VideoGen Text API

openapi: 3.2.0
info:
  title: VideoGen Text API
  version: 1.0.0
  description: Programmatically generate images, videos, voiceovers, sound effects, and avatar clips.
servers:
- url: https://api.videogen.io
  description: Production
security:
- bearerAuth: []
tags:
- name: Text
  description: Generate text with a general-purpose language model. Synchronous — the response includes the generated text.
paths:
  /v1/text/generate:
    post:
      tags:
      - Text
      operationId: generateText
      x-fern-audiences:
      - rest
      summary: Generate text
      description: 'Generate text from a prompt using a general-purpose language model. Choose a quality tier with `quality` (`LOW`, `STANDARD`, `HIGH`, or `MAX`). Synchronous: the response includes the generated text. Useful for drafting scripts, titles, descriptions, and other short copy before generating a video.'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/GenerateTextRequest'
      responses:
        '200':
          description: Generated text.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GenerateTextResponse'
        default:
          description: Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiError'
components:
  schemas:
    GenerateTextRequest:
      type: object
      required:
      - prompt
      properties:
        prompt:
          type: string
          example: Write a 30-second upbeat video script about why the sky is blue.
          description: The instruction or content to generate text from.
        system:
          type:
          - string
          - 'null'
          description: Optional system instructions that steer the model's role, tone, and constraints.
        quality:
          $ref: '#/components/schemas/ModelQuality'
          description: Text generation quality tier. Optional; when omitted, your account's Default AI quality for text is used (change it at https://app.videogen.io/settings/account).
        temperature:
          type: number
          minimum: 0
          maximum: 2
          description: Sampling temperature. Higher values produce more varied output. Defaults to the model's default.
        maxOutputTokens:
          type: integer
          minimum: 1
          maximum: 2000
          default: 512
          description: Maximum number of tokens to generate. Defaults to 512.
    ApiError:
      type: object
      description: 'Standard error body returned with every non-2xx response (the `default` response of every operation). The HTTP status code conveys the error class; this body carries the details:


        - `400` invalid request, `401` missing or invalid API key, `403` not permitted (e.g. plan or add-on required, see `requirement`), `404` not found, `409` conflict, `429` rate limited or out of credits, `5xx` server error.


        Common `code` values include `invalid_request`, `invalid_api_key`, `not_authorized`, `not_found`, `insufficient_credits`, and `rate_limited`. Always branch on `code` (and `requirement.type` when present) rather than parsing `message`.

        '
      required:
      - message
      properties:
        message:
          type: string
          description: Human-readable error description. For display and logging only; do not branch on its exact text.
        code:
          type:
          - string
          - 'null'
          description: Machine-readable error code in snake_case (e.g. `invalid_api_key`, `insufficient_credits`). `null` when no specific code applies.
        requirement:
          description: What is needed to resolve the error. Present when the error can be fixed by fulfilling a specific requirement (e.g. purchasing an add-on); `null` otherwise.
          anyOf:
          - $ref: '#/components/schemas/ErrorRequirement'
          - type: 'null'
        internalErrorCode:
          type:
          - string
          - 'null'
          description: Opaque internal error code for debugging. Include this when contacting support. `null` when not applicable.
    ErrorRequirement:
      type: object
      description: What is needed to resolve an error, when it can be fixed by fulfilling a specific requirement (e.g. purchasing an add-on or upgrading the plan).
      required:
      - type
      properties:
        type:
          type: string
          description: Machine-readable requirement type in snake_case (e.g. `purchase_add_on`, `upgrade_plan`).
        details:
          type: object
          additionalProperties:
            type: string
          description: Key-value pairs with requirement-specific context (e.g. the add-on id to purchase).
    GenerateTextResponse:
      type: object
      required:
      - text
      properties:
        text:
          type: string
          description: The generated text.
    ModelQuality:
      type: string
      enum:
      - LOW
      - STANDARD
      - HIGH
      - MAX
      description: 'AI generation quality tier, shared across every generative feature (image, video, text, and so on). `LOW` is fastest and cheapest, `STANDARD` balances quality and cost, `HIGH` is higher quality, and `MAX` is the highest quality.


        When a request omits the quality field, VideoGen falls back to your account''s **Default AI quality** for that feature, which you can change at [Account settings](https://app.videogen.io/settings/account). Not every feature supports every tier; unsupported tiers are rejected with an error (see each field''s description).

        '
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: opaque
      description: API key from [app.videogen.io/api](https://app.videogen.io/api). The full key is only shown once when you create it.
x-provenance:
  method: harvested
  publisher: VideoGen
  source: https://api.videogen.io/openapi.json
  note: split by refine-openapis from the provider's own published document, verified by fetch (openapi/_original/*.fetch.json);
    stamped by stamp-openapi-provenance.py (roadmap#793)