Does Wan 3.0 do 4K? Claim check against vendor pages and Sume

No. Wan 3.0 outputs 480p, 720p and 1080p, and nothing in the sources checked says otherwise. Alibaba's launch post lists those three tiers with a price for each. Morphic's model page says outright that there is no 4K output and that "Wan 3.0 does 4K" claims in search results do not come from Alibaba. Sume's validation agrees: on the Video Router, a request for 4k is rejected unless the model is minimax-h3 or gemini-omni-flash-1.1.

Why the claim circulates

Morphic also calls out invented spec tables, such as a parameter count and an open-weights licence, and says no weights have appeared for Wan 3.0 and that Alibaba's open line stops at Wan 2.2. If a page lists a 4K tier for Wan 3.0 without a vendor link, treat the page as unreliable for the other numbers too.

If you need more than 1080p on Sume

Sume's video docs say gemini-omni-flash-1.1 accepts 3 to 10 seconds at 360p, 720p, 1080p and 4K in 16:9 or 9:16. The same docs say minimax-h3 bills 2K and 4K upscales when a request includes them. Neither is a 30-second model, so a 4K film at that length means stitching clips from a short-clip model.

For a 30-second master at the highest tier Wan 3.0 offers, 1080p is $7.50 on Sume (30 x $0.20 x 1.25). Seedance 2.5 also stops at 1080p.

The cost of testing the claim yourself

You do not need to pay to learn this. GET /v1/videos/models returns supported_resolutions for each model, so the first check is a catalog call rather than a render. If you submit a 4k request to wan-3.0 on the Video Router anyway, request validation refuses it. The cheapest real test of the resolution tiers is the same 2-second prompt at each: 2 x $0.0625 = $0.125 at 480p (billed as $0.13), $0.25 at 720p and $0.50 at 1080p.

Seedance 2.5 sits in the same position. Its catalog entry lists 480p, 720p and 1080p and the 4-to-30-second range, and the pricing table assigns a higher per-token rate to the 1080p tier than to the two lower tiers, so there is no hidden fourth tier to price.

What to do with a 4K deliverable

• Check whether the buyer needs 4K pixels or a 4K container. A 1080p render in a 4K timeline is a different file from a native 4K render.
• Draft at 480p ($1.88 for 30 s) and finish at 1080p ($7.50) before deciding that 4K matters.
• Read supported_resolutions from GET /v1/videos/models for the model you pick instead of copying a number from a blog post, this one included.