Seedance 2.5 Flash and Seedance 2.5 are the same family: Flash is the quick edition, Seedance 2.5 the full one. Here is what you give up for speed, what you keep, and when each one is the right choice.
The short answer: use Flash to find the shot, quickly and cheaply, then make the keeper with Seedance 2.5, especially if you need 1080p. That is exactly how ByteDance's own Dreamina app, where Flash launched first, positions them: it calls Flash faster and cheaper, and lets you switch between the two for each project.
Side by side
| Seedance 2.5 Flash | Seedance 2.5 | |
|---|---|---|
| What it is for | Fast takes, testing ideas, high volume | The most polished result |
| Resolutions | 480p, 720p | 480p, 720p, 1080p native (2K and 4K by upscaling on Lumeta) |
| Sound | Synchronized audio | Synchronized audio, dialogue and music |
| Clip length | Up to 30 seconds | 4 to 30 seconds |
| References | Up to 10 images, 5 videos and 5 audio clips | Up to 30 images, 10 videos and 10 audio clips |
| Edit videos | Yes | Yes |
| 5 s at 720p, median wait | About 2:00 (estimate) | 4:26 measured |
| Price per million tokens, API list | $7.00 | $10.70 (up to 720p) |
| 5 s at 720p, API list price | $0.76 | $1.17 |
| 5 s at 720p, on Lumeta | About $0.49 (estimate) | $0.73 |
| Default in Dreamina | No, you pick it | Yes |
Blue cells are our estimates or things ByteDance hasn't announced yet. Measured times are medians of real runs on Lumeta; see the speed page for how we measure.
Quality: how close is Flash to Seedance 2.5?
ByteDance promises Flash results "close to" the original Seedance 2.5, on both its Dreamina page and BytePlus's model page, and Dreamina says plainly that Flash cannot fully replace it. In practice, faster editions of a video model usually keep the look, the camera work and the sound, and give up a little on fine detail, complex motion and busy, many-character scenes. That is our expectation for Flash too. On launch day we'll run the same prompts on both and post the clips side by side here, so you can judge for yourself.
Speed: how much faster is Flash?
Seedance 2.5 is quick at 480p (a 5-second clip in a median 1 minute 40 seconds on Lumeta) but slow at 720p (4 minutes 26 seconds) and 1080p (about 9 minutes). Flash tops out at 720p, which tells you where it is aimed: the 720p wait. BytePlus says Flash generates video twice as fast as Seedance 2.5, which by our estimate means about 2 minutes for a 5-second 720p clip. We'll time it on launch day. All run times.
Price: how much cheaper is Flash?
About 34% cheaper, at both 480p and 720p, which is also BytePlus's own figure. BytePlus lists Flash at $7.00 per million tokens against $10.70 for Seedance 2.5 (with a video input, $4.30 against $6.40). A 5-second 720p clip with sound comes to about $0.76 on Flash at list price, against $1.17 on Seedance 2.5. Lumeta hasn't priced Flash yet; our estimate is about $0.49 for that clip, against $0.73 for Seedance 2.5 today. Full pricing.
The cheapest place to run Seedance 2.5 is Lumeta: $0.73 for that same 5-second 720p clip, less than on Higgsfield, Runway, Krea, OpenArt, Magnific, Artlist, Dreamina, fal, Replicate and WaveSpeed. Details at lumeta.ai/pricing#seedance.
Which should you use?
Pick Seedance 2.5 Flash when
- You are exploring: trying prompts, angles, timing or styles.
- You need many variations of one scene, fast.
- 720p is enough, like social clips, drafts, storyboards and previews.
Pick Seedance 2.5 when
- It is the final version, and every detail counts.
- You need 1080p, or 2K and 4K by upscaling.
- The scene is busy, or needs more references than Flash takes (it stops at 10 images, 5 videos and 5 audio clips).
- You are editing an existing video and want the most polished result.
Can't wait for Flash? Draft with Seedance 2.5 at 480p: it is already fast, and on Lumeta you can re-make the exact same video at 1080p within 7 days, paying only what the 1080p run would have cost anyway.
Use Seedance 2.5 now, Flash on launch day
Both in one Lumeta account, at the lowest Seedance price we know of.
Flash vs 2.5 questions
What is the difference between Seedance 2.5 Flash and Seedance 2.5?
Flash is a faster, lighter edition of Seedance 2.5: twice as fast and about 34% cheaper, per BytePlus. It stops at 720p and takes fewer references (10 images, 5 videos and 5 audio clips, against 30, 10 and 10). Seedance 2.5 is slower but makes the most polished video and goes to 1080p natively. ByteDance says Flash's results are close to Seedance 2.5's but don't fully replace it.
Is Seedance 2.5 Flash worse than Seedance 2.5?
A little, by design: it trades some quality for speed. ByteDance describes Flash's output as close to the original Seedance 2.5. We'll post side-by-side clips on launch day.
Does Seedance 2.5 Flash support 1080p?
No. ByteDance's Dreamina page and BytePlus's API price list both show 480p and 720p only. For 1080p, use Seedance 2.5.
How much cheaper is Seedance 2.5 Flash than Seedance 2.5?
About 34% at BytePlus list prices: $7.00 per million tokens against $10.70. A 5-second 720p clip is about $0.76 on Flash and $1.17 on Seedance 2.5.
Do Seedance 2.5 prompts work on Flash?
We expect so, since Flash is built on Seedance 2.5. See the prompt guide.
Sources: Dreamina's Seedance 2.5 Flash page, BytePlus ModelArk's Flash model page, BytePlus ModelArk's price list, ByteDance's Seedance 2.5 announcement. Seedance 2.5 limits as offered on Lumeta. Run times measured on Lumeta; API prices are our arithmetic from BytePlus list prices. Estimates are ours.