What does ByteDance officially say Seedance 2.5 adds (duration, extension, reference/editing, production controls)?

ByteDance Seed's Seedance 2.5 page (captured 2026-10-23): an audio-video joint generation model for "30-second storytelling"; up to 30 s per generation with the option to extend twice; better understanding of reference videos (intention, framing, cinematic language beyond motion transfer); more reliable audio and visual editing; "white-model control" (i.e., untextured/gray-model layout driving, matching creator use of clay playblasts) and green-screen editing, plus professional camera movement and performance blocking. The page gives no reference-count limits or resolutions; the 50-asset (30 image/10 video/10 audio) limit quoted by creators/hosts (C3-B334-04, C3-B335-04) is not on this page, and secondary hosts disagree on max resolution (480p/720p vs 1080p). Curator qualifications: All documentation excerpts located on the live pages by curator GET 2026-10-23; video metadata (title/date/length) checked where cited. 'White-model control' glossed as untextured/gray-model layout driving is discovery interpretation. No resolution or reference-count limits on the official page. Limitations: Resolution/reference limits must come from BytePlus ModelArk API docs (not retrieved: JS page). Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://seed.bytedance.com/en/seedance2_5",
      "note": "para \"Longer Narratives\"; para \"Aiming for Professional Production\""
    }
  ]
}