Seedance 1.5 Pro

Overview

Seedance 1.5 Pro is a ByteDance video generation model for short text-to-video, image-to-video, and video extension workflows. Use this page when you are ready to call the API after trying the model in the APIXO playground.

Capability	Value
Model ID	`seedance-1-5-pro`
Modes	`text-to-video`, `image-to-video`, `video-extend`
Prompt length	3-2500 characters
Reference images	1-2 URLs for `image-to-video`; the second image is used as the end frame
Source video	Exactly 1 public video URL for `video-extend`
Aspect ratios	`auto`, `1:1`, `3:4`, `4:3`, `9:16`, `16:9`, `21:9` for `text-to-video` and `image-to-video`
Resolutions	`480p`, `720p`, `1080p`
Duration	4-12 seconds; use `4`, `8`, or `12` for predictable tier matching
Audio	Required `sound` toggle
Output	Generated or extended video URL in `resultJson.resultUrls`

Endpoint and authentication

Base URL:

https://api.apixo.ai/api/v1

Method	Endpoint	Purpose
`POST`	`/generateTask/seedance-1-5-pro`	Submit a generation task
`GET`	`/statusTask/seedance-1-5-pro?taskId={taskId}`	Poll task status and retrieve results

All requests require your APIXO API key:

Authorization: Bearer YOUR_API_KEY

Submit requests also require:

Content-Type: application/json

Copy-paste async quickstart

This minimal request submits a text-to-video task and returns a taskId.

curl -X POST "https://api.apixo.ai/api/v1/generateTask/seedance-1-5-pro" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "async",
    "input": {
      "mode": "text-to-video",
      "prompt": "a calm seaside sunrise with gentle camera dolly movement",
      "resolution": "720p",
      "duration": 8,
      "sound": false,
      "aspect_ratio": "auto",
      "camera_fixed": false,
      "seed": 123456,
      "watermark": false
    }
  }'

Successful response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678"
  }
}

Save the taskId; you need it to poll for the final result.

Poll for result

curl -X GET "https://api.apixo.ai/api/v1/statusTask/seedance-1-5-pro?taskId=task_12345678" \
  -H "Authorization: Bearer YOUR_API_KEY"

Processing response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "processing",
    "createTime": 1767965610929
  }
}

Success response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "success",
    "resultJson": "{\"resultUrls\":[\"https://file.apixo.ai/xxx.mp4\"]}",
    "createTime": 1767965610929,
    "completeTime": 1767965695412,
    "costTime": 84483
  }
}

Failed response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "failed",
    "failCode": "SensitiveContent",
    "failMsg": "Content violates upstream policy, please adjust the prompt",
    "createTime": 1767965610929,
    "completeTime": 1767965620132,
    "costTime": 9203
  }
}

Parse resultJson after state becomes success:

const payload = JSON.parse(data.resultJson);
const videoUrls = payload.resultUrls;

Request body

Text-to-video

{
  "request_type": "async",
  "input": {
    "mode": "text-to-video",
    "prompt": "a clean product showcase on a neutral background, subtle lighting shifts, steady camera",
    "resolution": "720p",
    "duration": 8,
    "sound": false,
    "aspect_ratio": "auto",
    "camera_fixed": true,
    "seed": 123456,
    "watermark": false
  }
}

Image-to-video

{
  "request_type": "async",
  "input": {
    "mode": "image-to-video",
    "prompt": "animate this landscape with moving clouds and soft wind",
    "image_urls": [
      "https://example.com/start-frame.jpg",
      "https://example.com/end-frame.jpg"
    ],
    "resolution": "480p",
    "duration": 4,
    "sound": true,
    "aspect_ratio": "1:1",
    "camera_fixed": false,
    "seed": 123456,
    "watermark": false
  }
}

Video extend

{
  "request_type": "async",
  "input": {
    "mode": "video-extend",
    "prompt": "continue the same shot with a gentle smile and then a smooth ride-away",
    "video_urls": [
      "https://example.com/source.mp4"
    ],
    "resolution": "720p",
    "duration": 8,
    "sound": true,
    "camera_fixed": true,
    "seed": 123456,
    "watermark": false
  }
}

Parameters

request_type

string

default:"async"

required

Result delivery mode. Use async for polling with statusTask, or callback for webhook delivery.

callback_url

string

Required when request_type is callback. Must be a public HTTPS URL that can receive the final task payload. See Webhooks.

input

object

required

Seedance 1.5 Pro input parameters.

