Fan Edits Across Endpoints: Seedance 2.5 Locks the Character
Most fan edit guides pick one video model and stay there. A fan edit actually has two separate problems — establishing what the character looks like, then producing shot after shot that stays on model — and the two reference-to-video endpoints on Siray are built for different halves of that work.The split falls straight out of the request bodies.
Key Takeaways
- bytedance/seedance-2.5-ref2v accepts 30 reference images; alibaba/wan-3.0-ref2v accepts 10.
- Only Wan 3.0 exposes a seed. Seedance has no seed field at all, so a shot you like cannot be re-rolled.
- Only Seedance offers a 21:9 aspect ratio and a duration of -1, letting the model choose the length.
- Use Seedance to establish the look from a deep reference stack, then move to Wan 3.0 for shots you need to repeat.
The Two Endpoints Take Different Reference Loads
Both endpoints require the same five fields — model, prompt, duration, size, aspect_ratio — and both top out at 1080p. The difference is what you are allowed to hand them.
Field | seedance-2.5-ref2v | wan-3.0-ref2v |
images limit | 30 | 10 |
videos limit | 10 | 5 |
audios limit | 10 | 5 |
seed | absent | present |
duration | -1 or 4-30 s | 2-30 s |
aspect_ratio | 7 values, includes 21:9 | 6 values |
Character identity in a fan edit is carried by coverage — the face from several angles, the costume in different light, the silhouette in motion. Ten slots force you to choose; thirty do not.
Only One of Them Can Repeat a Shot
This is the single field that decides your pipeline order. Wan 3.0 ref2v takes a seed integer. Seedance 2.5 ref2v does not expose one.
Without a seed, every call is a fresh draw. You can get a shot that is perfect and then never get it again — you have no handle to ask for the same draw twice. Wan 3.0 also carries prompt_expansion_enable, defaulting to true, which rewrites your prompt before generation. Turn it off when you are matching an established look, or the expansion will quietly drift the description shot over shot.
For a fan edit, that maps cleanly: exploration tolerates randomness, continuity does not.
A Two-Stage Fan Edit Pipeline
- Establish. Send your full reference stack — up to 30 images — to Seedance 2.5 ref2v. Let duration sit at -1 and let the model settle the pacing. You want one clip that gets the character right.
- Extract. Pull the frames that define the look. That is now your canonical reference set, and it is small enough to fit Wan 3.0's ten-image limit.
- Repeat. Move to Wan 3.0 ref2v with prompt_expansion_enable off and a fixed seed. Vary only the prompt. Same seed, same reference set, different action.
The general craft of keeping a character consistent is covered in our Seedance 2.5 consistency guide, and the narrative side of combining both models appears in our short films walkthrough.
What This Costs
Wan 3.0 ref2v is on a per-run table and currently discounted 25% for Launch Week: two seconds runs $0.12 to $0.09 at 480p, $0.24 to $0.18 at 720p, and $0.48 to $0.36 at 1080p. Billable duration is your input video length, capped at five seconds, plus the output length. Full specs are in our Wan 3.0 breakdown.
Seedance 2.5 ref2v bills differently — a token formula driven by output dimensions and the combined input and output duration, rather than a fixed per-second rate. Budget it per job. Our micro-drama cost breakdown works the gap through on real clips.
A note on material: keep fan edits to public-domain or adult characters, and check the rights on anything you feed in. Siray is committed to responsible AI use.
FAQ
Can I use the same reference images for both endpoints?
Yes, but Wan 3.0 caps images at 10 while Seedance 2.5 accepts 30, so you will need to select a subset when you move to Wan.
Why does my Seedance shot look different every time?
Seedance 2.5 ref2v has no seed field, so each call is an independent draw. Use Wan 3.0 ref2v when you need a shot to be reproducible.
Which endpoint should I use for a widescreen fan edit?
Seedance 2.5 ref2v is the only one of the two with a 21:9 aspect ratio value. Wan 3.0 ref2v offers six ratios, none of them 21:9.
Build Your Fan Edit Pipeline on Siray
Both endpoints run on one API key. Register for Siray and call Seedance 2.5 and Wan 3.0 from the same integration — no second account, no second billing relationship.