> ## Documentation Index > Fetch the complete documentation index at: https://evolink.ai/docs/llms.txt > Use this file to discover all available pages before exploring further. # MiniMax H3 Image Generation > - MiniMax H3 Image (minimax-h3-image) supports text-to-image generation and image editing, with up to 16 reference images - Output up to 20 million pixels: combine an aspect ratio with a 1K / 2K / 4K resolution tier, or specify width and height in pixels - Asynchronous processing: use the returned task ID to [query the task](/en/api-manual/task-management/get-task-detail) - Generated image links are valid for 24 hours. Save the results promptly ## OpenAPI ````yaml en/api-manual/image-series/minimax-h3-image/minimax-h3-image-image-generation.json POST /v1/images/generations openapi: 3.1.0 info: title: minimax-h3-image API description: >- Create image tasks using AI models with support for multiple models and parameter configurations license: name: MIT version: 1.0.0 servers: - url: https://api.evolink.ai description: Production security: - bearerAuth: [] tags: - name: Image Generation description: AI image generation related APIs paths: /v1/images/generations: post: tags: - Image Generation summary: minimax-h3-image API description: >- - MiniMax H3 Image (minimax-h3-image) supports text-to-image generation and image editing, with up to 16 reference images - Output up to 20 million pixels: combine an aspect ratio with a 1K / 2K / 4K resolution tier, or specify width and height in pixels - Asynchronous processing: use the returned task ID to [query the task](/en/api-manual/task-management/get-task-detail) - Generated image links are valid for 24 hours. Save the results promptly operationId: createImageGenerationMinimaxH3Image requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/ImageGenerationRequest' examples: text_to_image: summary: Text to Image (simple) value: model: minimax-h3-image prompt: A beautiful colorful sunset over the ocean text_to_image_hd: summary: Text to Image (HD 16:9) value: model: minimax-h3-image prompt: Cinematic wide shot of a futuristic city skyline at dusk size: '16:9' resolution: 4K 'n': 1 text_to_image_pixel: summary: Text to Image (explicit pixels) value: model: minimax-h3-image prompt: Minimalist logo design size: 1024x1024 image_edit: summary: Image-to-Image / Edit value: model: minimax-h3-image prompt: Add a cute cat next to her size: '1:1' resolution: 1K image_urls: - https://example.com/input.png callback_url: https://your-domain.com/webhook/image-done batch_generation: summary: Batch generation value: model: minimax-h3-image prompt: A cute robot in pixel art style size: '1:1' resolution: 2K 'n': 4 responses: '200': description: Image generation task created successfully content: application/json: schema: $ref: '#/components/schemas/ImageGenerationResponse' '400': description: Invalid request parameters content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: invalid_request message: Invalid request parameters type: invalid_request_error '401': description: Unauthenticated, invalid or expired token content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: unauthorized message: Invalid or expired token type: authentication_error '402': description: Insufficient quota, recharge required content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: insufficient_quota message: Insufficient quota. Please top up your account. type: insufficient_quota '403': description: Access denied content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: model_access_denied message: 'Token does not have access to model: minimax-h3-image' type: invalid_request_error '429': description: Rate limit exceeded content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: rate_limit_exceeded message: Too many requests, please try again later type: rate_limit_error '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: internal_error message: Internal server error type: api_error components: schemas: ImageGenerationRequest: type: object required: - model - prompt properties: model: type: string description: >- Image generation model name. The official channel offers better stability and control for commercial use enum: - minimax-h3-image default: minimax-h3-image example: minimax-h3-image prompt: type: string description: >- Prompt describing the image to generate or how to edit the input images **Length limits:** - Up to `32,000` characters (counted as Unicode code points) - When `prompt_extend` is `false`, only approximately the first `4096` tokens of the prompt take effect example: A beautiful colorful sunset over the ocean maxLength: 32000 image_urls: type: array description: >- List of reference image URLs for image-to-image generation and image editing **Notes:** - Number of input images per request: `1~16` - Maximum size per image: `64MB` - Width and height of each image: `128` to `8192` px - Aspect ratio of each image: longest side / shortest side must not exceed `4:1` - Supported formats: `.jpeg`, `.jpg`, `.png`, `.webp`, `.heic`, `.heif` - Image URLs must be directly accessible by the server or trigger a direct download (these URLs usually end in an image extension such as `.png` or `.jpg`) - Reference images incur additional image input tokens in image-to-image generation and image editing items: type: string format: uri example: - https://example.com/image1.png - https://example.com/image2.png size: type: string description: >- Output image size. Supports **aspect ratios** and **explicit pixel dimensions**. Default: `auto` **① Aspect ratio (recommended):** `X:Y`. Common ratios: - `1:1`: square - `1:2` / `2:1`: tall / wide - `1:3` / `3:1`: extra tall / extra wide (at the 3:1 limit) - `2:3` / `3:2`: standard portrait / landscape - `3:4` / `4:3`: traditional portrait / landscape - `4:5` / `5:4`: common social media formats - `9:16` / `16:9`: mobile / desktop widescreen - `9:21` / `21:9`: ultrawide formats Other `X:Y` values are also supported: `X` and `Y` must be integers from `1` to `300`, with an aspect ratio `≤ 3:1` **② Explicit pixel dimensions:** `WxH` (or `W×H`), such as `1024x1024`, `2720x1536`, `5472x3072` - Pixel budget: `655,360 ≤ width × height ≤ 20,000,000` (approximately 0.65 MP to 20 MP) - Aspect ratio: `≤ 3:1` **③ `auto`:** the model chooses the aspect ratio automatically; the output area still follows the `resolution` tier **Out-of-range sizes:** - Sizes outside these limits return `400`; they are not automatically resized or rounded default: auto example: auto resolution: type: string description: >- Resolution shortcut. Applies when `size` is `auto` or an aspect ratio; ignored when explicit pixel dimensions are used **Pixel budget** (width and height are calculated from the target total pixel count and the `size` ratio): - `1K`: ~1 MP (1024² = 1,048,576 pixels) - `2K`: ~4 MP (2048² = 4,194,304 pixels) - `4K`: ~16.8 MP (4096² = 16,777,216 pixels) **Actual landscape / square output sizes** (portrait sizes swap the corresponding width and height; for example, `3:4` reverses `4:3`): | Aspect ratio | 2K | 4K | |---|---|---| | `1:1` | 2048×2048 | 4096×4096 | | `4:3` | 2368×1760 | 4736×3552 | | `16:9` | 2720×1536 | 5472×3072 | | `3:1` | 3552×1184 | 7104×2368 | **Notes:** - `1K` and `2K` use the same number of image output tokens (approximately `4,096` per image); `4K` uses approximately `16,384` per image. The returned `usage` is authoritative - Values are case-insensitive enum: - 1K - 2K - 4K default: 2K example: 2K output_format: type: string description: |- Output image format. Default: `jpeg` - `jpeg`: lossy compression, smaller files - `png`: lossless - `webp`: balance of file size and quality **Note:** - Transparent backgrounds are not supported enum: - jpeg - png - webp default: jpeg example: jpeg 'n': type: integer description: >- Number of images to generate. Each image is billed separately **Notes:** - Both text input tokens and image input tokens scale proportionally with `n` - If some images fail (for example, due to content safety checks), the task still completes with the successful images. The actual count is determined by `results` in the response, and billing follows the returned `usage` minimum: 1 maximum: 10 default: 1 example: 1 prompt_extend: type: boolean description: >- Prompt enhancement: the model rewrites the prompt with more detail before generation. Default: `true` **Notes:** - Can only be set to `false` for text-to-image generation when `size` is an aspect ratio or explicit pixel dimensions - Setting it to `false` when `size` is `auto` or `image_urls` is provided returns `400` - When enabled, it adds approximately `2,300` to `3,800` text input tokens per image; when disabled, only the original prompt is counted default: true example: true callback_url: type: string description: >- HTTPS callback address after task completion **Callback Timing:** - Triggered when task is completed, failed, or cancelled - Sent after billing confirmation is completed **Security Restrictions:** - Only HTTPS protocol is supported - Callback to internal IP addresses is prohibited (127.0.0.1, 10.x.x.x, 172.16-31.x.x, 192.168.x.x, etc.) - URL length must not exceed `2048` characters **Callback Mechanism:** - Timeout: `10` seconds - Maximum `3` retries on failure (retries after `1` second/`2` seconds/`4` seconds) - Callback response body format is consistent with the task query API response format - Callback address returning 2xx status code is considered successful, other status codes will trigger retry format: uri example: https://your-domain.com/webhooks/image-task-completed ImageGenerationResponse: type: object properties: created: type: integer description: Task creation timestamp example: 1757156493 id: type: string description: Task ID example: task-unified-1757156493-imcg5zqt model: type: string description: Actual model name used example: minimax-h3-image object: type: string enum: - image.generation.task description: Specific task type progress: type: integer description: Task progress percentage (0-100) minimum: 0 maximum: 100 example: 0 status: type: string description: Task status enum: - pending - processing - completed - failed example: pending task_info: $ref: '#/components/schemas/TaskInfo' description: Asynchronous task information type: type: string enum: - text - image - audio - video description: Task output type example: image usage: $ref: '#/components/schemas/Usage' description: Usage and billing information ErrorResponse: type: object properties: error: type: object properties: code: type: string description: Error code identifier message: type: string description: Error description type: type: string description: Error type TaskInfo: type: object properties: can_cancel: type: boolean description: Whether the task can be cancelled example: true estimated_time: type: integer description: Estimated completion time (seconds) minimum: 0 example: 100 Usage: type: object description: Usage and billing information properties: billing_rule: type: string description: Billing rule enum: - per_call - per_token - per_second example: per_call credits_reserved: type: number description: Estimated credits consumed minimum: 0 example: 2.5 user_group: type: string description: User group category example: default securitySchemes: bearerAuth: type: http scheme: bearer description: >- ##All APIs require Bearer Token authentication## **Get API Key:** Visit [API Key Management Page](https://evolink.ai/dashboard/keys) to get your API Key **Add to request header:** ``` Authorization: Bearer YOUR_API_KEY ``` ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.