> ## 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. # Nanobanana-2 Image Generation Beta > - Nano Banana 2 Beta (nano-banana-2-beta) 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/nanobanana/nanobanana-2-beta-image-generate.json POST /v1/images/generations openapi: 3.1.0 info: title: Nano Banana 2 Beta Interface description: >- Create image generation tasks using AI models, supporting various models and parameter configurations license: name: MIT version: 1.0.0 servers: - url: https://api.evolink.ai description: Production environment security: - bearerAuth: [] tags: - name: Image Generation description: AI image generation related APIs paths: /v1/images/generations: post: tags: - Image Generation summary: Nano Banana 2 Beta Interface description: >- - Nano Banana 2 Beta (nano-banana-2-beta) 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: createImageGenerationNanoBanana2Beta requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/ImageGenerationRequest' examples: text_to_image: summary: Text to Image value: model: nano-banana-2-beta prompt: A cat playing on the grass 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: nano-banana-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 example: nano-banana-2-beta enum: - nano-banana-2-beta default: nano-banana-2-beta prompt: type: string description: >- Prompt describing the image to be generated, or describing how to edit the input image, limited to 2000 tokens example: A cat playing in the grass maxLength: 2000 size: type: string description: Aspect ratio of the generated image, default is `auto` enum: - auto - '1:1' - '1:4' - '4:1' - '1:8' - '8:1' - '2:3' - '3:2' - '3:4' - '4:3' - '4:5' - '5:4' - '9:16' - '16:9' - '21:9' quality: type: string description: |- Quality of the generated image, default is `2K` **Note:** - Different quality levels have different pricing enum: - 1K - 2K - 4K image_urls: type: array description: >- Reference image URL list for image-to-image and image editing functions **Note:** - Maximum number of input images per request: `14` - Image size: not exceeding `10MB` - 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`) - Maximum of `4` real person images can be uploaded items: type: string format: uri example: - https://example.com/image1.png - https://example.com/image2.png model_params: type: object description: Model extension parameters properties: thinking_level: type: string description: >- Thinking level, controls the depth of reasoning the model performs before generating images, defaults to `auto` - `auto`: Automatically selects thinking level - `min`: Minimal reasoning, fastest - `high`: Deep reasoning, best quality enum: - auto - min - high example: auto 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: 1757165031 id: type: string description: Task ID example: task-unified-1757165031-uyujaw3d model: type: string description: Actual model name used example: nano-banana-2-beta 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: 45 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: 8.7 user_group: type: string description: User group category enum: - default - vip 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 ``` ````