RunAPI Flux Kontext API
The Flux Kontext API from RunAPI — 2 operation(s) for flux kontext.
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OpenAPI Specification
openapi: 3.2.0
info:
title: RunAPI Flux Kontext API
version: v1
description: Create and retrieve AI media tasks, or use compatible LLM protocol endpoints.
servers:
- url: https://runapi.ai
security:
- bearerAuth: []
tags:
- name: Flux Kontext
paths:
/api/v1/flux_kontext/text_to_image:
post:
tags:
- Flux Kontext
summary: Flux Kontext Text-to-Image
description: Create an asynchronous task through the Flux Kontext text to image endpoint.
operationId: task_endpoint_flux_kontext_text_to_image
security:
- bearerAuth: []
requestBody:
required: true
content:
application/json:
schema:
oneOf:
- type: object
properties:
model:
type: string
description: Model slug.
const: flux-kontext-max
prompt:
type: string
description: Image description (English only).
aspect_ratio:
type: string
enum:
- '21:9'
- '16:9'
- '4:3'
- '1:1'
- '3:4'
- '9:16'
description: 'Output aspect ratio. Default: 16:9.'
output_format:
type: string
enum:
- jpeg
- png
description: 'Output format. Default: jpeg.'
source_image_url:
type: string
description: Source image URL for editing mode.
enable_translation:
type: boolean
description: 'Auto-translate non-English prompts. Default: true.'
enable_prompt_expansion:
type: boolean
description: 'Expand the prompt with more detail. Default: false.'
safety_tolerance:
type: integer
description: 'Content safety threshold. 0-6 for generation, 0-2 for editing. Default: 2.'
callback_url:
type: string
description: Webhook URL for async notifications.
watermark:
type: string
description: Watermark identifier.
additionalProperties: false
required:
- model
- prompt
- type: object
properties:
model:
type: string
description: Model slug.
const: flux-kontext-pro
prompt:
type: string
description: Image description (English only).
aspect_ratio:
type: string
enum:
- '21:9'
- '16:9'
- '4:3'
- '1:1'
- '3:4'
- '9:16'
description: 'Output aspect ratio. Default: 16:9.'
output_format:
type: string
enum:
- jpeg
- png
description: 'Output format. Default: jpeg.'
source_image_url:
type: string
description: Source image URL for editing mode.
enable_translation:
type: boolean
description: 'Auto-translate non-English prompts. Default: true.'
enable_prompt_expansion:
type: boolean
description: 'Expand the prompt with more detail. Default: false.'
safety_tolerance:
type: integer
description: 'Content safety threshold. 0-6 for generation, 0-2 for editing. Default: 2.'
callback_url:
type: string
description: Webhook URL for async notifications.
watermark:
type: string
description: Watermark identifier.
additionalProperties: false
required:
- model
- prompt
responses:
'202':
description: Create acceptance
content:
application/json:
schema:
type: object
required:
- id
- status
properties:
id:
type: string
status:
type: string
enum:
- processing
task_replayed:
type: boolean
unevaluatedProperties: false
'400':
description: Invalid request
content:
application/json:
schema:
oneOf:
- type: object
required:
- error
properties:
error:
type: string
description: Human-readable error message.
unevaluatedProperties: false
- type: object
required:
- error
- errors
properties:
error:
type: string
description: Human-readable validation summary.
errors:
type: object
description: Validation messages keyed by public request field, with an array of human-readable strings for each field.
additionalProperties:
type: array
items:
type: string
unevaluatedProperties: false
'401':
description: Authentication required
content:
application/json:
schema:
type: object
required:
- error
properties:
error:
type: string
description: Human-readable error message.
unevaluatedProperties: false
'402':
description: Insufficient balance
content:
application/json:
schema:
type: object
required:
- error
properties:
error:
type: string
description: Human-readable error message.
unevaluatedProperties: false
'409':
description: Request conflict
content:
application/json:
schema:
type: object
required:
- error
properties:
error:
type: string
description: Human-readable error message.
unevaluatedProperties: false
'429':
description: Api token credit limit exceeded or Rate limited
content:
application/json:
schema:
type: object
required:
- error
properties:
error:
type: string
description: Human-readable error message.
unevaluatedProperties: false
'503':
description: Service unavailable
content:
application/json:
schema:
type: object
required:
- error
properties:
error:
type: string
description: Human-readable error message.
unevaluatedProperties: false
'504':
description: Timeout error
content:
application/json:
schema:
type: object
required:
- error
properties:
error:
type: string
description: Human-readable error message.
unevaluatedProperties: false
/api/v1/flux_kontext/text_to_image/{id}:
get:
tags:
- Flux Kontext
summary: Retrieve Flux Kontext Text-to-Image task
description: Create an asynchronous task through the Flux Kontext text to image endpoint.
operationId: task_endpoint_flux_kontext_text_to_image_retrieve
security:
- bearerAuth: []
parameters:
- name: id
in: path
required: true
schema:
type: string
responses:
'200':
description: Polling processing or Polling completed or Polling failed
content:
application/json:
schema:
oneOf:
- type: object
required:
- id
- status
properties:
id:
type: string
status:
type: string
enum:
- processing
unevaluatedProperties: false
- type: object
required:
- id
- status
- images
- usage
properties:
id:
type: string
status:
type: string
enum:
- completed
images:
type: array
items:
type: object
required:
- url
properties:
url:
type: string
x-runapi-generated-media: true
origin_url:
type: string
unevaluatedProperties: false
usage:
type: object
properties:
cost:
type: number
unevaluatedProperties: false
unevaluatedProperties: false
- type: object
required:
- id
- status
- error
properties:
id:
type: string
status:
type: string
enum:
- failed
error:
type: string
unevaluatedProperties: false
'401':
description: Polling authentication required
content:
application/json:
schema:
type: object
required:
- error
properties:
error:
type: string
description: Human-readable error message.
unevaluatedProperties: false
'404':
description: Task not found
content:
application/json:
schema:
type: object
required:
- error
properties:
error:
type: string
description: Human-readable error message.
unevaluatedProperties: false
components:
securitySchemes:
bearerAuth:
type: http
scheme: bearer
bearerFormat: API token