Prompting Seedance 2.5 vs 2.0: what actually changed

We moved our Content creator builder from Seedance 2.0 to 2.5 this fall. The headline is not “better looking video”. It is that 2.5 does what you ask more often, which is what you want when you are making ads at volume.

Four prompt habits changed for us.

1. Use timestamps, in whole seconds

2.0 ignores timestamps and only follows shot numbers. 2.5 follows integer-second ranges. Keep them continuous, with no gaps, and size each range to what happens in it:

0s-3s: She holds the bottle up to the camera and says the first line.
3s-7s: She turns the label toward the lens and explains what changed.
7s-12s: Close on her face as she gives the last line.

Too little in a range and the model improvises. Too much and it cuts or drops lines. We split each script by its words, so every second has something to do. That alone fixed the dead air before the first word.

2. Bind every asset by upload order

Say what each reference is and what to take from it: “the woman in Image 1, her face, outfit and room”. Never rely on the image to explain itself, and never put names inside the picture. That causes duplicated or swapped characters. 2.5 also accepts multi-view images of one subject, which 2.0 handled badly.

3. Describe what is there, not what is not

Write positive descriptions. Negatives only work for subtitles and audio, so the only “no” lines left in our prompts are “No subtitles” and “No BGM”.

4. Edits start with a trigger word

For edits, lead with “Editing task:” and describe the change from A to B: “Replace the woman in Video 1 with the woman in Image 1.” Our Recast tool does exactly this on every run.

Two smaller things

• 2.0 has six fixed aspect ratios. 2.5 takes anything from 0.4 to 2.5, set by your input assets.
• Don’t ask the model to pick the length. We tried it on a reference task and got 15 seconds with about 6 of silence. Work out the duration yourself.

2.5 rewards a prompt written like a shot list: a one-line summary, the plot by the second, and what stays constant.