Seedance 2.5 API: Seed blog says soon, BytePlus says live

Is the Seedance 2.5 API available? The two ByteDance pages I read today do not agree. The Seed announcement says API access is "coming soon via BytePlus ModelArk", while the BytePlus Seedance product page carries the headline "Dreamina-seedance-2.5 API Now Fully Available to Clients". If you need a call that works from your own code today, Sume's video router lists seedance-2.5.

What each page says

The Seed announcement describes up to 30 seconds per generation with multi-round extension, and references of up to 30 images, 10 video clips and 10 audio clips per pass. It says the model is rolling out on Jimeng AI and Doubao Pro. It lists no resolution tiers and no prices.

The BytePlus product page showed only its headline when I loaded it; the body, its pricing page and its docs pages did not render for me. So I cannot tell you a BytePlus price, region list or rate limit, and this post does not quote any.

What runs on Sume

Sume's video models docs list seedance-2.5 with 4 to 30 second clips, 480p, 720p and 1080p, native audio, and image, video and audio references. Aspect ratios are 21:9, 16:9, 4:3, 1:1, 3:4 and 9:16. Sume bills the list price times 1.25, rounded up to cents.

Older seedance-2, seedance-2-fast and seedance-2-mini stay routable by explicit id.

A practical rule

When two vendor pages conflict, treat the more conservative one as true until you can make a request. List the model ids your account can see through GET /v1/videos/models and plan around that response, not a headline. The video router docs describe the shape of that list.

Checks before you commit

Because the vendor pages disagree, write down what you need before you choose an access path. Most teams care about four things: whether the model id is callable with a key you already hold, which regions can use it, what the per-token price is, and what the rate limit is. None of those four can be confirmed from the Seed announcement, and I could not read them on the BytePlus page either.

Sume's table above is the opposite situation. Its docs list the id, the duration range, the resolutions and the reference types, so you can write the request today. Pricing is stated as a rate per thousand video tokens in Sume's pricing tables, and the billed amount is list times 1.25 rounded up to cents.