Google - Nano Banana 2 Lite

This page is generated from the upstream official OpenAPI documentation. Endpoints, parameters and examples match the official docs; brand and API domain are replaced with ModelFold.

Endpoint

POST /jobs/createTask

Full URL: https://ai.modelfold.online/v1/jobs/createTask

Authentication: every request must include the Authorization: Bearer <API_KEY> header.

Create Task

Use this endpoint to create a new image generation task. Provide a text prompt, and optionally include image URLs as visual references.

Output: one JPEG image per task. The output format cannot be set; do not rely on the file extension in the result URL.

• Set image_urls to an empty array or omit it for pure text-to-image generation. Up to 10 images are supported.

• Supported aspect ratios: 1:1, 1:4, 1:8, 2:3, 3:2, 3:4, 4:1, 4:3, 4:5, 5:4, 8:1, 9:16, 16:9, 21:9, auto.

• Get Task Details — After submission, use the unified query endpoint to check task progress and retrieve results

TIP

For production use, we recommend providing the callBackUrl parameter so your service can receive completion notifications instead of polling for task status.

Related Resources

• Model Marketplace — Explore all available models and capabilities
• Common API — Check account credits and usage

Request Parameters

Body (application/json)

Parameter	Type	Required	Description
model	string	Yes	The model name used for generation. This field is required. This endpoint must use the nano-banana-2-lite model. Default："nano-banana-2-lite"。 Allowed values：nano-banana-2-lite。 示例：nano-banana-2-lite。
callBackUrl	string	No	Callback URL for task completion notifications. Optional parameter. If provided, the system will send a POST request to this URL when the task completes, whether it succeeds or fails. If omitted, no callback notification will be sent. To ensure callback security, see Webhook Verification Guide. 示例：https://your-domain.com/api/callback。
input	object	Yes	Input parameters for the image generation task.
input.image_urls	array<string>	No	Input image URL array. Optional parameter. Set to an empty array or omit it for pure text-to-image generation. Supports up to 10 images. - Please provide uploaded file URLs, not raw file content - Accepted types: image/jpeg, image/png, image/webp - Max size: 30.0MB Default：[]。
input.prompt	string	Yes	Text prompt used to generate the image. Required. Maximum length: 20000 characters. 示例：Generate a pig on the grass, cinematic light。
input.aspect_ratio	string	Yes	Required. Aspect ratio of the output image. Use "auto" to let the model decide. Allowed values：1:1 / 1:4 / 1:8 / 2:3 / 3:2 / 3:4 / 4:1 / 4:3 / 4:5 / 5:4 / 8:1 / 9:16 / 16:9 / 21:9 / auto。 示例：auto。

Request Example

curl -X POST "https://ai.modelfold.online/v1/jobs/createTask" \
  -H "Authorization: Bearer $MODELFOLD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "nano-banana-2-lite",
  "callBackUrl": "https://your-domain.com/api/callback",
  "input": {
    "image_urls": [
      "https://file.aiquickdraw.com/custom-page/akr/section-images/1756223420389w8xa2jfe.png"
    ],
    "prompt": "Generate a pig on the grass, cinematic light",
    "aspect_ratio": "auto"
  }
}'

{
  "model": "nano-banana-2-lite",
  "callBackUrl": "https://your-domain.com/api/callback",
  "input": {
    "image_urls": [
      "https://file.aiquickdraw.com/custom-page/akr/section-images/1756223420389w8xa2jfe.png"
    ],
    "prompt": "Generate a pig on the grass, cinematic light",
    "aspect_ratio": "auto"
  }
}

Response

200 — Request successful

{
  "code": 200,
  "msg": "success",
  "data": {
    "taskId": "task_nanobanana_1765180586443"
  }
}

Callback

onImageGenerated

Callback URL: {$request.body#/callBackUrl} (the callBackUrl in the request body).

Sent when the task succeeds or fails.

