Comparison · Video
Seedance 2.0 vs Seedance 2.0 Fast
Seedance 2.0 vs Seedance 2.0 Fast: identical inputs and sound, yet Fast is capped at 720p and priced about 27% lower. When 1080p and 4K pay off.
What each one accepts
| 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 | built in, can be turned off | built in, can be turned off |
| Prompt length | up to 20,000 chars | up to 20,000 chars |
Rates and clip costs
| 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 | $0.124 / s | $0.622 | $1.24 |
| 720p | $0.265 / s | $1.32 | $2.65 |
Charged from a prepaid USD balance, no taxes added. A failed generation is $0.
Fast is the lower-cost version of ByteDance's Seedance 2.0, and it accepts everything the full model does, from prompts and photos to frame pairs, reference video and audio. The one real limit is resolution, since Fast tops out at 720p. If your reel lives at 720p, Fast gives you everything for roughly 27% less. For 1080p or 4K, you need the full model.
When to pick Seedance 2.0
- YouTube ads at 1080p or 4K, or footage you plan to reframe.
- The final render once a prompt has proved itself in Fast.
- Music video footage destined for a large screen.
- Image-to-video where the frame should follow the photo's ratio, via the
adaptivedefault.
When to pick Seedance 2.0 Fast
- Vertical social posts for TikTok or Instagram, which rarely need more than 720p.
- 480p drafts before paying for more resolution.
- A product series built on one shared set of references.
- Vlog B-roll and backgrounds.
Differences you will notice
- Price. At equal resolution Seedance 2.0 Fast is about 26-27% cheaper than Seedance 2.0. Rates at 720p: from $0.157 per second and from $0.124 per second. At 1080p the full model runs about 3.4x the Fast 720p rate, and 4K roughly doubles 1080p.
- Resolution. Full model: 480p, 720p, 1080p, 4K. Fast: 480p and 720p.
- Default framing. The full model starts from
adaptive, Fast from 16:9. Shooting vertical in Fast? Passaspect_ratio: "9:16". - Speed. Fast was not clearly quicker in my runs: 106-164 s against 143-146 s. So read "Fast" as a price tier, not a promise.
- Shared. 4-15 s,
duration: -1, sound on by default, references (9 images, 3 clips, 3 audio files), 7 ratios including 21:9, 20,000-character prompts. Clip seconds invideo_urlsare billed; images and audio are not.
How to decide
Pick by output size. Up to 720p: Fast. Above 720p: the full model, or Seedance 2.0 Eco for 1080p and 4K. A common pattern is to iterate in Fast and switch for the final render. With duration: -1 funds are held for 15 s and settled at the length you get. All tiers on /pricing; the next generation is covered in Seedance 2.0 vs 2.5.
Questions
How did the two score on the same prompt?
On my coffee-pour prompt Fast got 8.0/10 in the first ranking, thanks to a clean push toward the cup, though it added a rainbow flare and music nobody asked for. The full model got 8.5/10, the best result of any model in the second ranking.
Will my framing change when I move a prompt from Fast to the full model?
It can, because the default ratios differ. Set aspect_ratio explicitly in both and the shot stays consistent.
Can I switch the sound off in Fast?
Yes, with generate_audio: false. The price stays the same.
Samples from the makers
Seedance 2.0
Seedance 2.0 Fast
These clips and images come from the vendors, not from my runs.