> ## 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 Beta > - GPT Image 2 (gpt-image-2-beta) model supports text-to-image, image-to-image, and image editing modes - Asynchronous processing mode, use the returned task ID to [query status](/en/api-manual/task-management/get-task-detail) - Generated image links are valid for 24 hours, please save them promptly **Billing (per_call, by resolution tier):** - `auto` or `ratio + resolution`: billed by the `resolution` field at 1K / 2K / 4K (see `resolution`) - Explicit pixels `WxH`: auto-bucketed by total pixels — total ≤ 1.7 MP → 1K, total > 1.7 MP and ≤ 4.4 MP → 2K, total > 4.4 MP → 4K - `n` is fixed at 1; `quality` is not exposed on this channel ## OpenAPI ````yaml /en/api-manual/image-series/gpt-image-2/gpt-image-2-beta-image-generation.json POST /v1/images/generations openapi: 3.1.0 info: title: gpt-image-2-beta 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 APIs paths: /v1/images/generations: post: tags: - Image Generation summary: gpt-image-2-beta API description: >- - GPT Image 2 (gpt-image-2-beta) model supports text-to-image, image-to-image, and image editing modes - Asynchronous processing mode, use the returned task ID to [query status](/en/api-manual/task-management/get-task-detail) - Generated image links are valid for 24 hours, please save them promptly **Billing (per_call, by resolution tier):** - `auto` or `ratio + resolution`: billed by the `resolution` field at 1K / 2K / 4K (see `resolution`) - Explicit pixels `WxH`: auto-bucketed by total pixels — total ≤ 1.7 MP → 1K, total > 1.7 MP and ≤ 4.4 MP → 2K, total > 4.4 MP → 4K - `n` is fixed at 1; `quality` is not exposed on this channel operationId: createImageGeneration requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/ImageGenerationRequest' examples: text_to_image: summary: Text to Image (default auto / 1K tier) value: model: gpt-image-2-beta prompt: A beautiful colorful sunset over the ocean ratio_with_resolution: summary: Ratio + resolution tier (16:9 / 4K) value: model: gpt-image-2-beta prompt: A beautiful colorful sunset over the ocean size: '16:9' resolution: 4K explicit_pixels: summary: Explicit pixels (4K UHD, billed by total pixels) value: model: gpt-image-2-beta prompt: A beautiful colorful sunset over the ocean size: 3840x2160 responses: '200': description: Image 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-beta' 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 enum: - gpt-image-2-beta default: gpt-image-2-beta example: gpt-image-2-beta prompt: type: string description: >- Prompt describing the image you want to generate, or describing how to edit the input image. Limited to 2000 tokens example: A beautiful colorful sunset over the ocean maxLength: 2000 size: type: string description: >- Aspect ratio of the generated image. Choose one of the supported ratios, or use `auto` to let the model decide: - `auto`: Determined automatically by the model (default), billed at the 1K tier - `1:1`: Square - `3:2` / `2:3`: Landscape / Portrait - `4:3` / `3:4`: Landscape / Portrait - `5:4` / `4:5`: Common social media - `16:9` / `9:16`: Widescreen landscape / portrait - `21:9` / `9:21`: Ultra-wide landscape / portrait - `2:1` / `1:2`: Landscape / Portrait - `3:1` / `1:3`: Panorama landscape / portrait **Explicit pixels `WxH`** are also supported (e.g. `1024x1024` / `1920x1080` / `3840x2160`). When using explicit pixels, the `resolution` field is ignored, and the billing tier is auto-bucketed by total pixels: - Total pixels ≤ 1.7 MP → 1K - Total pixels > 1.7 MP and ≤ 4.4 MP → 2K - Total pixels > 4.4 MP → 4K **Hard pixel limits:** - Both width and height must be multiples of `16` - Total pixels: `655,360` (≈ 0.65 MP) ~ `8,294,400` (≈ 8.29 MP) - Each side ≤ `3840` - Aspect ratio ≤ `3:1` default: auto example: '16:9' resolution: type: string description: >- Resolution tier, only effective when `size` is a ratio. **When ignored:** - `size=auto`: billed at the 1K tier (no need to pass this parameter) - `size` is explicit `WxH` pixels: this field is ignored, and the tier is auto-bucketed by total pixels (see `size` description) **Pricing multiplier:** - `1K`: 1× base (default) - `2K`: 1.7× base - `4K`: 2.6× base **Landscape / square output dimensions** (portrait dimensions are the landscape width/height swapped): | 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. enum: - 1K - 2K - 4K default: 1K example: 1K image_urls: type: array description: >- Reference image URL list for image-to-image and image editing features **Notes:** - Up to `16` reference images per request - Supported formats: `.jpeg`, `.jpg`, `.png`, `.webp` - Image URLs must be directly accessible by the server, or URLs that trigger direct download (typically URLs ending with image extensions like `.png`, `.jpg`) items: type: string format: uri example: - https://example.com/image1.png - https://example.com/image2.png maxItems: 16 callback_url: type: string description: >- HTTPS callback URL for task completion **Callback Timing:** - Triggered when task is completed, failed, or cancelled - Sent after billing confirmation **Security Restrictions:** - HTTPS protocol only - Internal IP addresses are 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 after failure (at `1`/`2`/`4` seconds after failure) - Callback response format is consistent with task query API - 2xx status code is considered successful, other codes 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-beta object: type: string enum: - image.generation.task description: Task object 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: Async 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 consumption 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 ``` ````