Image generation

Bailian Qwen-Image series

Generate images with Tongyi Qwen Bailian Qwen-Image models. The API supports prompt rewriting and strong Chinese-style semantic understanding.

Basics

Endpoint: POST /v1/images/generations
Auth: Bearer Token
Content-Type: application/json

Model overview

Wan models

Model	Summary	Output image format
wan2.6-t2i `recommended`	Wan 2.6 supports flexible sizing under total-pixel and aspect-ratio constraints (same as wan2.5).	Resolution: total pixels between [12801280, 14401440]; aspect ratio [1:4, 4:1]; format: PNG
wan2.5-t2i-preview `recommended`	Wan 2.5 preview supports flexible sizing under pixel/aspect constraints (for example 768*2700; versions <=2.2 cap one side at 1400).
wan2.2-t2i-flash	Wan 2.2 flash is ~50% faster than 2.1.	Resolution: width and height both in [512, 1440]; format: PNG
wan2.2-t2i-plus	Wan 2.2 pro provides improved stability and success rate vs 2.1.
wanx2.1-t2i-turbo	Wan 2.1 turbo.
wanx2.1-t2i-plus	Wan 2.1 plus.
wanx2.0-t2i-turbo	Wan 2.0 turbo.

Qwen models

Model	Summary	Output image spec
qwen-image-2.0-pro	Qwen image generation/editing Pro series. Stronger text rendering, realism, and semantic following.	Resolution: free width/height, with output dimensions each within 512 to 2048. Default resolution is `2028*2048`. Format: PNG. Count: 1-6 images.
qwen-image-plus-2026-01-09	Qwen image generation Plus series, good at diverse styles and text rendering.	Default resolution `1664928`. Optional resolutions/aspect ratios: `1664928` (default) 16:9, `14721104` 4:3, `13281328` 1:1, `11041472` 3:4, `9281664` 9:16.
qwen-image

Request headers

Content-Type string (required) Must be application/json. Authorization string (required) Bearer API key auth. Example: Bearer sk-xxxx.

Request body

Field	Type	Required	Description
model	`string`	Yes	Model name, e.g. `qwen-image-plus` or `qwen-image-max`.
input	`object`	Yes	Image description payload.
└─ messages	`array[object]`	Yes	Message list.
└─ └─ role	`string`	No	Role.
└─ └─ content	`array[object]`
└─ └─ └─ text	`string`		Prompt text.
parameters	`object`	No	Generation controls.
└─ negative_prompt	`string`	No	Negative prompt for undesired content. Supports Chinese/English, max 500 chars (extra chars are truncated). Example: low resolution, low quality, distorted limbs/fingers, oversaturated colors, waxy skin, low face detail, over-smoothing, AI-looking artifacts, chaotic composition, blurry/warped text.
└─ prompt_extend	`boolean`	No	Enable smart prompt rewriting. This optimizes only the positive prompt. `true` (default): enable rewriting for richer details. `false`: disable for tighter control.
└─ watermark	`boolean`	No	Add `Qwen-Image` watermark at bottom-right. Default `false`.
└─ size	`string`	No	Output size, e.g. `13281328`, `10241024`; width and height must both be 512-1440.
└─ n	`integer`	No	Number of images. Range 1-4, default `4`. Billed per image; set to 1 for testing.
└─ seed	`integer`	No	Random seed in `[0,2147483647]`. Same seed can improve consistency, but exact results are still not guaranteed.

Response

Status: 200 OK

Field	Type	Description
created	`integer`	Unix timestamp.
data	`array`	Generated images list.
└─ url	`string`	Download URL.
└─ b64_json	`string`	Base64 image data (when requested).
└─ revised_prompt	`string`	Final AI-optimized prompt.

Request example

{
  "model": "wan2.2-t2i-flash",
  "prompt": "A kitten running on grass, cinematic look, natural light and shadow",
  "size": "960*1390"
}

Response example

{
  "created": 1713833628,
  "data": [
    {
      "url": "https://example.com/qwen_output_image.png",
      "b64_json": "",
      "revised_prompt": ""
    }
  ]
  ...
}

Developer tips

Language understanding: Qwen models are strong at Chinese idioms, couplets, and Chinese aesthetics (e.g. Yueyang Tower, blue-and-white porcelain).
Prompt optimization: Keep prompt_extend: true to get richer image details.

Basics

Relay overview

Images

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Chat

Privacy and terms

Bailian Qwen-Image series

Basics

Model overview

Wan models

Qwen models

Request headers

Request body

Response

Request example

Response example

Developer tips

​Bailian Qwen-Image series

​Basics

​Model overview

​Wan models

​Qwen models

​Request headers

​Request body

​Response

​Request example

​Response example

​Developer tips

Bailian Qwen-Image series

Basics

Model overview

Wan models

Qwen models

Request headers

Request body

Response

Request example

Response example

Developer tips