# Flux-2 - Text to Image
## OpenAPI Specification
```yaml
openapi: 3.0.1
info:
title: ''
description: ''
version: 1.0.0
paths:
/api/v1/jobs/createTask:
post:
summary: Flux-2 - Text to Image
deprecated: false
description: >
High-quality photorealistic image generation powered by Flux-2's
advanced AI model
## Query Task Status
After submitting a task, use the unified query endpoint to check
progress and retrieve results:
Learn how to query task status and retrieve generation results
::: tip[]
For production use, we recommend using the `callBackUrl` parameter to
receive automatic notifications when generation completes, rather than
polling the status endpoint.
:::
## Related Resources
Explore all available models
Check credits and account usage
operationId: flux-2-flex-text-to-image
tags:
- docs/en/Market/Image Models/Flux-2
parameters: []
requestBody:
content:
application/json:
schema:
type: object
required:
- model
properties:
model:
type: string
enum:
- flux-2/flex-text-to-image
default: flux-2/flex-text-to-image
description: >-
Model name for the generation task. Required field.
- This endpoint must use the `flux-2/flex-text-to-image`
model
examples:
- flux-2/flex-text-to-image
callBackUrl:
type: string
format: uri
description: >-
Callback URL to receive notifications when the generation
task is completed. Optional configuration, recommended for
production environments.
- After the task is generated, the system will POST task
status and results to this URL
- The callback content includes the generated resource URL
and task-related information
- Your callback endpoint needs to support receiving POST
requests with JSON payloads
- Alternatively, you can call the task details endpoint to
actively poll task status
- To ensure callback security, see [Webhook Verification
Guide](/common-api/webhook-verification) for signature
verification implementation
examples:
- https://your-domain.com/api/callback
input:
type: object
description: Input parameters for the generation task
properties:
prompt:
description: >-
Generation prompt, length must be between 3-5000
characters. (Maximum length: 5000 characters)
type: string
maxLength: 5000
examples:
- >-
A humanoid figure with a vintage television set for a
head, featuring a green-tinted screen displaying a
`Hello FLUX.2` writing in ASCII font. The figure is
wearing a yellow raincoat, and there are various wires
and components attached to the television. The
background is cloudy and indistinct, suggesting an
outdoor setting
aspect_ratio:
type: string
description: >-
Aspect ratio of the generated image. When `auto` is
selected, it will match the ratio of the first input
image (requires input image to be provided).
enum:
- '1:1'
- '4:3'
- '3:4'
- '16:9'
- '9:16'
- '3:2'
- '2:3'
default: '1:1'
examples:
- '1:1'
x-apidog-enum:
- value: '1:1'
name: ''
description: ''
- value: '4:3'
name: ''
description: ''
- value: '3:4'
name: ''
description: ''
- value: '16:9'
name: ''
description: ''
- value: '9:16'
name: ''
description: ''
- value: '3:2'
name: ''
description: ''
- value: '2:3'
name: ''
description: ''
resolution:
description: Output image resolution.
type: string
enum:
- 1K
- 2K
default: 1K
examples:
- 1K
nsfw_checker:
type: boolean
description: >-
Defaults to false. You can set it to false based on your
needs. If set to false, our content filtering will be
disabled, and all results will be returned directly by
the model itself.
Note: There is no guarantee that everything can be
filtered out; if you are not satisfied with the results,
you will need to make your own arrangements.
required:
- prompt
- aspect_ratio
- resolution
x-apidog-orders:
- prompt
- aspect_ratio
- resolution
- 01KWKKN00S0QBA76FQ5GKQ61C6
x-apidog-refs:
01KWKKN00S0QBA76FQ5GKQ61C6:
$ref: '#/components/schemas/nsfw_checker'
x-apidog-ignore-properties:
- nsfw_checker
x-apidog-orders:
- model
- callBackUrl
- input
x-apidog-ignore-properties: []
example:
model: flux-2/flex-text-to-image
callBackUrl: https://your-domain.com/api/callback
input:
prompt: >-
A humanoid figure with a vintage television set for a head,
featuring a green-tinted screen displaying a `Hello FLUX.2`
writing in ASCII font. The figure is wearing a yellow
raincoat, and there are various wires and components attached
to the television. The background is cloudy and indistinct,
suggesting an outdoor setting
aspect_ratio: '1:1'
resolution: 1K
nsfw_checker: false
responses:
'200':
description: Request successful
content:
application/json:
schema:
allOf:
- $ref: '#/components/schemas/ApiResponse'
example:
code: 200
msg: success
data:
taskId: task_flux-2_1765175490366
headers: {}
x-apidog-name: ''
security:
- BearerAuth: []
x-apidog:
schemeGroups:
- id: kn8M4YUlc5i0A0179ezwx
schemeIds:
- BearerAuth
required: true
use:
id: kn8M4YUlc5i0A0179ezwx
scopes:
kn8M4YUlc5i0A0179ezwx:
BearerAuth: []
callbacks:
onImageGenerated:
'{$request.body#/callBackUrl}':
post:
summary: Image Generation Callback
description: >-
When the image generation task is completed, the system sends
the result to your callback URL via a POST request.
requestBody:
required: true
content:
application/json:
schema:
type: object
properties:
code:
type: integer
description: >-
Status code
- **200**: Success - Image generation task completed
successfully
- **400**: Invalid request parameters or content
violates policy
- **500**: Internal error. Please try again later.
