time as the image and is on by default. It is dialogue, sound effects and music, with lip movement synced in several languages. A short talking scene can be produced whole in one generation, with no separate voiceover.
First and last frame
Seedance 2.0 Fast supports start- and end-frame control. You upload a start image and, if needed, an end one — the model builds motion between them. This is handy for controlled transitions, logo animation, a product turnaround and storyboards where the start and end of a scene matter.
References and modes
In a single generation the model accepts up to 9 images, 3 videos and 3 audio files. Images hold a character and style, audio sets a voice or music, and a reference video lets it replicate camera motion and how objects move. The model works as both text-to-video and image-to-video, and can also edit and extend a finished clip.
Examples
There is no demo gallery for Seedance 2.0 Fast on Genosai yet, so instead of ready clips we describe the typical scenarios the model is built for. The first scenario is text-to-video: you describe the scene in words, and the model generates video with sound, including lines and effects, at a reasonable render speed.
The second scenario is image-to-video: you animate an uploaded frame by giving it motion and sound, to make a short clip from a product or character photo. The third scenario is first and last frame: you fix the start and end of a scene, and the model builds a smooth transition between them. The fourth scenario is working with references: up to 9 images, 3 videos and 3 audio files hold the character, style and camera motion so a series of clips looks unified. In all cases the model generates picture and sound together, at 480p or 720p.
How to use on Genosai
Launching Seedance 2.0 Fast on Genosai requires no setup: everything happens in the browser and the model is already connected. The basic path from an idea to a finished clip looks like this.
- Sign in to your Genosai account and open the video studio.
- Pick Seedance 2.0 Fast in the model list.
- Describe the scene: action, camera motion, light and sound if you need it.
- If needed, upload a first and last frame and references — up to 9 images, 3 videos and 3 audio files.
- Set the resolution up to 720p, the duration and the aspect ratio, then run the generation.
- Download the clip or refine the prompt and regenerate.
Prompts
These templates show how to phrase tasks for Seedance 2.0 Fast. Replace the text in square brackets with your own data and add details on motion, light and sound — the model takes them into account when generating.
Text-to-video: [scene and action], smooth camera move, natural light, background music, 720p, 10 seconds.Image-to-video: animate the uploaded frame [description], soft object and camera motion, keep the composition, 720p.First and last frame: transition from [start frame] to [end frame], smooth interpolation, no cuts.Dialogue scene: [character] delivers the line [text], lip sync, lively expression, quiet ambient in the background.Product ad: [product] on [background], slow turnaround, studio light, highlights, a soft sound effect.Reference video: replicate the camera move from [reference] but with a new scene [description], same rhythm.Vertical 9:16 clip for social: [story], dynamic frame, energetic music, 12 seconds.Generation cost
On Genosai the cost of Seedance 2.0 Fast is counted per second of the clip and depends on resolution: about 15.5 credits per second at 480p and 33 credits at 720p. So a ten-second clip at 720p costs about 330 credits, and at 480p noticeably less. Fast is pricier than the lightest Mini but cheaper than a 720p render on the flagship version, staying a balance of quality and price.
You pay for actual generations, with no monthly subscription, so the spend is easy to plan for a task. Starter credits after sign-up let you try Seedance 2.0 Fast for free. Current packages and balance are in the Pricing section.
Comparison
Seedance 2.0 Fast is the choice when you need a balance of quality, speed and price at 720p with sound. If maximum quality and 1080p matter more, move up to the flagship Seedance 2.0; if the lowest price matters more, take Seedance 2 Mini. For pure image-to-video without audio there is the light Seedance Pro Fast, and among other families Kling 2.5 Turbo is close in class.
| Model | Strength | Price on Genosai |
|---|---|---|
| Seedance 2.0 Fast | Balance of speed and quality, audio | from 15.5 credits/sec |
| Seedance 2.0 | 1080p, maximum quality | from 9 credits/sec |
| Seedance 2 Mini | Lowest price in the 2.0 line | from 9.5 credits/sec |
| Seedance Pro Fast | Fast i2v without audio | from 18 credits |
| Kling 2.5 Turbo | Fast video with voice | 5=42, 10=84 credits |
All models are available in one Genosai interface, so you can compare them on your own scene and pick the best by price and quality. A practical approach is to keep Fast as the main working version and switch on the flagship only for final scenes at 1080p.
Limitations and tips
Seedance 2.0 Fast is the middle tier, so 1080p is not available here, and on the raw detail of complex scenes the flagship Seedance 2.0 gives a cleaner result. If you need maximum resolution, render the final on Seedance 2.0, and if the priority is the lowest cost for volume, switch to Seedance 2 Mini. Exact limits and parameters may depend on the studio — rely on the actual result.
Like any video model, Fast is sensitive to prompt detail. Describe the camera motion, light, action and sound: the more specific the input, the more predictable the clip. For talking scenes, state the line itself and keep it short to fit the duration. For controlled transitions use the first and last frame, and for a single series use shared references.
Work iteratively: get a short draft at 480p, check the composition and motion, then raise the resolution to 720p for the final. That way you save credits and reach the result faster, without overpaying for failed takes at more expensive settings.
FAQ
What is Seedance 2.0 Fast and who built it?
Seedance 2.0 Fast is ByteDance's fast video model from the Seedance 2.0 line, released in 2026. It is the middle tier of the generation between the flagship and the Mini version. On Genosai it is available online with no separate subscription and no API setup.
How much does a Seedance 2.0 Fast video cost on Genosai?
The price is counted per second of the clip: about 15.5 credits per second at 480p and 33 at 720p. You pay for actual generations, with no monthly subscription. Current packages are in the Pricing section.
How is Seedance 2.0 Fast different from Seedance 2.0 and 2 Mini?
Fast is a compromise: faster and cheaper than the flagship Seedance 2.0, but higher quality and more stable than the cheapest Seedance 2 Mini. Fast is capped at 720p, while 1080p is available only in the flagship of the line.
Does Seedance 2.0 Fast generate audio?
Yes. Like the whole 2.0 line, Fast creates audio together with the video — dialogue, sound effects and music — in one generation, with sound on by default. Speech is synced to lip movement in several languages.
What resolutions and durations does Seedance 2.0 Fast support?
The model generates at 480p and 720p at 24 frames per second; 1080p is not available in this tier. Clip length is 4 to 15 seconds, with a smart-duration mode that fits your prompt.
How many references does Seedance 2.0 Fast take?
Up to 9 images, 3 videos and 3 audio files per generation. Images hold a character and style, and a reference video lets it replicate camera motion and how objects move in frame.