Wan 2.7 vs Wan 3.0: clip length and resolution limits by model id

Wan 3.0 is the longer and cheaper-to-draft model: 2 to 30 seconds at 480P, 720P and 1080P. Wan 2.7 text-to-video and image-to-video stop at 15 seconds and start at 720P. On Sume only Wan 3.0 is in the video catalog (wan-3.0); I found no Wan 2.7 id there.

The two lines side by side

Alibaba's video generation model list shows the following for the Wan family.

What changes in practice

• A cheap draft: Wan 3.0 can render at 480P. Wan 2.7 text-to-video and image-to-video cannot go below 720P.
• A longer shot: Wan 3.0 reaches 30 seconds in one pass, double Wan 2.7's 15.
• Reference and edit work: Wan 2.7 has separate reference-to-video and video-edit ids, each capped at 10 seconds.

What Sume exposes

wan-3.0 accepts 2 to 30 seconds at 480p, 720p and 1080p, with audio, first and last frames, and image, video and audio references. Sume does not list wan2.7-videoedit; for editing a source clip, Sume's route is the video_url edit mode of Gemini Omni Flash 1.1, described in the Sume docs. If you need a Wan 2.7 id specifically, call Alibaba.

Picking a version for a project

A storyboard of 8 to 12 second shots works on either version, but the 720P floor of Wan 2.7 text-to-video means you cannot make cheap 480P proofs there. A single 25-second continuous shot works only on Wan 3.0. An edit job on an existing clip is the one place the older id has a named product on Alibaba's list, and the page I read lists no Wan 3.0 video-edit id.

If you are on Sume, the choice is already made for you: wan-3.0 is the Wan id, and its documented limits are the ones in this post. Read GET /v1/videos/models before sending a duration so you do not get a rejected request for a value outside 2 to 30.