Seedance 2.5 for one long take with your product in it

What 2.5 does that 2.0 and 2.0 Fast do not

Seedance 2.0 and 2.0 Fast stop at 5 or 10 seconds and accept a prompt or a single start image. Seedance 2.5 adds three things. Length: any whole number of seconds from 4 to 30, so a hook, a demo and a closing frame can share one camera move and one light setup instead of being stitched from three clips. Reference mode: up to 40 reference files combined into one scene. And speech: a line written in quotation marks is spoken with lip movement, which our tested UGC prompts relied on.

If your ad is one five-second move on a packshot, none of that matters and 2.0 Fast is the better buy. If it needs a person to say something, or a single take longer than ten seconds, 2.5 is the only Seedance version that can do it.

How the per-second price adds up

Seedance 2.5 is billed per second of video, and 720p costs more per second than 480p. The From figure in the table is a 5-second clip at 480p, the setting the generator opens with. A 30-second take at 480p therefore costs roughly six times that figure, and 720p raises it again. The generator shows the exact price before anything runs.

That shapes how you work. Settle the motion at 480p and five to eight seconds, where a bad take is cheap. Only when the choreography is right should you extend the length and switch to 720p for the file you publish. All our published Seedance 2.5 tests were run at 480p, and that was enough to judge motion, lip sync and whether the product held.

Writing a 20-second take as beats

A long Seedance prompt reads best as timed beats. Say you sell an insulated bottle and want a 20-second trail ad. Upload the product photo and a trail photo for reference mode and write: “Image 1 is the product: a sage green insulated bottle with a bamboo lid and no printed text or logo anywhere on it. Image 2 is the location. 0 to 4 seconds: a woman in her thirties stops on the trail and unscrews the lid. 4 to 14 seconds: she drinks, ice clinks, she screws the lid back on. 14 to 20 seconds: the bottle alone on a rock, centred.”

Two details in that prompt come from things that went wrong in our tests. “No printed text or logo” is there because reference mode printed an invented brand name on a plain bottle until we said it, twice. And the person is described in words rather than uploaded as a photo, because Seedance’s input filter refused one of our photoreal start frames as possibly showing a real person, even though she was AI-generated.

Spoken lines and timing

For a talking ad, put the delivery first and the line in quotes after it (“she says, deadpan:”), then one action, so the mouth is free while the product is shown. In our 8-second clips, lines of 13 to 17 words took 3.5 to 6.5 seconds to say, which left time for the demonstration. A three-sentence line came back word for word with natural pauses; an earlier take of a longer line got its first word wrong.

The generated voices were clear enough for testing hooks. Accents and voice types can only be described, not selected, so for a campaign you may still record or license a voiceover and keep the visuals. Do not present an AI presenter as a real customer.

Plan for the wait as well. Our 8-second clips took 4 to 12 minutes each, the slowest renders in our tests, so write several scripts and queue them together.