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Main changes vs 2.0: max duration 15s → 30s; references 9 images + 3 videos + 3 audios → 30 images + 10 videos + 10 audios; audio-only reference supported; mov output added.
Note: resolution is 480p / 720p only (2.0’s 1080p / 4k are not available on 2.5).

Authentication

string
requis
Bearer token auth. Get a key from the API Key page.

Request parameters

string
requis
Fixed value: seedance-2.5
boolean
défaut:"false"
Indique s’il faut modérer le contenu avant d’envoyer la tâche vidéo.
  • true : vérifier les prompts et les images d’entrée avec omni-moderation-latest
  • false ou omis : ne pas envoyer de requête de modération, sans coût ni latence de modération supplémentaires (par défaut)
Contenu vérifié :
  • Texte : prompt, negative_prompt
  • Images : image_urls, image_with_roles[].url, first_frame_image, last_frame_image
  • Ressources privées image asset:// : résoudre puis vérifier leur URL publique d’origine
  • Images Base64 : les vérifier après conversion en URL publique
video_urls, audio_urls ainsi que les ressources privées vidéo/audio ne sont pas vérifiés, car le modèle de modération ne prend pas en charge la vidéo ni l’audio.ID de modèles pris en charge : seedance-2.0, seedance-2.0-fast, seedance-2.0-mini, seedance-2.0-face, seedance-2.0-fast-face, seedance-2-0 (ancien nom) et seedance-2.5.L’appel de modération lui-même n’est pas facturé à l’utilisateur qui envoie la requête vidéo.
  • Un contenu détecté renvoie immédiatement HTTP 400 (nsfw_content_detected). Aucune tâche ni task_id n’est créé et aucun quota de génération vidéo n’est débité
  • Si la modération est indisponible, expire ou renvoie une réponse incorrecte, le comportement est fail-open et la génération continue. Cette option ne constitue pas une garantie absolue de sécurité du contenu
  • Les entrées impossibles à résoudre en URL publique d’image sont ignorées ; les modèles non pris en charge ignorent silencieusement nsfw_check: true
Exemple :
Réponse en cas de détection :
string
requis
Prompt. Reference media with @图片1 / @视频1 / @音频1 (1-based index matching array order). English aliases in prompts may also be used depending on model behavior; keep indices aligned with arrays.Example: "Use @视频1 for first-person framing throughout, @音频1 as BGM, first frame is @图片1"
string
défaut:"720p"
Resolution — only:
  • 480p
  • 720p (default)
Values like 1080p / 2k / 4k return a sync 400.
string
défaut:"adaptive"
Aspect ratio (field name aspect_ratio is also accepted).Values: 16:9, 4:3, 1:1, 3:4, 9:16, 21:9, adaptive (default)
Edit, extend, and first/last-frame jobs have hard size constraints — see Task types and constraints.
integer
défaut:"5"
Duration in seconds:
  • 4 ~ 30
  • -1: model picks duration (pre-charge at the 30s cap; settle to actual length after completion)
If omitted: generate and bill 5 seconds.
boolean
défaut:"true"
Whether to generate audio (alias field name: audio).
  • true: with audio (default)
  • false: silent video
boolean
défaut:"false"
Add an “AI generated” watermark. Default false.
integer
Random seed. Different seeds usually yield different results for the same request; the same seed is similar but not guaranteed identical.
string
défaut:"mp4"
Output container:
  • mp4 (default)
  • mov: higher color precision — recommended for edit / extend workflows
array<string>
Reference image URLs, all treated as reference_image.Supports:
  • Public URL: https://example.com/pic.jpg
  • Private asset: asset://cm9xxxxxxxx
For first/last frames use image_with_roles.
  • Max 30 images
  • Prefer image_with_roles for first/last-frame roles
array<object>
Images with explicit roles.Example:
If video_urls / audio_urls are present, first_frame / last_frame are auto-converted to reference_image (multimodal reference job).
array<string>
Reference videos (reference_video).Input: video URL or asset ID (asset://...).See Reference video specs.
array<string>
Reference audio URLs (reference_audio). Public URLs or asset://....Max 10; total duration ≤ 30s (each clip 2~30s).
2.5 supports audio-only reference (no image/video required).
boolean
défaut:"false"
When true, the successful result also includes the last-frame image for chaining.
array<object>
Tool list for enhancements such as web search.Example:

