Create Nano Banana task

POST

images

curl --request POST \
  --url https://sigrunai.com/v1/images \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "gpt-image-2",
  "prompt": "Minimal product still life, white background, soft light",
  "quality": "medium",
  "n": 1,
  "ratio": "1:1"
}
'

{
  "code": 20000,
  "msg": "<string>",
  "data": {
    "task_id": "<string>",
    "status": "<string>",
    "progress": 123,
    "model": "<string>",
    "created_at": 123,
    "completed_at": 123,
    "cost": 123,
    "error_message": "<string>",
    "result": {
      "image_url": "<string>",
      "video_url": "<string>"
    }
  }
}

Create an async Nano Banana image task. Poll with Query image task and read result.image_url when completed. For GPT Image 2, see Create GPT Image 2 task.

Models

`model`	Notes	`resolution`	Billing key examples
`nano-banana-2`	Balanced; draft through 4K	`0.5k` / `1k` / `2k` / `4k`	`nanobanana2-1k`
`nano-banana-2.1`	Fast iteration with better detail and text	`1k` / `2k` / `4k`	`nanobanana2.1-2k`
`nano-banana-pro`	Commercial detail and lighting	`1k` / `2k` / `4k`	`nanobananapro-4k`

Billing is by resolution (per_task, 1 image per request). Check Model catalog and the create response cost for live prices.

Request body

Field	Type	Required	Description
`model`	string	yes	See table above
`prompt`	string	conditional	Required for text-to-image; optional when `images` is set. Up to 10000 characters
`n`	int	no	Always 1
`ratio`	string	no	Aspect ratio; `size` is an alias. Common: `1:1` / `9:16` / `16:9` / `auto`
`size`	string	no	Alias of `ratio`
`resolution`	string	no	Resolution tier, default `1k` (see table)
`images`	string[]	no	Public reference image URLs, max 5

Examples

Text-to-image (Nano Banana 2)

curl -X POST 'https://sigrunai.com/v1/images' \
  -H 'Authorization: Bearer sk_xxx' \
  -H 'Content-Type: application/json' \
  -d '{
    "model": "nano-banana-2",
    "prompt": "Cinematic sunset over a lake, golden light on distant mountains",
    "ratio": "16:9",
    "resolution": "2k"
  }'

Image-to-image (Nano Banana Pro)

curl -X POST 'https://sigrunai.com/v1/images' \
  -H 'Authorization: Bearer sk_xxx' \
  -H 'Content-Type: application/json' \
  -d '{
    "model": "nano-banana-pro",
    "prompt": "Keep the product look, switch to soft studio lighting",
    "ratio": "1:1",
    "resolution": "4k",
    "images": ["https://example.com/product.jpg"]
  }'

Nano Banana 2.1

curl -X POST 'https://sigrunai.com/v1/images' \
  -H 'Authorization: Bearer sk_xxx' \
  -H 'Content-Type: application/json' \
  -d '{
    "model": "nano-banana-2.1",
    "prompt": "Product poster with clear Chinese title, clean background",
    "ratio": "1:1",
    "resolution": "1k"
  }'

Success response:

{
  "code": 20000,
  "msg": "提交成功",
  "data": {
    "task_id": "img_xxxxxxxx",
    "status": "queued",
    "progress": 0,
    "model": "nanobanana2-2k",
    "cost": 0.05,
    "result": {}
  }
}

Authorizations

Authorization

string

header

required

控制台创建的 API Key，格式：Bearer sk_xxx

Body

application/json

model

string

required

gpt-image-2 (plus low/medium/high) or nano-banana-2 / nano-banana-2.1 / nano-banana-pro

Example:

"nano-banana-2"

prompt

string

GPT Image 2 max 4000; Nano Banana max 10000. Optional when images are provided

Required string length: 1 - 10000

quality

enum<string>

default:auto

Available options:

auto,

low,

medium,

high

integer

default:1

Required range: 1 <= x <= 4

ratio

string

size

string

ratio 别名

resolution

string

Nano Banana: 0.5k/1k/2k/4k depending on model

images

string<uri>[]

Reference image URLs. GPT Image 2 max 15; Nano Banana max 5

Maximum array length: 15

Response

200 - application/json

提交成功

code

integer

Example:

20000

msg

string

data

object

Show child attributes

Last modified on October 18, 2026

⌘I

curl --request POST \
  --url https://sigrunai.com/v1/images \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "gpt-image-2",
  "prompt": "Minimal product still life, white background, soft light",
  "quality": "medium",
  "n": 1,
  "ratio": "1:1"
}
'

{
  "code": 20000,
  "msg": "<string>",
  "data": {
    "task_id": "<string>",
    "status": "<string>",
    "progress": 123,
    "model": "<string>",
    "created_at": 123,
    "completed_at": 123,
    "cost": 123,
    "error_message": "<string>",
    "result": {
      "image_url": "<string>",
      "video_url": "<string>"
    }
  }
}

​Models

​Request body

​Examples

​Text-to-image (Nano Banana 2)

​Image-to-image (Nano Banana Pro)

​Nano Banana 2.1

Authorizations

Body

Response

Models

Request body

Examples

Text-to-image (Nano Banana 2)

Image-to-image (Nano Banana Pro)

Nano Banana 2.1