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 →
• Higgsfield surface: 480p/720p only, duration 4–30s, no start/end-frame role, no genre hint, extension_mode required for (and only for) video_extension →
• video_edit ignores duration and aspect_ratio and bills by the source video's length; video_extension inherits the source's aspect ratio →
• Every reference material gets an explicit role and an exclusion — "what to use" plus "what not to use"; never let the model infer the mapping →
• Each material also declares a fidelity grade — full-preserve / partial-preserve / attribute-transfer (name the target) / loose-guide; beat lines name characters (name + one visible marker), never handles →
• Material budget: 30 images / 10 videos ≤30s total / 10 audio ≤30s total, 50 materials max; stability ranges are 1–8 subjects (images), 1–5 subjects at 5–10s (video/audio) →
• Multi-reference is a 5-step workflow — map → group → profile → select-by-scene, one line per subject; @Images 1 through 4 define four characters is the canonical failure →
• Long videos are staged, not paragraphed: one primary change per stage + an explicit end state; timestamps allocate a budget, they are not frame-accurate edit points →
• Staging fixes too many EVENTS; two incompatible JOBS in one generation (physics + performance) is a separate cut — split into two prompts and stitch →
• Bracket syntax: () music · <> SFX · {} dialogue · 【】 subtitles; non-Chinese dialogue needs a language line before the line →
• First/last frames and multi-keyframes are declared in the prompt (@Image 1 is the first frame) — aspect ratio locks to the first image; never merge the two anchors into one sentence →
• Editing needs a sole editing master + edit scope + Timeline Inheritance; extension needs the boundary frame aligned before any new content: MODE-PLAYBOOKS.md
• Storyboard grids, coarse-vs-fine blockouts, one-click video, seamless transitions: MODE-PLAYBOOKS.md
• AI-VFX production pipeline — model-per-asset-class routing, the size-ref frame, location batching, the omni_reference v2v lane (source ≥4s, duration = source), the four-batch rule, the slop catalog: VFX-PIPELINE.md
• Emotion needs 2–4 observable cues, not adjectives; niche camera terms get translated into a visible result →
• The real-person formula is 7 slots — and slot 1 is role, never age: the age-blind engine rule outranks the source guide's [Age/Race] label →
• Hard limits that must not be over-promised (frame accuracy, locked parameters, pixel-identical transitions) →
• Dreamina-product features that are not on the Higgsfield surface — Ultra Long Video 180s, mark-based editing, Clay Renderer →