Media limits

Reference video specs

  • Input: video URL or asset ID (asset://...)
  • Container: mp4, mov — codecs in the table below
  • Resolution: 480p, 720p
  • Duration: each clip [2, 30] s; up to 10 reference videos; total duration of all videos ≤ 30s
  • Per-video dimensions:
    • Aspect ratio (width/height): [0.4, 2.5]
    • Side length (px): [300, 6000]
    • Total pixels: [640×640=409600, 3326×2494=8295044], i.e. width × height must fall in [409600, 8295044]
  • Size: each video ≤ 200 MB
  • Frame rate (FPS): [24, 60]

Supported codecs

Task types and constraints

The service infers task type from references and prompt intent. The last three types hard-constrain size / duration; violations fail asynchronously after the job starts (e.g. InvalidParameter.TaskTypeConstraint):

Asset library

You can pass public URLs as references, or upload into the library first and use asset://. Prefer the library when:
  1. Real human faces must use the library — raw URLs are blocked by content moderation; only approved library assets can be used
  2. Assets are reused often — upload once, skip repeated moderation on later jobs, faster submits
  3. URLs are signed temporary links — the platform stores a durable copy on ingest so later use does not depend on the original URL staying alive
  4. Library assets are synced to all available channels so multi-channel routing can use them wherever the job lands
The library is shared with the 2.0 family; approved asset:// IDs work in both 2.0 and 2.5 generation requests. Full submit fields: also see Private avatar assets.

Upload assets

The response includes a local task id. Poll with Get task status (GET /v1/tasks/{id}). After approval, list assets to obtain the asset:// ID.

Media limits (validated at submit)

Violations return 400 immediately (which asset index and which rule), without starting moderation or consuming moderation quota: Error example:
For 30s video assets, submit with "model": "seedance-2.5" (2.0 cannot use assets longer than 15s).
If the platform cannot probe the media (e.g. network blip), it may pass through and leave the decision to moderation.

Use in generation requests

Reference approved assets with asset:// in image_urls / image_with_roles / video_urls / audio_urls:
Multi-channel: after ingest, assets sync to all available channels so any routed channel can use them. If a channel’s copy is missing, the platform may re-upload from the original URL as a fallback (if that URL is already expired, that channel is skipped and another takes over).

Management APIs (quick reference)

Asset APIs are free of charge (auth + rate limits only); they do not create billing records.

FAQ

Q: How long does moderation take?
Images usually seconds; video and real-person assets may take minutes. Poll the task id until a terminal status.
Q: Moderation failed with no clear reason?
Some failures omit a detailed reason (often a transient fetch failure). The platform already retries once; if it still fails, change the URL (ensure it is publicly downloadable) and resubmit.
Q: Same asset for both 2.0 and 2.5 — upload twice?
No. Upload once; asset:// works for both generations. Cross-channel / cross-model sync is handled by the platform.
Q: Can I pass a real-person face as a raw URL?
Real-person assets must go through the library first.

Billing

  • Billed by seconds × resolution tier.
  • With reference video input: billable seconds = total input video duration (≤30s) + output duration, at the input-reference rate tier.
  • duration = -1 (auto): pre-charge at the 30s cap; settle to actual output after completion.
  • Omit duration: generate and bill 5 seconds.
  • Failed jobs or content moderation blocks: full refund (charge only on successful output).

Request examples

Text-to-video (30s)

Multimodal reference (image + video + audio)

Video edit

First–last frame

Private asset

Common errors

Response (submit)

integer
Status code; 200 on success
array
Submit response with status / task_id

Completed task (GET /v1/tasks/{task_id})

After submit, poll with Get task status. When status is completed, the payload looks like this.

Completed response example

Completed fields

Notes

  • Failed tasks (status=failed): cost is always 0 (pre-charge fully refunded); reason in data.error.message
  • usage may be missing for a few seconds after completion (settlement lag); query again shortly

Differences from 2.0