Runway Image Generation API

openapi: 3.1.0
info:
  title: Runway Image Generation API
  description: >-
    The Runway Image Generation API provides a text-to-image endpoint that
    enables developers to generate high-quality images from text prompts using
    Runway's Gen-4 Image model. The API accepts text descriptions and produces
    images as output, allowing integration of AI-powered image generation into
    applications, products, and platforms. Like the video API, it uses
    asynchronous task processing and Bearer token authentication.
  version: '2024-11-06'
  contact:
    name: Runway Support
    url: https://support.runwayml.com/
  termsOfService: https://runwayml.com/terms-of-use
externalDocs:
  description: Runway API Documentation
  url: https://docs.dev.runwayml.com/api/
servers:
  - url: https://api.dev.runwayml.com/v1
    description: Production Server
tags:
  - name: Tasks
    description: >-
      Retrieve status and output of asynchronous generation tasks.
  - name: Text to Image
    description: >-
      Generate high-quality images from text prompts using the Gen-4 Image model.
security:
  - bearerAuth: []
paths:
  /text_to_image:
    post:
      operationId: createTextToImage
      summary: Create text-to-image generation task
      description: >-
        Starts a new asynchronous task to generate an image from a text prompt
        using the Gen-4 Image model. The prompt describes what should appear in
        the generated image. Returns a task ID that can be polled for completion.
      tags:
        - Text to Image
      parameters:
        - $ref: '#/components/parameters/RunwayVersion'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TextToImageRequest'
      responses:
        '200':
          description: Task created successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TaskCreatedResponse'
        '400':
          description: Bad request - invalid parameters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized - invalid or missing API key
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: Rate limit exceeded
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /tasks/{id}:
    get:
      operationId: getTask
      summary: Retrieve task status and output
      description: >-
        Retrieves the current status and output of an asynchronous image
        generation task by its unique identifier. Poll this endpoint until the
        task status indicates completion. When a task succeeds, the response
        includes output URLs linking to the generated image.
      tags:
        - Tasks
      parameters:
        - $ref: '#/components/parameters/RunwayVersion'
        - $ref: '#/components/parameters/TaskId'
      responses:
        '200':
          description: Task status retrieved successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TaskResponse'
        '401':
          description: Unauthorized - invalid or missing API key
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: Task not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: >-
        API key passed via the HTTP Authorization header using the Bearer scheme.
        Obtain your API key from the Runway Developer Portal at
        https://dev.runwayml.com/.
  parameters:
    RunwayVersion:
      name: X-Runway-Version
      in: header
      required: true
      description: >-
        API version identifier. Must be set to the exact value 2024-11-06.
      schema:
        type: string
        enum:
          - '2024-11-06'
    TaskId:
      name: id
      in: path
      required: true
      description: >-
        The unique identifier of the task, returned when the task was created.
      schema:
        type: string
        format: uuid
  schemas:
    TextToImageRequest:
      type: object
      required:
        - model
        - promptText
      properties:
        model:
          type: string
          description: >-
            The model to use for image generation. Currently supports the
            gen4_image model.
          enum:
            - gen4_image
        promptText:
          type: string
          description: >-
            A text description of up to 1000 characters that describes in detail
            what should appear in the generated output image.
          maxLength: 1000
        ratio:
          type: string
          description: >-
            The aspect ratio of the output image. Supported landscape ratios
            include 1280:720, 1584:672, 1104:832. Portrait ratios include
            720:1280, 832:1104. Square ratio is 960:960.
          enum:
            - '1280:720'
            - '1584:672'
            - '1104:832'
            - '720:1280'
            - '832:1104'
            - '960:960'
    TaskCreatedResponse:
      type: object
      properties:
        id:
          type: string
          format: uuid
          description: >-
            The unique identifier for the created task. Use this ID to poll
            the task status endpoint.
    TaskResponse:
      type: object
      properties:
        id:
          type: string
          format: uuid
          description: >-
            The unique identifier of the task.
        status:
          type: string
          description: >-
            The current status of the task.
          enum:
            - PENDING
            - PROCESSING
            - SUCCEEDED
            - FAILED
            - CANCELLED
        createdAt:
          type: string
          format: date-time
          description: >-
            The timestamp when the task was created.
        output:
          type: array
          description: >-
            One or more URLs linking to the generated output image. Only present
            when the task status is SUCCEEDED.
          items:
            type: string
            format: uri
        failure:
          type: string
          description: >-
            A description of the failure reason. Only present when the task
            status is FAILED.
    ErrorResponse:
      type: object
      properties:
        error:
          type: string
          description: >-
            A human-readable error message describing what went wrong.
        code:
          type: string
          description: >-
            A machine-readable error code identifying the type of error.