Is 2.5 better than Seedance 2.0?

Not strictly — they trade. 2.5 reaches thirty seconds and thirty reference images; 2.0 reaches 4K and costs about a third less per second. Pick 2.5 for length and references, 2.0 for resolution and cheap drafting.

What resolutions are available?

Only 480p and 720p. There is no 1080p or 4K on this model — if you need those, render on Seedance 2.0.

How long can a single clip be?

Thirty seconds, in one take. The floor is four seconds, the same as 2.0.

Does audio cost extra?

No. Native audio is on by default and the price is identical either way, whether the clip is four seconds or thirty.

Seedance 2.5 video generator

Seedance 2.5 is ByteDance's long-form model. It renders up to thirty seconds in a single take — twice the ceiling of Seedance 2.0 — and accepts up to thirty reference images that you address directly in the prompt. The trade is resolution: it stops at 720p, and it costs more per second than 2.0. Native audio is included, on by default.

Made with this model

Every clip below was rendered here, on the settings shown under it. The caption is the exact prompt that produced it.

A neon-lit ramen counter at night: steam rises off a fresh bowl as the chef slides it across the wood, reflections shifting in the window behind. Slow lateral dolly, shallow depth of field, cool blues against warm lamp light.

Seedance 2.5 · 720p · 16:9 · 4s

The cat lifts its head, ears turning toward the window, then settles back into the sunbeam as the curtain stirs. Slow push-in, dust drifting through the light.

Seedance 2.5 · 720p · 16:9 · 4s

The mug from @Image1 and the paper crane from @Image2 share a wooden desk beside a window; steam curls off the mug while the crane trembles in the draft. Slow dolly right, warm afternoon light, shallow focus.

Seedance 2.5 · 720p · 16:9 · 4s

Running Seedance 2.5 here

Draft at 480p
About 103 credits for a five-second 16:9 clip, or 58 in square. Settle the prompt where a mistake is cheap, before you commit to a long take.
Load your references
Reference to video takes up to thirty images. Point at them in the prompt as @Image1, @Image2 and so on, and the model holds those subjects consistent through the shot.
Go long
Four to thirty seconds in a single render, with no cut. Thirty seconds at 720p 16:9 runs about 1,387 credits — cost scales with duration, so check the price before you submit.