{ "id": "task_01J9XA2B3C4D5E6F7G8H9J0K1L", "object": "task", "model": "video-fast/v1.0/reference-to-video", "task": "reference-to-video", "status": "queued", "input": { "prompt": "@Image1 walks along the beach at sunset, the camera follows, @Audio1 plays softly", "reference_images": [ "https://assets.example.com/inputs/character.png" ], "reference_audios": [ "https://assets.example.com/inputs/theme.mp3" ], "duration": 5, "resolution": "480p" }, "error": null, "credits": { "estimated": 14 }, "metadata": { "order_id": "ord_8813" }, "created_at": "2026-10-23T07:02:44.310Z"}
Video Fast 1.0
Video Fast 1.0 — reference to video
Generate a video that keeps the look of your reference images, the motion of your reference videos and the
sound of your reference audio, with Video Fast 1.0: 480p or 768p, 3–30 seconds, always with audio.
Send at least one asset. The prompt names the assets by their position: @Image1 is the first item of
reference_images, @Video1 the first item of reference_videos, @Audio1 the first item of
reference_audios. image_url is not accepted on this task type.
Asset
Count
Limits
reference_images
up to 9
JPG, PNG or WebP, 256–5,760 px, at most 30 MB each
reference_videos
up to 3
2–15 seconds and at most 50 MB each
reference_audios
up to 3
at most 15 MB each; send them together with an image or a video
Optional key that makes the request safe to retry: any string up to 128 characters, unique per account,
kept for 24 hours. The same key with the same body replays the first answer (Idempotent-Replayed: true)
instead of creating a second task. See Idempotency.
Maximum string length: 128
Example:
"order-8812-attempt-1"
Body
application/json
Send at least one of reference_images, reference_videos, reference_audios.
Fixed seed, 0 to 2147483647; omit it for a random seed (the seed used is not returned). A seed reproduces a result only together with the exact prompt the model saw: send prompt_expansion: none for reproducible runs - with basic or advanced the prompt is rewritten by a language model on every request, so the same seed gives a different video. Without expansion the quality depends entirely on your prompt: write a detailed, cinematic prompt yourself, or keep expansion on and accept that runs vary. Video Fast 1.0 reproduces the video exactly; Wan 3.0 Spark / Prime Spark make it reproducible, not guaranteed identical. Every model takes it.
When the output is removed, 7 days after completion.
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