- **501**: Failed - Image generation task failed
enum:
- 200
- 400
- 500
- 501
msg:
type: string
description: Status message
example: Playground task completed successfully.
data:
type: object
properties:
completeTime:
type: integer
format: int64
description: >-
Task completion time, represented as a Unix
timestamp in milliseconds
example: 1786430877000
costTime:
type: integer
description: Task duration in seconds
example: 38
createTime:
type: integer
format: int64
description: >-
Task creation time, represented as a Unix
timestamp in milliseconds
example: 1786430837000
creditsConsumed:
type: number
format: double
description: Number of credits consumed by the task
example: 14
model:
type: string
description: Image generation model used for the task
example: flux-2/flex-text-to-image
param:
type: string
description: >-
Parameters submitted when creating the task, in
JSON string format
example: >-
{"input":"{\"aspect_ratio\":\"1:1\",\"prompt\":\"A
humanoid figure with a vintage television set
for a head,featuring a green-tinted screen
displaying a `Hello FLUX.2` writing in ASCII
font. The figure is wearing a yellow raincoat,
and there are various wires and components
attached to the television. The background is
cloudy and indistinct, suggesting an outdoor
setting\",\"resolution\":\"1K\",\"nsfw_checker\":false}","callBackUrl":"https://webhook.uutool.cn/5f723555-ec59-4b8f-8feb-bed810982785","model":"flux-2/flex-text-to-image"}
resultJson:
type: string
description: >-
Image generation result in JSON string format.
resultUrls contains the list of generated image
URLs.
example: >-
{"resultUrls":["https://tempfile.aiquickdraw.com/h/97d494e87bb500bbfd9ae018b9df5e50_1786430874.png"]}
state:
type: string
description: Task status
enum:
- success
- fail
example: success
taskId:
type: string
description: Task ID
example: 97d494e87bb500bbfd9ae018b9df5e50
updateTime:
type: integer
format: int64
description: >-
Last task update time, represented as a Unix
timestamp in milliseconds
example: 1786430877000
responses:
'200':
description: Callback received successfully
x-apidog-folder: docs/en/Market/Image Models/Flux-2
x-apidog-status: released
x-run-in-apidog: https://app.apidog.com/web/project/1184766/apis/api-28506367-run
components:
schemas:
nsfw_checker:
type: object
properties:
nsfw_checker:
type: boolean
description: >-
Defaults to false. You can set it to false based on your needs. If
set to false, our content filtering will be disabled, and all
results will be returned directly by the model itself.
Note: There is no guarantee that everything can be filtered out; if
you are not satisfied with the results, you will need to make your
own arrangements.
x-apidog-orders:
- nsfw_checker
x-apidog-ignore-properties: []
x-apidog-folder: ''
ApiResponse:
type: object
properties:
code:
type: integer
description: >-
Response status code
- **200**: Success - Request has been processed successfully
- **401**: Unauthorized - Authentication credentials are missing or
invalid
- **402**: Insufficient Credits - Account does not have enough
credits to perform the operation
- **404**: Not Found - The requested resource or endpoint does not
exist
- **422**: Validation Error - The request parameters failed
validation checks
- **429**: Rate Limited - Request limit has been exceeded for this
resource
- **433**: Request Limit - Sub-key Usage Exceeds Limit
- **455**: Service Unavailable - System is currently undergoing
maintenance
- **500**: Server Error - An unexpected error occurred while
processing the request
- **501**: Generation Failed - Content generation task failed
- **505**: Feature Disabled - The requested feature is currently
disabled
enum:
- 200
- 401
- 402
- 404
- 422
- 429
- 433
- 455
- 500
- 501
- 505
x-apidog-enum:
- value: 200
name: ''
description: ''
- value: 401
name: ''
description: ''
- value: 402
name: ''
description: ''
- value: 404
name: ''
description: ''
- value: 422
name: ''
description: ''
- value: 429
name: ''
description: ''
- value: 433
name: ''
description: ''
- value: 455
name: ''
description: ''
- value: 500
name: ''
description: ''
- value: 501
name: ''
description: ''
- value: 505
name: ''
description: ''
msg:
type: string
description: Response message, error description when failed
examples:
- success
data:
type: object
properties:
taskId:
type: string
description: >-
Task ID, can be used with Get Task Details endpoint to query
task status
x-apidog-orders:
- taskId
required:
- taskId
x-apidog-ignore-properties: []
x-apidog-orders:
- code
- msg
- data
title: response not with recordId
required:
- data
x-apidog-ignore-properties: []
x-apidog-folder: ''
securitySchemes:
BearerAuth:
type: bearer
scheme: bearer
bearerFormat: API Key
description: >-
All API requests require a Bearer Token. Add the header `Authorization:
Bearer YOUR_API_KEY` to authenticate requests.
BearerAuth1:
type: bearer
scheme: bearer
bearerFormat: API Key
description: >-
所有 API 请求都需要 Bearer Token。请在请求头中添加 `Authorization: Bearer YOUR_API_KEY`
进行身份验证。
servers:
- url: https://api.kie.ai
description: 正式环境
security:
- BearerAuth: []
x-apidog:
schemeGroups:
- id: kn8M4YUlc5i0A0179ezwx
schemeIds:
- BearerAuth
required: true
use:
id: kn8M4YUlc5i0A0179ezwx
scopes:
kn8M4YUlc5i0A0179ezwx:
BearerAuth: []
```