Seedream 5.0 Flash

Use seedream-5-0-flash to create image output. This page contains the complete request needed for this model.

Model facts

Property	Value
Model ID	`seedream-5-0-flash`
Endpoint	`POST /api/v1/generation/create`
Output	Image
Modes	text-to-image, image-to-image
Pricing	View current pricing

Minimal request


curl -X POST https://api.api-stock.com/api/v1/generation/create \
  -H "Authorization: Bearer $API_STOCK_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "seedream-5-0-flash",
  "input": {
    "prompt": "A cinematic scene with soft natural light"
  }
}'

The create response contains a task ID:


{
  "code": 200,
  "data": {
    "taskId": "019ca881-9503-7270-a560-f00fc2b15785",
    "status": "not_started",
    "createdAt": "2026-08-22T12:00:00.000Z"
  }
}

Parameters

Parameters belong inside the top-level input object. Unknown fields are rejected.

Parameter	Type	Required	Default	Description
`prompt`	string	Yes	—	Text description for image generation or editing (up to 5000 characters) max 5000 chars
`urls`	string[]	No	—	Up to 10 reference image URLs for image-to-image mode
`size`	“1:1” \| “4:3” \| “3:4” \| “16:9” \| “9:16” \| “3:2” \| “2:3” \| “21:9”	No	`"1:1"`	Image aspect ratio
`resolution`	“1K” \| “1.5K” \| “2K”	No	`"1.5K"`	Image resolution
`outputFormat`	“jpeg” \| “png”	No	`"jpeg"`	Output image format

Modes

Minimal generation


{
  "model": "seedream-5-0-flash",
  "input": {
    "prompt": "A cinematic scene with soft natural light"
  }
}

With urls


{
  "model": "seedream-5-0-flash",
  "input": {
    "prompt": "A cinematic scene with soft natural light",
    "urls": [
      "https://example.com/input.jpg"
    ]
  }
}

Constraints

prompt: maximum 5000 characters.
size: allowed: 1:1, 4:3, 3:4, 16:9, 9:16, 3:2, 2:3, 21:9.
resolution: allowed: 1K, 1.5K, 2K.
outputFormat: allowed: jpeg, png.

Invalid types, unsupported enum values, out-of-range numbers, and missing required fields return HTTP 400 with error.code: "invalid_input". Correct the request rather than retrying it unchanged.

Result

Poll the task or provide a top-level webhook URL in the create request:


curl https://api.api-stock.com/api/v1/task/status/$TASK_ID \
  -H "Authorization: Bearer $API_STOCK_KEY"

A successful media task returns one or more files:


{
  "code": 200,
  "data": {
    "taskId": "019ca881-9503-7270-a560-f00fc2b15785",
    "status": "finished",
    "files": [
      {
        "fileUrl": "https://s3.api-stock.com/result.png",
        "fileType": "image"
      }
    ],
    "createdTime": "2026-08-22T12:00:00.000Z"
  }
}

See Tasks and webhooks for terminal statuses, retries and webhook delivery.