Show properties

mode

string

Generation mode. Supported values: text-to-video, image-to-video, video-extend. If omitted, APIXO infers image-to-video when image_urls is present and text-to-video otherwise. Set video-extend explicitly when extending a source video.

prompt

string

required

Text prompt describing the desired video or continuation. Supports 3-2500 characters after trimming.

image_urls

string[]

Reference image URLs. Required for image-to-video. Supports 1-2 URLs; when two are provided, the first is the start frame and the second is the end frame.

video_urls

string[]

Source video URLs. Required for video-extend; provide exactly 1 public video URL. Do not use video_urls for text-to-video or image-to-video.

resolution

string

required

Output video resolution. Supported values: 480p, 720p, 1080p.

duration

integer

required

Video duration in seconds. Accepts integer values from 4 to 12; numeric strings are also accepted by the backend. Use 4, 8, or 12 for predictable tier matching.

sound

boolean

required

Whether to generate audio with the video. Use true for generated sound, or false for a silent video.

aspect_ratio

string

default:"1:1"

Output aspect ratio for text-to-video and image-to-video. Supported values: auto, 1:1, 3:4, 4:3, 9:16, 16:9, 21:9.

camera_fixed

boolean

Set true to request a stable camera view. For video-extend, the backend defaults this field to true when omitted.

seed

integer

Optional random seed for more reproducible results across retries and repeated runs.

watermark

boolean

Whether to keep the upstream watermark in the generated video when the selected route supports it.

Legacy fixed_lens is still accepted for compatibility, but new integrations should use camera_fixed.

Response format

Submit task response

POST /generateTask/seedance-1-5-pro returns a task ID when the task is accepted:

code

integer

API status code. 200 means the task was accepted.

message

string

Human-readable status message.

data.taskId

string

Unique task identifier used with the status endpoint.

Status response fields

taskId

string

Unique task identifier.

state

string

Current task state: pending, processing, success, or failed.

resultJson

string

JSON string containing the generated or extended video URLs. Present when state is success.

failCode

string

Machine-readable failure code. Present when state is failed.

failMsg

string

Human-readable failure message. Present when state is failed.

createTime

integer

Task creation timestamp in Unix milliseconds.

completeTime

integer

Task completion timestamp in Unix milliseconds. Present after completion.

costTime

integer

Processing duration in milliseconds. Present after completion when available.

Webhook callback mode

Use callback mode when your backend should receive the final result automatically instead of polling.

curl -X POST "https://api.apixo.ai/api/v1/generateTask/seedance-1-5-pro" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "callback",
    "callback_url": "https://your-server.com/webhooks/apixo",
    "input": {
      "mode": "video-extend",
      "prompt": "continue the same scene with a smooth smile, then leave the frame naturally",
      "video_urls": [
        "https://example.com/source.mp4"
      ],
      "resolution": "720p",
      "duration": 8,
      "sound": true,
      "camera_fixed": true,
      "seed": 123456,
      "watermark": false
    }
  }'

The callback payload uses the same unified response shape as the status endpoint when the task reaches a final state. See Webhooks for delivery requirements and retry behavior.

Billing

Seedance 1.5 Pro is billed per second. The selected resolution, duration, and sound value determine the total cost for all supported modes, including video-extend.

Resolution	`sound`	Price
`480p`	`false`	`$0.012 / second`
`480p`	`true`	`$0.024 / second`
`720p`	`false`	`$0.024 / second`
`720p`	`true`	`$0.048 / second`
`1080p`	`false`	`$0.052 / second`
`1080p`	`true`	`$0.104 / second`

Total cost is the per-second price multiplied by the billable duration. For example, 720p with sound: false for 8 seconds costs $0.192. For current route and market comparison pricing, see Pricing.

Latency and polling

Actual latency may vary by prompt complexity, input media, mode, route selection, and current queue load. video-extend includes source clip analysis and final stitching, so it can take longer than direct text-to-video or image-to-video generation.

