Seedance generates audio and video together, takes images, clips and audio as references, and can edit and extend its own output. It is behind most of the recent RealityDrift finals. It also has two current models whose prompt rules contradict each other on timing, on sound notation and on negatives, and a paste written for one degrades silently on the other. Learn them as two dialects of one engine, built from the same master playbook in your prompt file and never from each other.
The official name of the flagship is plain "Dreamina Seedance 2.0". Resellers call it "2.0 Pro"; it is the same model, and its 720p list price is $0.15 per second.