Comparison · Video models
Seedance 2.0 vs Seedance 2.0 Fast
Seedance 2.0 or Fast? Same references and 4-15 s clips with audio, but Fast stops at 720p and costs about 27% less. Differences, prices and my tests.
Specs side by side
| Seedance 2.0 | Seedance 2.0 Fast | |
|---|---|---|
| Vendor | ByteDance | ByteDance |
| Type | Video | Video |
| Modes | text-to-video image-to-video first-last-frame reference-to-video | text-to-video image-to-video first-last-frame reference-to-video |
| Released | 2026-02 | 2026-02 |
| Duration | 4-15 s or auto (-1) | 4-15 s |
| Resolutions | 480p, 720p, 1080p, 4K | 480p, 720p |
| Aspect ratios | 16:9, 9:16, 1:1, 4:3, 3:4, 21:9, adaptive | 16:9, 9:16, 1:1, 4:3, 3:4, 21:9, adaptive |
| Reference images | up to 9 | up to 9 |
| Reference videos | up to 3 | up to 3 |
| Frames | first and last frame | first and last frame |
| Audio | native audio, on/off switch | native audio, on/off switch |
| Prompt length | up to 20,000 chars | up to 20,000 chars |
Price per unit and per clip
| Model | Variant | Rate | 5 s clip | 10 s clip |
|---|---|---|---|---|
| Seedance 2.0 | 480p | $0.157 / s | $0.784 | $1.57 |
| 720p | $0.338 / s | $1.69 | $3.38 | |
| 1080p | $0.842 / s | $4.21 | $8.41 | |
| 4K | $1.72 / s | $8.58 | $17.16 | |
| Seedance 2.0 Fast | 480p | $0.116 / s | $0.58 | $1.16 |
| 720p | $0.247 / s | $1.23 | $2.47 |
Prices exclude taxes and are charged from your prepaid USD balance. Failed generations cost nothing.
Seedance 2.0 Fast is the cheaper variant of ByteDance's Seedance 2.0 with exactly the same inputs: text, images, first and last frame, reference clips and audio tracks. There is one difference that matters: Fast stops at 720p. If 720p is enough for your reel, Fast gives you the same feature set for about 27% less. For 1080p and 4K you need the full model.
Key differences
- Resolution. Seedance 2.0 offers 480p, 720p, 1080p and 4K. Seedance 2.0 Fast offers only 480p and 720p.
- Price. At 480p and 720p the full model costs about 1.35-1.37 times as much as Fast.
- Default aspect ratio. The full model defaults to
adaptive(ratio taken from the image), Fast to 16:9. For vertical reels in Fast, setaspect_ratio: "9:16"explicitly. - Shared. 4-15 s clips,
duration: -1(the model picks the length), audio on by default, up to 9 images, 3 clips and 3 audio tracks, 7 aspect ratios including 21:9, prompts up to 20,000 characters.
When to pick Seedance 2.0
- A 1080p or 4K shot for a YouTube ad or for reframing later.
- The final render after the prompt has proven itself in Fast.
- Music video shots that will be cut together for a large screen.
- Image-to-video where the ratio should follow the image (the
adaptivedefault).
When to pick Seedance 2.0 Fast
- Instagram and TikTok reels where 720p is plenty.
- Prompt drafts at 480p before you pay for a higher resolution.
- A series of short product clips from the same references.
- B-roll and backgrounds for vlogs.
Cost in practice
At the same resolution Fast is about 26-27% cheaper. The big step is above it: full Seedance 2.0 at 1080p costs about 3.4 times as much per second as Fast at 720p, and 4K costs about twice the 1080p rate. In both models the seconds of reference clips in video_urls are added to the bill, while reference images and audio are not. With duration: -1 the hold is placed for 15 s and settled to the delivered length. Rates: from $0.157 per second and from $0.116 per second (both at 720p); every tier is on /pricing.
In my own tests (published in Polish on promptowy.com, run on another provider) both models got the same coffee-pour prompt. Seedance 2.0 Fast scored 8.0/10 in my first ranking, with a clear camera push-in but a rainbow lens flare and music I had not asked for. Full Seedance 2.0 scored 8.5/10 on it, the best of all models in the second ranking. Fast was not clearly faster for me (106-164 s versus 143-146 s), so I read the name as a tier label, not a speed promise. More on the newer generation: Seedance 2.0 vs 2.5.
FAQ
Seedance 2.0 or Fast: which is better for reels?
For 720p reels, Fast: same features, lower price. Pick the full model when you need 1080p or 4K.
Does Seedance 2.0 Fast do 1080p?
No, the maximum is 720p. For 1080p and 4K use Seedance 2.0 or Seedance 2.0 Eco.
Does Fast generate audio?
Yes. Like the full model it generates speech, effects and music, on by default. Turn it off with generate_audio: false.
Will a prompt from Fast work in the full model?
Yes, both accept the same fields. Just set the aspect ratio explicitly, since the defaults differ and the framing could change.
Vendor examples
Seedance 2.0
Seedance 2.0 Fast
Official examples from the model vendors, not our generations.