Mode	Duration	Typical generation time	Recommended first poll	Poll interval
`text-to-video`, `image-to-video`	`4` seconds	40s-60s	40s after task creation	5s-10s
`text-to-video`, `image-to-video`	`8` seconds	60s-90s	60s after task creation	5s-10s
`text-to-video`, `image-to-video`	`12` seconds	90s-120s	90s after task creation	5s-10s
`video-extend`	`4` seconds	45s-75s	45s after task creation	5s-10s
`video-extend`	`8` seconds	60s-110s	60s after task creation	5s-10s
`video-extend`	`12` seconds	90s-150s	90s after task creation	5s-10s

Video generation can take time. For production workloads, use callback mode to avoid frequent polling.

Rate limits and concurrency can vary by account, API key, and route. If you receive 429, slow down requests and retry with backoff. For account-level details, see System APIs.

Errors and troubleshooting

HTTP errors

Code	Meaning	What to do
`400`	Invalid request body, missing required field, unsupported mode, unsupported resolution, invalid duration, malformed source URL array, or rejected prompt/media	Fix the request before retrying
`401`	Missing or invalid API key	Check the `Authorization` header
`402`	Insufficient balance or quota	Add balance or switch account/key
`403`	Key or route cannot access the model	Check permissions and route strategy
`429`	Rate limit or concurrency limit reached	Retry with exponential backoff
`500`	Server error or unmapped upstream error	Retry with backoff; contact support if it repeats
`502`	Upstream error	Retry with backoff
`504`	Upstream timeout	Retry or use callback mode for long-running jobs

Task failure codes

Fail code	Meaning	What to do
`MISSING_REQUIRED_PARAM`	A required field such as `prompt`, `video_urls`, `resolution`, `duration`, or `sound` is missing	Fix the request before retrying
`INVALID_PARAMETER`	One or more fields use an unsupported value or type	Check `mode`, media URLs, `resolution`, `duration`, `sound`, `camera_fixed`, `seed`, and `watermark`
`API_SERVICE_UNAVAILABLE`	Video extension processing or generation is temporarily unavailable	Retry later
`PromptInvalid`	The prompt was rejected or malformed	Rewrite the prompt and retry
`SensitiveContent`	The prompt or generated content violated upstream policy	Change the prompt or reference media
`ImageFormatIncorrect`	A reference image could not be accepted	Use a public JPG, PNG, or WebP image URL
`RateLimited`	The upstream route rate limited the task	Retry later with backoff
`Timeout`	The workflow did not finish in time	Retry, simplify the prompt, or use callback mode
`InsufficientBalance`	The route could not continue because of balance or quota	Add balance before retrying
`Unknown error`	The failure did not match a known public mapping	Retry or contact support with the `taskId`

Common validation fixes

Symptom	Fix
`mode` is rejected	Use `text-to-video`, `image-to-video`, or `video-extend`
`image_urls` is missing for image-to-video	Provide 1-2 public image URLs
`video_urls` is missing for video-extend	Set `input.mode` to `video-extend` and provide exactly 1 public video URL
`resolution` is rejected	Use `480p`, `720p`, or `1080p`
`duration` is rejected	Send an integer from `4` to `12`
`sound` is rejected	Send a boolean: `true` or `false`
Prompt length error	Keep the trimmed prompt within 3-2500 characters

See Error Codes for the full error reference.

​Overview

​Endpoint and authentication

​Copy-paste async quickstart

​Poll for result

​Request body

​Text-to-video

​Image-to-video

​Video extend

​Parameters

​Response format

​Submit task response

​Status response fields

​Webhook callback mode

​Billing

​Latency and polling

​Errors and troubleshooting

​HTTP errors

​Task failure codes

​Common validation fixes

​Related links

Overview

Endpoint and authentication

Copy-paste async quickstart

Poll for result

Request body

Text-to-video

Image-to-video

Video extend

Parameters

Response format

Submit task response

Status response fields

Webhook callback mode

Billing

Latency and polling

Errors and troubleshooting

HTTP errors

Task failure codes

Common validation fixes

Related links