Seedream 5.0 Pro

Seedream 5.0 Pro (bytedance-seed/seedream-5-0-pro) is the larger Seedream from ByteDance for image generation and editing: precise editing control, lifelike scenes and natural rendering — built for commercial visual production. Two endpoints: POST /v1/images/generations for text-to-image and POST /v1/images/edits for working from a reference image. The model is paid — generations are charged from your balance.

Parameters

Field	Description
`model`	`bytedance-seed/seedream-5-0-pro` (or the short `seedream-5-0-pro`)
`prompt`	What to draw, required
`n`	How many images, 1 to 4; each one is billed separately
`aspect_ratio`	`1:1`, `1:2`, `2:1`, `2:3`, `3:2`, `3:4`, `4:3`, `4:5`, `5:4`, `9:16`, `9:21`, `16:9`, `21:9`; defaults to `1:1`
`resolution`	`1k` or `2k`; defaults to `1k`
`size`	Explicit `WxH` — an alternative to the `aspect_ratio` + `resolution` pair
`quality`	The model has no such knob: passing the parameter returns `400`

The sizing rules differ per resolution: 1k keeps roughly a megapixel of area, while 2k pins the long side at 2048. Common combinations:

Aspect	1k	2k
`1:1`	`1000x1000`	`2048x2048`
`16:9`	`1332x750`	`2048x1152`
`9:16`	`750x1332`	`1152x2048`
`21:9`	`1526x654`	`2048x876`
`2:1`	`1414x706`	`2048x1024`

The model’s primary contract is the “aspect ratio + resolution” pair: size is accepted from the same table and mapped back through it. The full list of 26 allowed size values is the sizes field in the catalog; a value outside the list returns 400.

Examples

import base64

img = client.images.generate(
    model="bytedance-seed/seedream-5-0-pro",
    prompt="Commercial catalog shot: a perfume bottle on wet stone, droplets, morning light",
    extra_body={"aspect_ratio": "4:5", "resolution": "1k"},
)
with open("perfume.png", "wb") as f:
    f.write(base64.b64decode(img.data[0].b64_json))

curl https://api.mixen.ai/v1/images/generations \
  -H "Authorization: Bearer $MIXEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "bytedance-seed/seedream-5-0-pro",
    "prompt": "Commercial catalog shot: a perfume bottle on wet stone, droplets, morning light",
    "aspect_ratio": "4:5",
    "resolution": "1k"
  }'

A vertical 2k cover

{
  "model": "bytedance-seed/seedream-5-0-pro",
  "prompt": "Travel magazine cover: a lone figure on a dune at sunrise",
  "aspect_ratio": "9:16",
  "resolution": "2k"
}

A composite edit from two references

The model accepts reference images (references: true), so /v1/images/edits with multipart/form-data is available — up to 5 references:

curl https://api.mixen.ai/v1/images/edits \
  -H "Authorization: Bearer $MIXEN_API_KEY" \
  -F model=bytedance-seed/seedream-5-0-pro \
  -F image=@product.png \
  -F image=@marble.png \
  -F prompt="Move the bottle onto this marble surface, add a soft reflection"

The answer always carries b64_json — files are not hosted. Both endpoints answer synchronously; set your HTTP client timeout to at least 120 seconds.

Price

The price depends on the resolution — 2k is exactly twice the 1k price:

Resolution	Price per image
`1k`	6.0162 ₽ ($0.0675)
`2k`	12.0324 ₽ ($0.135)

Current values — catalog.

Strengths and limits

Precise editing control, lifelike scenes and natural rendering — built for commercial visuals.
Thirteen frame formats, including the ultra-wide 21:9 and 9:21.
Up to 5 reference images in /v1/images/edits — composite edits from several references.
A larger format costs more: 2k is twice the 1k price — budget the resolution up front.
Seedream 5.0 Lite (bytedance-seed/seedream-5-0-lite) — lighter and cheaper: 4.6793 ₽ ($0.0525), 2k/4k resolutions without 1k, the same formats and references.
Balance only; no quality knob — a size outside the model’s table returns 400.

All models — in the catalog. The general image workflow — images guide.