> ## Documentation Index > Fetch the complete documentation index at: https://docs.evolink.ai/llms.txt > Use this file to discover all available pages before exploring further. # GPT Image 2 Image Generation > - GPT Image 2 (gpt-image-2) model supports text-to-image, image-to-image, image editing and other generation modes - Asynchronous processing mode, use the returned task ID to [query](/en/api-manual/task-management/get-task-detail) - Generated image links are valid for 24 hours, please save them promptly ## OpenAPI ````yaml /en/api-manual/image-series/gpt-image-2/gpt-image-2-image-generation.json POST /v1/images/generations openapi: 3.1.0 info: title: gpt-image-2 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: gpt-image-2 API description: >- - GPT Image 2 (gpt-image-2) model supports text-to-image, image-to-image, image editing and other generation modes - Asynchronous processing mode, use the returned task ID to [query](/en/api-manual/task-management/get-task-detail) - Generated image links are valid for 24 hours, please save them promptly operationId: createImageGenerationGptImage2 requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/ImageGenerationRequest' examples: text_to_image: summary: Text to Image (simple) value: model: gpt-image-2 prompt: A beautiful colorful sunset over the ocean text_to_image_hd: summary: Text to Image (HD 16:9) value: model: gpt-image-2 prompt: Cinematic wide shot of a futuristic city skyline at dusk size: '16:9' resolution: 4K quality: high 'n': 1 text_to_image_pixel: summary: Text to Image (explicit pixels) value: model: gpt-image-2 prompt: Minimalist logo design size: 1024x1024 quality: medium image_edit: summary: Image-to-Image / Edit value: model: gpt-image-2 prompt: Add a cute cat next to her size: '1:1' resolution: 1K quality: medium image_urls: - https://example.com/input.png callback_url: https://your-domain.com/webhook/image-done batch_generation: summary: Batch generation value: model: gpt-image-2 prompt: A cute robot in pixel art style size: '1:1' resolution: 2K quality: high '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: gpt-image-2' 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, official channel, better stability and controllability, suitable for commercial scenarios enum: - gpt-image-2 default: gpt-image-2 example: gpt-image-2 prompt: type: string description: >- Prompt describing the image to be generated, or describing how to edit the input image **Limits:** - Up to `32000` characters (counted by Unicode code points, works for CJK and other languages) example: A beautiful colorful sunset over the ocean maxLength: 32000 image_urls: type: array description: >- Reference image URL list for image-to-image and image editing functions **Note:** - Number of input images per request: `1~16` - Size of a single image: not exceeding `50MB` - Supported file formats: `.jpeg`, `.jpg`, `.png`, `.webp` - Image URLs must be directly accessible by the server, or the image URL should directly download when accessed (typically these URLs end with image file extensions, such as `.png`, `.jpg`) - In image-to-image / image editing scenarios, the reference images themselves also incur additional image input token consumption items: type: string format: uri example: - https://example.com/image1.png - https://example.com/image2.png size: type: string description: >- Size of the generated image. Supports both **ratio format** and **explicit pixel format**, defaults to `auto` **① Ratio format (recommended, 15 options)** - `1:1`: Square - `1:2` / `2:1`: Extreme portrait / landscape - `1:3` / `3:1`: Ultra portrait / landscape (3:1 limit) - `2:3` / `3:2`: Standard portrait / landscape - `3:4` / `4:3`: Classic portrait / landscape - `4:5` / `5:4`: Common social media - `9:16` / `16:9`: Mobile / desktop widescreen - `9:21` / `21:9`: Ultra-wide **② Explicit pixel format**: `WxH` (or `W×H`), e.g. `1024x1024`, `1536x1024`, `3840×2160` - Both width and height must be multiples of `16` - Each edge range: `[16, 3840]` - Pixel budget: `655,360 ≤ width × height ≤ 8,294,400` (about 0.65 MP ~ 8.29 MP) - Aspect ratio: `≤ 3:1` **③ `auto`**: The model decides the size automatically (`resolution` does not apply in this mode) **Out-of-range handling:** - If a ratio + `resolution` combination exceeds the pixel budget, dimensions are automatically scaled down proportionally (e.g. 4K 2:1 → 3840×1920) default: auto example: auto resolution: type: string description: >- Resolution tier shortcut, only effective when `size` is a ratio; ignored in explicit pixel mode **Pixel budget rules** (dimensions are derived from the target pixel count and the `size` ratio, aligned to multiples of 16): - `1K`: ~1 MP (1024² = 1,048,576 pixels) - `2K`: ~4 MP (2048² = 4,194,304 pixels) - `4K`: ~8.29 MP (3840×2160 = 8,294,400 pixels, the maximum) **Landscape / square output dimensions** (portrait dimensions are the landscape width/height swapped, e.g. `2:3` = `3:2` reversed): | Ratio | 1K | 2K | 4K | |---|---|---|---| | `1:1` | 1024×1024 | 2048×2048 | 2880×2880 | | `2:1` | 1456×720 | 2896×1456 | 3840×1920 \* | | `3:1` | 1776×592 | 3552×1184 | 3840×1280 \* | | `3:2` | 1248×832 | 2512×1680 | 3520×2352 | | `4:3` | 1184×880 | 2368×1776 | 3312×2480 \* | | `5:4` | 1152×912 | 2288×1824 | 3216×2576 | | `16:9` | 1360×768 | 2736×1536 | 3840×2160 (UHD) | | `21:9` | 1568×672 | 3136×1344 | 3840×1632 \* | \* Marks combinations that are auto-downscaled to fit the pixel budget. Values are case-insensitive. enum: - 1K - 2K - 4K default: 1K example: 1K quality: type: string description: >- Rendering quality that controls the model's "reasoning depth", directly affecting output token count and cost. Defaults to `medium` | Value | Tile base | Relative cost (1024²) | |---|---|---| | `low` | 16 | ~0.11× | | `medium` | 48 | 1.0× | | `high` | 96 | ~4.0× | enum: - low - medium - high default: medium example: medium 'n': type: integer description: |- Number of images to generate, each billed independently **Note:** - Text input tokens scale linearly with `n` minimum: 1 maximum: 10 default: 1 example: 1 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: gpt-image-2 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 ``` ````