Seedance 2.5

Seedance 2.5 is ByteDance's video generation model. It produces a single continuous take of 4 to 30 seconds with picture and sound generated together, and it can be steered with up to 50 image, video and audio references. On Plot Party you can run it in the browser generator or call it through the API and MCP with the model id seedance-2.5.

The clip limit doubles from 15 to 30 seconds in one pass, and the reference limit goes from 12 to 50, now including video and audio references. Seedance 2.5 adds two modes that 2.0 does not have: region editing, which changes one masked area of a source video and leaves the rest untouched, and a dedicated extend mode. Prompts can be twice as long, up to 10,000 characters. Seedance 2.0 remains available on Plot Party for 4:3 and 3:4 output and 4K.

Any length from 4 to 30 seconds, in 1-second steps, as one continuous shot rather than stitched clips. Output is 480p, 720p or native 1080p. In edit mode the output keeps the length of the source video you are editing.

Yes. Dialogue, footsteps, room tone and score are generated in the same pass as the frames, so there is nothing to sync afterwards. Write the lines in your prompt and the character speaks them, lip-synced, in the language you wrote. You can also give it up to 10 audio references, for example a voice or a music cue, alongside your images.

Up to 50 per generation: as many as 30 images, 10 videos and 10 audio files. Audio cannot be the only reference. Mention each one in the prompt as @Reference1, @Reference2 and so on, in the order you uploaded them, so the model knows which face, product, location or motion clip you mean.

Upload a clear reference photo of each character, product and location and name it in the prompt. The model holds every reference for the full length of the take, so the same face, wardrobe and set persist across the shot instead of drifting. For repeatable movement, add a short video of the action as a motion reference and the timing carries over to your character.

Pick 16:9 or 9:16 before you generate, or leave it on adaptive and the model composes for the frame of your references. Composition is planned for the chosen frame rather than cropped from a wider one.

Yes. Edit mode takes a source video of 4 to 30 seconds, a mask over the region to change and a description of the change; everything outside the mask stays identical frame for frame. Extend mode continues a source video with new footage of 4 to 30 seconds. Both accept extra image references for the new content.

You pay in Plot Points per second of video generated, so a 10-second clip costs twice a 5-second one. Resolution changes the rate: 1080p costs more per second than 720p, and 480p costs less. Edit mode is billed on the length of the source video. Current rates and plans are on the pricing page.

Yes. The Plot Party API and MCP server expose Seedance 2.5 as seedance-2.5 with the same modes as the generator: omni, first and last frame, extend and edit. Upload references first, then pass their URLs in reference_urls. The API docs list every parameter.

No. Prompts that mention well-known intellectual property are blocked before generation. Use your own characters, products and reference images instead.