> ## Documentation Index > Fetch the complete documentation index at: https://docs.goenhance.ai/llms.txt > Use this file to discover all available pages before exploring further. # Seedream 5.0 Flash > Seedream 5.0 Flash text-to-image and image-to-image — the fast, low-cost Seedream tier. Pass `image_list` to use reference images (up to 10), or omit it for pure text-to-image. Always returns a single image. To split an image into editable layers, use the separate [seedream-5-flash-layers](./seedream-5-flash-layers) model instead. #### Transparent output Set `background` to `transparent` to keep an existing alpha channel. It needs exactly one input image, and that image must be a PNG that already has transparent pixels. It keeps the transparency you already have; it does not remove backgrounds. Output is png. #### Pricing | What | Tokens | USD | |---|---|---| | Output, 1K, 1.5K or 2K | 1.11 | $0.0222 | | Reference images | Free | Free | All three quality tiers cost the same, so 2K is the default. Example: a 2K image with 3 reference images costs 1.11 tokens. Returns an `img_uuid`; poll GET /api/v1/jobs/detail (or use `custom_callback_url`) to get the generated image. ## OpenAPI ````yaml api-reference/image-api/openapi-seedream-5-flash.json POST /api/v1/images/generations openapi: 3.1.0 info: title: GoEnhance API - Seedream 5.0 Flash description: Seedream 5.0 Flash version: 1.0.0 servers: - url: https://api.goenhance.ai security: [] paths: /api/v1/images/generations: post: tags: - ImageAPI summary: Seedream 5.0 Flash description: >- Seedream 5.0 Flash text-to-image and image-to-image — the fast, low-cost Seedream tier. Pass `image_list` to use reference images (up to 10), or omit it for pure text-to-image. Always returns a single image. To split an image into editable layers, use the separate [seedream-5-flash-layers](./seedream-5-flash-layers) model instead. #### Transparent output Set `background` to `transparent` to keep an existing alpha channel. It needs exactly one input image, and that image must be a PNG that already has transparent pixels. It keeps the transparency you already have; it does not remove backgrounds. Output is png. #### Pricing | What | Tokens | USD | |---|---|---| | Output, 1K, 1.5K or 2K | 1.11 | $0.0222 | | Reference images | Free | Free | All three quality tiers cost the same, so 2K is the default. Example: a 2K image with 3 reference images costs 1.11 tokens. Returns an `img_uuid`; poll GET /api/v1/jobs/detail (or use `custom_callback_url`) to get the generated image. parameters: - name: Authorization in: header description: '' required: false example: '{{Authorization}}' schema: type: string requestBody: content: application/json: schema: type: object properties: model: type: string enum: - seedream-5-flash description: Model name. Must be `seedream-5-flash`. prompt: type: string minLength: 1 maxLength: 2000 description: Text prompt describing the image. ratio: type: string enum: - auto - '1:1' - '2:3' - '3:2' - '3:4' - '4:3' - '4:5' - '5:4' - '9:16' - '16:9' - '21:9' - '9:21' description: >- Output aspect ratio. Defaults to auto, which lets the model choose the framing from your prompt. default: auto image_size: type: string enum: - 1K - 1.5K - 2K default: 2K description: >- Output quality tier. 1K, 1.5K and 2K all cost the same, so the default is 2K. image_list: type: array items: type: object properties: url: type: string format: uri required: - url description: >- Optional reference images for image-to-image or editing, [{"url": "https://..."}]. Up to 10 images, each up to 30MB. Reference images are free. minItems: 1 maxItems: 10 background: type: string enum: - opaque - transparent default: opaque description: >- Set to `transparent` to keep an existing alpha channel. Needs exactly one input image, a PNG that already has transparent pixels (this does not remove backgrounds). Output is png; combining it with `output_format: jpeg` is rejected. output_format: type: string enum: - png - jpeg default: jpeg description: >- Output file format. Defaults to png when `background` is `transparent`. custom_callback_url: type: string format: uri description: >- Optional. A publicly accessible HTTPS URL. When the task status changes (processing / success / failed), GoEnhance sends a POST request to this URL. The request body is identical to the response of GET /api/v1/jobs/detail. If your server does not respond with HTTP 200, the notification is retried up to 3 times, with a 3-second timeout per attempt. example: https://your-server.com/goenhance/callback required: - model - prompt example: model: seedream-5-flash prompt: A serene Japanese garden at dawn, soft light image_size: 2K ratio: '16:9' responses: '200': description: '' content: application/json: schema: type: object properties: code: type: integer msg: type: string data: type: object properties: img_uuid: type: string cost: type: number description: >- Tokens deducted for this request. This is the amount actually charged, so it already reflects any discount active on your account and can be lower than the listed price. Tokens are deducted when the task is accepted, and refunded automatically if the generation ends in failure. example: 1.11 required: - img_uuid - cost required: - code - msg - data examples: '1': summary: Success value: code: 0 msg: Success data: img_uuid: c12b656c-747a-44fd-9c80-add79b0c52d5 cost: 1.11 '2': summary: Insufficient tokens value: code: 100 msg: tokens is not enough quota: summary: API key quota exceeded value: code: 101 msg: 'API key quota exceeded: 4990 of 5000 tokens used (monthly)' headers: {} '401': description: '' content: application/json: schema: type: object properties: code: type: integer msg: type: string required: - code - msg headers: {} deprecated: false security: [] ````