Callback body parameters

参数	类型	必填	说明
code	integer	否	200: success. 501: failure; see data.failCode and data.failMsg. Allowed values：200 / 501。 示例：200。
msg	string	否	Status message 示例：Playground task completed successfully.。
data	object	否	—
data.completeTime	integer	否	Task completion time, represented as a Unix timestamp in milliseconds 示例：1786429387000。
data.costTime	integer	否	Processing time in seconds. Present on both success and failure callbacks. 示例：135。
data.createTime	integer	否	Task creation time, represented as a Unix timestamp in milliseconds 示例：1786429251000。
data.creditsConsumed	number	否	Credits consumed by the task; 0 for failed tasks. 示例：3。
data.model	string	否	Image generation model used for the task 示例：nano-banana-2-lite。
data.param	string	否	Parameters submitted when creating the task, in JSON string format 示例：{"input":"{\"aspect_ratio\":\"auto\",\"image_urls\":[\"https://file.aiquickdraw.com/custom-page/akr/section-images/1756223420389w8xa2jfe.png\"],\"prompt\":\"Generate a pig on the grass, cinematic light\"}","callBackUrl":"https://your-domain.com/api/callback","model":"nano-banana-2-lite"}。
data.resultJson	string	否	Image generation result in JSON string format. resultUrls contains the list of generated image URLs. Present only when state is success. 示例：{"resultUrls":["https://tempfile.aiquickdraw.com/ggc/226095d9935c83a8a0b4f0e50c235219_1786429384006.jpeg"]}。
data.state	string	否	Task status Allowed values：success / fail。 示例：success。
data.taskId	string	否	Task ID 示例：226095d9935c83a8a0b4f0e50c235219。
data.updateTime	integer	否	Use completeTime as the completion time; updateTime may equal createTime. 示例：1786429387000。
data.failCode	string	否	Failure code, a numeric string such as "400" or "500". Present only when state is fail. 示例：500。
data.failMsg	string	否	Failure reason. Present only when state is fail. 示例：<error detail>。

Success

{
  "code": 200,
  "msg": "Playground task completed successfully.",
  "data": {
    "taskId": "226095d9935c83a8a0b4f0e50c235219",
    "model": "nano-banana-2-lite",
    "state": "success",
    "param": "{\"input\":\"{\\\"aspect_ratio\\\":\\\"auto\\\",\\\"image_urls\\\":[\\\"https://file.aiquickdraw.com/custom-page/akr/section-images/1756223420389w8xa2jfe.png\\\"],\\\"prompt\\\":\\\"Generate a pig on the grass, cinematic light\\\"}\",\"callBackUrl\":\"https://your-domain.com/api/callback\",\"model\":\"nano-banana-2-lite\"}",
    "resultJson": "{\"resultUrls\":[\"https://tempfile.aiquickdraw.com/ggc/226095d9935c83a8a0b4f0e50c235219_1786429384006.jpeg\"]}",
    "completeTime": 1786429387000,
    "createTime": 1786429251000,
    "costTime": 135,
    "creditsConsumed": 3,
    "updateTime": 1786429387000
  }
}

Failure

{
  "code": 501,
  "msg": "Playground task failed.",
  "data": {
    "taskId": "226095d9935c83a8a0b4f0e50c235219",
    "model": "nano-banana-2-lite",
    "state": "fail",
    "param": "{\"input\":\"{\\\"aspect_ratio\\\":\\\"auto\\\",\\\"image_urls\\\":[\\\"https://file.aiquickdraw.com/custom-page/akr/section-images/1756223420389w8xa2jfe.png\\\"],\\\"prompt\\\":\\\"Generate a pig on the grass, cinematic light\\\"}\",\"callBackUrl\":\"https://your-domain.com/api/callback\",\"model\":\"nano-banana-2-lite\"}",
    "failCode": "500",
    "failMsg": "<error detail>",
    "completeTime": 1786429387000,
    "createTime": 1786429251000,
    "costTime": 135,
    "creditsConsumed": 0,
    "updateTime": 1786429387000
  }
}