higgsfield-seedance-2-5

# Higgsfield Seedance 2.5 Director Seedance 2.5 is a **different dialect from Seedance 2.0**, not a version bump you can prompt through by habit. 2.0 is a reference-driven shot generator with start/end frames and a 4K lane. 2.5 is an **omni-reference production model**: up to 50 reference materials, 30-second native runtime, and three non-generation modes — it can edit a video you already have, and extend one forward or backward from its boundary frame. The prompt grammar changes with it. Reference roles are declared in prose (`@Image 1 defines …`), audio and text get bracket syntax, long videos are staged with explicit end states, and first/last frames are announced **inside the prompt** rather than selected as a mode. > **Model split — read this before writing anything.** 2.5 caps at **720p** and has no > `start_image` / `end_image` media role, no `genre` hint, and no 4K lane. If the job > needs 4K, a genre hint, or platform-level start/end frame pinning, it is a > **Seedance 2.0** job — `../higgsfield-seedance/SKILL.md`. See § Choosing 2.0 vs 2.5. ## QUICK FACTS *Generated-checked block (scripts/build_index.py verifies anchors). Routing aids — read the linked sections for the rules themselves.* - Four modes, picked **before** writing: `t2v` · `omni_reference` · `video_edit` · `video_extension`; the mode changes what the prompt *is* [→](#the-mode-router) - Higgsfield surface: **480p/720p only**, duration **4–30s**, no start/end-frame role, no genre hint, `extension_mode...