Black Forest Labs

Black Forest Labs Generation API

Image generation endpoints.

GitHub OpenAPI

Operations 6

POST /v1/flux-pro-1.1 FLUX 1.1 [pro] generation #
POST /v1/flux-pro-1.1-ultra FLUX 1.1 [pro] Ultra generation #
POST /v1/flux-dev FLUX.1 [dev] generation #
POST /v1/flux-2-pro FLUX.2 [PRO] generation #
POST /v1/flux-2-flex FLUX.2 [FLEX] generation #
POST /v1/flux-2-max FLUX.2 [MAX] generation #

Specifications

⚙
OpenAPI
https://raw.githubusercontent.com/api-evangelist/black-forest-labs/refs/heads/main/openapi/black-forest-labs-generation-api-openapi.yml

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OpenAPI Specification

black-forest-labs-generation-api-openapi.yml Raw ↑ 
openapi: 3.2.0
info:
  title: Black Forest Labs FLUX Editing Generation API
  description: 'Asynchronous image generation API from Black Forest Labs. Submit a

    generation request to a model-specific endpoint and poll

    `/v1/get_result` (or use the optional webhook callback) for the

    finished image. Includes the FLUX, FLUX.1, and FLUX.2 model families,

    Fill/Expand image editing tools, credit lookup, and fine-tune

    management.

    '
  version: '1.0'
  contact:
    name: Black Forest Labs
    url: https://docs.bfl.ai
servers:
- url: https://api.bfl.ai
  description: Global
- url: https://api.us.bfl.ai
  description: United States region
- url: https://api.eu.bfl.ai
  description: European region (GDPR)
security:
- apiKey: []
tags:
- name: Generation
  description: Image generation endpoints.
paths:
  /v1/flux-pro-1.1:
    post:
      tags:
      - Generation
      summary: FLUX 1.1 [pro] generation
      operationId: generateFluxPro11
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/GenerationRequest'
      responses:
        '200':
          $ref: '#/components/responses/AsyncResponse'
        '422':
          $ref: '#/components/responses/ValidationError'
  /v1/flux-pro-1.1-ultra:
    post:
      tags:
      - Generation
      summary: FLUX 1.1 [pro] Ultra generation
      operationId: generateFluxPro11Ultra
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/GenerationRequest'
      responses:
        '200':
          $ref: '#/components/responses/AsyncResponse'
        '422':
          $ref: '#/components/responses/ValidationError'
  /v1/flux-dev:
    post:
      tags:
      - Generation
      summary: FLUX.1 [dev] generation
      operationId: generateFluxDev
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/GenerationRequest'
      responses:
        '200':
          $ref: '#/components/responses/AsyncResponse'
        '422':
          $ref: '#/components/responses/ValidationError'
  /v1/flux-2-pro:
    post:
      tags:
      - Generation
      summary: FLUX.2 [PRO] generation
      operationId: generateFlux2Pro
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/GenerationRequest'
      responses:
        '200':
          $ref: '#/components/responses/AsyncResponse'
        '422':
          $ref: '#/components/responses/ValidationError'
  /v1/flux-2-flex:
    post:
      tags:
      - Generation
      summary: FLUX.2 [FLEX] generation
      operationId: generateFlux2Flex
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/GenerationRequest'
      responses:
        '200':
          $ref: '#/components/responses/AsyncResponse'
  /v1/flux-2-max:
    post:
      tags:
      - Generation
      summary: FLUX.2 [MAX] generation
      operationId: generateFlux2Max
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/GenerationRequest'
      responses:
        '200':
          $ref: '#/components/responses/AsyncResponse'
components:
  schemas:
    AsyncResponse:
      type: object
      properties:
        id:
          type: string
        polling_url:
          type: string
          format: uri
    GenerationRequest:
      type: object
      properties:
        prompt:
          type: string
        width:
          type: integer
        height:
          type: integer
        aspect_ratio:
          type: string
          example: '16:9'
        seed:
          type: integer
        prompt_upsampling:
          type: boolean
          default: false
        safety_tolerance:
          type: integer
          minimum: 0
          maximum: 6
        output_format:
          type: string
          enum:
          - jpeg
          - png
          - webp
        webhook_url:
          type: string
          format: uri
        webhook_secret:
          type: string
    HTTPValidationError:
      type: object
      properties:
        detail:
          type: array
          items:
            type: object
            properties:
              loc:
                type: array
                items:
                  oneOf:
                  - type: string
                  - type: integer
              msg:
                type: string
              type:
                type: string
  responses:
    AsyncResponse:
      description: Generation task queued.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/AsyncResponse'
    ValidationError:
      description: Request validation failed.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/HTTPValidationError'
  securitySchemes:
    apiKey:
      type: apiKey
      in: header
      name: x-key
      description: BFL API key.