POST/api/v1/imagine3 creditsSynchronous

Seedream 4.5

Provider · ByteDanceType · T2IModel ID · seedream-4.5Upstream ID · doubao-seedream-4-5-251128

Seedream 4.5 by ByteDance. Incremental update to 4.0 with noticeably improved face rendering, in-image text quality, and edit consistency for follow-up generations.

Request Parameters

Parameter	Type	Required	Description
prompt	`string`	Required	The text prompt describing the image to generate.
model	`string`	Optional	Set to `seedream-4.5` to use this model.Default: `seedream-4.5`
aspect_ratio	`string`	Optional	Output aspect ratio. Allowed: 1:1 · 16:9 · 9:16 · 4:3 · 3:4 · 3:2 · 2:3.Default: `1:1`
webhook_url	`string`	Optional	URL where we POST the completed task result.
webhook_secret	`string`	Optional	Sent as x-webhook-secret header in webhook delivery for verification.

Example Request

cURL

curl -X POST https://api.journeyapi.com/api/v1/imagine \
  -H "Authorization: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "seedream-4.5",
    "prompt": "professional headshot of a woman in her 30s, natural lighting, neutral background",
    "aspect_ratio": "3:4"
  }'

Response

This model is synchronous — the response includes the finished image_url directly. No polling required.

200 OK

{
  "task_id": "550e8400-e29b-41d4-a716-446655440000",
  "status": "finished",
  "image_url": "https://cdn.example.com/output.png"
}

Tips

1Better than 4.0 for prompts requiring legible text in the image.
2Improved face fidelity — prefer this over 4.0 for portrait work.