Stability AI Generate Core API

openapi: 3.2.0
info:
  title: Stability AI Stable Image Generate Generate Core API
  description: The Stability AI Stable Image Generate API provides text-to-image generation capabilities powered by models including Stable Diffusion 3.5 and Stable Image Ultra. Developers can generate high-quality images from text prompts with control over style, dimensions, and output format. The API supports multiple model tiers including Stable Image Core for fast and affordable generation and Stable Image Ultra for state-of-the-art quality results.
  version: v2beta
  contact:
    name: Stability AI Support
    url: https://platform.stability.ai
  termsOfService: https://stability.ai/terms-of-service
servers:
- url: https://api.stability.ai
  description: Production Server
security:
- bearerAuth: []
tags:
- name: Generate Core
  description: Generate images using Stable Image Core, a fast and affordable model for high-quality image generation.
paths:
  /v2beta/stable-image/generate/core:
    post:
      operationId: generateImageCore
      summary: Generate an image using Stable Image Core
      description: Generates an image from a text prompt using the Stable Image Core model. This endpoint provides fast and affordable generation with high-quality results suitable for most use cases. Requests use multipart form data encoding.
      tags:
      - Generate Core
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              $ref: '#/components/schemas/GenerateCoreRequest'
      responses:
        '200':
          description: Successfully generated image
          content:
            image/jpeg:
              schema:
                type: string
                format: binary
            image/png:
              schema:
                type: string
                format: binary
            image/webp:
              schema:
                type: string
                format: binary
            application/json:
              schema:
                $ref: '#/components/schemas/GenerateImageResponse'
        '400':
          description: Bad request due to invalid parameters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized due to missing or invalid API key
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: Forbidden due to content moderation or insufficient permissions
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: Rate limit exceeded
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  schemas:
    GenerateImageResponse:
      type: object
      properties:
        image:
          type: string
          description: Base64-encoded image data when Accept header is set to application/json.
        finish_reason:
          type: string
          enum:
          - SUCCESS
          - CONTENT_FILTERED
          description: The reason the generation finished. SUCCESS indicates a successful generation, CONTENT_FILTERED indicates the output was blocked by content moderation.
        seed:
          type: integer
          description: The seed used for generation. Useful for reproducing results.
    GenerateCoreRequest:
      type: object
      required:
      - prompt
      properties:
        prompt:
          type: string
          maxLength: 10000
          description: Text describing what you wish to see in the output image.
        negative_prompt:
          type: string
          maxLength: 10000
          description: Text describing elements to exclude from the output image.
        aspect_ratio:
          type: string
          enum:
          - '16:9'
          - '1:1'
          - '21:9'
          - '2:3'
          - '3:2'
          - '4:5'
          - '5:4'
          - '9:16'
          - '9:21'
          default: '1:1'
          description: Controls the aspect ratio of the generated image.
        seed:
          type: integer
          minimum: 0
          maximum: 4294967294
          default: 0
          description: A value to control randomness in generation.
        output_format:
          type: string
          enum:
          - jpeg
          - png
          - webp
          default: png
          description: The output format of the generated image.
        style_preset:
          type: string
          description: An optional style preset to guide the image model towards a particular visual style.
    ErrorResponse:
      type: object
      properties:
        id:
          type: string
          description: A unique identifier for the error instance.
        name:
          type: string
          description: The error type name.
        message:
          type: string
          description: A human-readable description of the error.
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: API key authentication. Pass your Stability AI API key as a Bearer token in the Authorization header.
externalDocs:
  description: Stability AI API Documentation
  url: https://platform.stability.ai/docs/api-reference