I do not think “which model is better?” is answerable from the H3 and Seedance 2.5 launch videos. The useful question is which one fails less expensively on the shot you need.

These models have different production envelopes:

Both generate sound. Both can be directed with several kinds of reference. The decision changes when the scene crosses 15 seconds.

A one-minute scene is not four equal 15-second clips

H3 tops out at 15 seconds. A 60-second sequence therefore needs at least four generations, and usually more because the edit needs handles. Seedance 2.5 can cover the same timeline in two 30-second generations.

That does not automatically make Seedance better. A failed second 28 can make a 30-second render expensive to rerun. H3 lets you isolate the bad shot and regenerate a smaller unit. Seedance removes joins; H3 reduces the blast radius of a failed take.

For dialogue, continuous blocking or a camera move that must survive past 15 seconds, I would test Seedance first. For product inserts, cutaways and social shots where the edit already changes every 5–12 seconds, H3's duration cap is barely a constraint.

The cost gap is large enough to change how you iterate

Current reAPI prices, checked 23 August 2026:

Resolution tiers are not identical, so this is a budgeting comparison rather than a controlled image-quality test. It says something practical anyway: at the common 15-second boundary, Seedance 2.5 costs about 3.6 times H3 around 720p.

That changes prompt strategy. With H3, ten 15-second 768p attempts cost about $11.10. Ten Seedance 720p attempts cost about $40.03. Seedance only needs to remove a few continuity failures or edit joins to earn some of that back, but it should not be the default model for every insert just because its maximum duration is larger.

How I would run a fair test

Do not give both models a vague cinematic prompt and vote on the prettiest output. Use three jobs:

1. a 10-second product or character shot with one image reference;
2. a 15-second dialogue shot with required sound cues;
3. a 25–30-second continuous action that H3 must split at a planned edit point.

Run at least five attempts per job. Score usable outputs, not individual frames. Record identity drift, missed spoken words, continuity at the join, audio defects and total spend. The model with the highest demo quality can still lose if its acceptance rate is poor on the actual scene.

There is also a deployment caveat. H3's weights are public, but its community license excludes the US, EU, UK and South Korea from the applicable territory unless separate authorization is obtained. Seedance 2.5 has no public weights, so it is an API/service decision rather than a local deployment option.

My working rule: use H3 for short 2K-capable shots and cheap iteration. Pay for Seedance when 16–30 seconds of continuity, selective editing or its much larger reference set removes real post-production work.

On reAPI, where both MiniMax H3 and Seedance 2.5 are available. The published model pages are linked so the prices can be checked independently.