Seedance 2.5
seedance-2.5/reference-to-video
Try seedance-2.5/reference-to-video
Input
Output
Pricing
seedance-2.5/reference-to-video per second
| Specifications | Unit Price |
|---|---|
| 480P | $0.1215 |
| 720P | $0.2715 |
| 1080P | $0.680 |
Introduction coming soon
A detailed guide for this model is being prepared. Pricing, parameters and the API docs below are already available.
Create a generation task
https://api.hiapi.ai/v1/tasks Headers
AuthorizationstringRequiredAccount API key. Required on every request. Example: Bearer YOUR_HIAPI_API_KEY. Get your API key
Content-TypestringOptionalThe request body is always parsed as JSON; when sent, only application/json (optionally with charset) is accepted — any other value returns 415. Example: application/json.
Idempotency-KeystringOptionalIdempotency key, up to 255 bytes. Retries with the same key from the same account create the task only once; replays return the original taskId.
On network timeouts or client retries, the same key creates the task only once — no double charges (scope: the API key's account). Use a business-unique identifier as the key (e.g. "order-42"); replays return the original taskId, and keys expire 24 hours after the first request. See the Unified Async API overview for the full scenario matrix.
Body
modelstringRequiredCurrent fixed value: seedance-2.5/reference-to-video
routestringOptionalCurrent fixed value: default
inputobjectRequired
Business parameters for seedance-2.5/reference-to-video and route default — see the parameter table below.
promptstringRequiredInstructions for using the reference media. Address items in order as @image1, @video1, or @audio1. This model ID is for reference-guided generation, not video editing or extension.
durationintegerOptionalDefault: 5Output duration in seconds. Use -1 for automatic duration, or an integer from 4 to 30.
-145678910Show all (20)
1112131415161718192021222324252627282930resolutionstringOptionalDefault: "480p"Output resolution. Seedance 2.5 supports 480p, 720p, and 1080p.
480p720p1080pweb_searchbooleanOptionalDefault: falseAllow the model to search the web for current information mentioned in the prompt.
aspect_ratiostringOptionalDefault: "adaptive"Output aspect ratio. adaptive lets the model follow the reference material.
16:94:31:13:49:1621:9adaptiveoutput_formatstringOptionalDefault: "mp4"mp4 is the compatible default; mov targets professional post-production.
mp4movgenerate_audiobooleanOptionalDefault: trueGenerate synchronized dialogue, effects and background audio.
reference_audio_urlsarrayOptionalmaxItems 10Up to 10 reference audio clips. Each must be wav or mp3, under 15 MB, and 2-30 seconds. Combined audio duration must not exceed 30 seconds. Provide audio references together with at least one reference video.
Array [ string ]
reference_image_urlsarrayOptionalmaxItems 30Up to 30 reference images. Supported formats: jpeg, png, webp, bmp, tiff, and gif; under 30 MB each; 300-6000 px per side; aspect ratio 0.4-2.5. SVG, HEIC, and HEIF are not supported.
Array [ string ]
reference_video_urlsarrayRequiredminItems 1maxItems 10Up to 10 reference videos. Each must be mp4 or mov, contain at least 409600 total pixels (for example, 854x480 or higher), 24-60 fps, under 200 MB, 2-30 seconds, 300-6000 px per side, and aspect ratio 0.4-2.5. Combined video duration must not exceed 30 seconds.
Array [ string ]
callbackobjectOptional
Terminal-state notification config. When omitted, no callback is delivered — poll the task yourself. See the callback note below.
Provide callback.url when creating a task and HiAPI POSTs to your service once the task reaches a terminal state — no polling needed. The callback payload mirrors the task detail structure; signature verification, delivery retries and idempotency are documented on the Unified Async API overview page.
urlstringRequiredRequired when callback is present. A POST is sent to this URL once the task reaches a terminal state; must be a valid http(s) URL.
whenstringOptionalDefault: "final"Only final is supported today — notified on both success and fail.
finalstoragestringOptionalDefault: "temp"Artifact storage tier: temp (default, retained about 7 days) or persistent (long-term, billed by size). Insufficient balance or exceeding the storage cap silently downgrades to temp; the effective tier is shown in the task detail response.
