Models/ByteDance/Seedream 4.5

ByteDance: Seedream 4.5

Name: Seedream 4.5
Brand: ByteDance
Price: 0.040008 USD
Availability: InStock

Imageseedream-4.5

ByteDance Seedream 4.5: improved quality and editing.

API docs

Playgroundseedream-4.5

Reference image＋Upload

Aspect ratio

Quality

Latency8.1 s

24hnow

Specifications

Authorbytedance

ModalityImage

Price$0.040 / image$0.047 / image

Savings−15%

Quick start

from openai import OpenAI

client = OpenAI(
    base_url="https://api.altrouter.ai/v1",
    api_key="ar-...",
)

img = client.images.generate(
    model="seedream-4.5",
    prompt="a red fox in the snow",
)
print(img.data[0].url)

Same OpenAI-compatible endpoint — just swap base_url and key.

API

OpenAI-compatible image generation endpoint. The result is re-hosted on our CDN and returned as a URL.

POST/v1/images/generations

Body parameters

modelstringrequired"seedream-4.5"

The model id.

promptstringrequired

The text description of the image.

imagestringURL or base64

Reference images for editing.

aspect_ratioenum1:1 · 4:3 · 3:4 · 16:9 · 9:16 · 2:3 · 3:2 · 21:9default 1:1

Output aspect ratio.

qualityenumbasic · highdefault basic

Quality: basic (2K) / high (4K), affects price.

Response

createdinteger

Unix creation time (seconds).

dataarray

Images. Each: url (our CDN), b64_json, revised_prompt.

Example

cURLPythonJSON

curl https://api.altrouter.ai/v1/images/generations \
  -H "Authorization: Bearer ar-..." \
  -H "Content-Type: application/json" \
  -d '{
  "model": "seedream-4.5",
  "prompt": "a red fox in the snow",
  "aspect_ratio": "1:1",
  "quality": "basic"
}'

Errors

400Invalid request.

401Missing or invalid API key.

402Insufficient credits, or the key’s spending cap is exhausted.

404Model not found.

429Rate limit exceeded.