temppersistentRequest examples
# Submit an async task; returns a taskId immediately (no waiting for generation)
curl -X POST "https://api.hiapi.ai/v1/tasks" \
-H "Authorization: Bearer $HIAPI_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "seedance-2.5/reference-to-video",
"input": {
"prompt": "…",
"duration": 5,
"resolution": "480p",
"web_search": false,
"aspect_ratio": "adaptive",
"output_format": "mp4",
"generate_audio": true,
"reference_video_urls": "…"
}
}'const res = await fetch("https://api.hiapi.ai/v1/tasks", {
method: "POST",
headers: {
Authorization: `Bearer ${process.env.HIAPI_API_KEY}`,
"Content-Type": "application/json",
},
body: JSON.stringify({
model: "seedance-2.5/reference-to-video",
input: {
"prompt": "…",
"duration": 5,
"resolution": "480p",
"web_search": false,
"aspect_ratio": "adaptive",
"output_format": "mp4",
"generate_audio": true,
"reference_video_urls": "…"
}
}),
});
const task = await res.json();
// { code: 200, message: "success", data: { taskId } }import os, requests
res = requests.post(
"https://api.hiapi.ai/v1/tasks",
headers={"Authorization": f"Bearer {os.environ['HIAPI_API_KEY']}"},
json={
"model": "seedance-2.5/reference-to-video",
"input": {
"prompt": "…",
"duration": 5,
"resolution": "480p",
"web_search": false,
"aspect_ratio": "adaptive",
"output_format": "mp4",
"generate_audio": true,
"reference_video_urls": "…"
}
},
)
print(res.json()) # { code, message, data: { taskId } }200 OK
{
"code": 200,
"message": "success",
"data": {
"taskId": "tk-hiapi-01HZTQ8BX2N3GM3YFK4Z9D7VQR"
}
}400 Bad Request
{
"code": 400,
"message": "invalid request",
"data": null,
"error_code": "INVALID_REQUEST"
}Get task detail
https://api.hiapi.ai/v1/tasks/:id Response fields
taskIdstringRequiredTask ID, always prefixed with tk-hiapi-.
modelstringRequiredResolved full model name. Tasks submitted with the route parameter return base@route (e.g. gpt-image-2/text-to-image@ext); otherwise identical to the name passed at creation.
routestringOptionalPresent only when the task was submitted with an explicit route parameter; echoes the submitted value.
statusstringRequiredTask status.
queued Queued, not started yet.
handling Being processed.
archiving Processing finished, artifacts being prepared.
success Terminal: completed, artifacts available (output returned).
fail Terminal: failed (error returned).
After submission, check status: success and fail are terminal, everything else is non-terminal. Poll every 1–3 seconds until terminal. On success, download artifacts from output[].url and transfer them before expireAt; pass storage: "persistent" at creation time when long-term retention is needed.
creatednumberRequiredTask creation time (Unix seconds).
completednumberRequiredUnix seconds when the task reached a terminal state; fixed to 0 while not terminal.
outputarrayOptional
Present only when status == success. Artifact list — always an array; a single task may return multiple types at once (e.g. video + first_frame).
Array [ object ]
Array items
urlstringRequiredArtifact URL, directly downloadable.
typestringRequiredCurrent possible values: video, image, audio, first_frame, last_frame, thumbnail; more may be added later.
expireAtnumberRequiredUnix seconds until which the artifact remains accessible; download or transfer before it expires.
errorobjectOptional
Present only when status == fail.
codestringRequiredBusiness error code.
messagestringRequiredError description.
Response examples
Success
{
"code": 200,
"message": "success",
"data": {
"taskId": "tk-hiapi-01HZTQ8BX2N3GM3YFK4Z9D7VQR",
"model": "happyhorse-1-0",
"status": "success",
"created": 1777282033,
"completed": 1777282099,
"output": [
{
"url": "https://cdn.hiapi.ai/tasks/.../video.mp4",
"type": "video",
"expireAt": 1777886899
}
]
}
}Processing (non-terminal)
{
"code": 200,
"message": "success",
"data": {
"taskId": "tk-hiapi-...",
"model": "happyhorse-1-0",
"status": "archiving",
"created": 1777282033,
"completed": 0
}
}Failed
{
"code": 200,
"message": "success",
"data": {
"taskId": "tk-hiapi-...",
"model": "happyhorse-1-0",
"status": "fail",
"created": 1777282033,
"completed": 1777282099,
"error": {
"code": "TASK_FAILED",
"message": "task failed"
}
}
}