> ## Documentation Index
> Fetch the complete documentation index at: https://gomodel-docs-benchmark-writeup-and-tooling.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Create speech (text-to-speech)



## OpenAPI

````yaml /openapi.json post /v1/audio/speech
openapi: 3.0.0
info:
  description: >-
    AI gateway routing requests to multiple LLM providers (OpenAI, Anthropic,
    Gemini, Groq, OpenRouter, DeepSeek, Z.ai, xAI, MiniMax, Xiaomi MiMo,
    OpenCode Go, Oracle, Ollama, Bailian). Drop-in OpenAI-compatible API.
  title: GoModel API
  contact: {}
  version: '1.0'
servers:
  - url: '{base_url}'
    description: Edit the base URL to point at your GoModel deployment.
    variables:
      base_url:
        default: http://localhost:8080
        description: Your GoModel deployment URL
security: []
paths:
  /v1/audio/speech:
    post:
      tags:
        - audio
      summary: Create speech (text-to-speech)
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/core.AudioSpeechRequest'
        description: Text-to-speech request
        required: true
      responses:
        '200':
          description: Binary audio in the requested response_format
          content:
            application/octet-stream:
              schema:
                type: string
                format: binary
        '400':
          description: Bad Request
          content:
            application/octet-stream:
              schema:
                $ref: '#/components/schemas/core.OpenAIErrorEnvelope'
        '401':
          description: Unauthorized
          content:
            application/octet-stream:
              schema:
                $ref: '#/components/schemas/core.OpenAIErrorEnvelope'
        '404':
          description: Not Found
          content:
            application/octet-stream:
              schema:
                $ref: '#/components/schemas/core.OpenAIErrorEnvelope'
        '502':
          description: Bad Gateway
          content:
            application/octet-stream:
              schema:
                $ref: '#/components/schemas/core.OpenAIErrorEnvelope'
      security:
        - BearerAuth: []
components:
  schemas:
    core.AudioSpeechRequest:
      type: object
      properties:
        input:
          type: string
        instructions:
          type: string
        model:
          type: string
        provider:
          description: >-
            Provider is gateway routing metadata, stripped before dispatching
            upstream.
          type: string
        response_format:
          type: string
        speed:
          type: number
        voice:
          type: string
      required:
        - input
        - model
        - voice
    core.OpenAIErrorEnvelope:
      type: object
      required:
        - error
      properties:
        error:
          $ref: '#/components/schemas/core.OpenAIErrorObject'
    core.OpenAIErrorObject:
      type: object
      required:
        - code
        - message
        - param
        - type
      properties:
        code:
          type: string
          nullable: true
        message:
          type: string
        param:
          type: string
          nullable: true
        type:
          $ref: '#/components/schemas/core.ErrorType'
    core.ErrorType:
      type: string
      enum:
        - provider_error
        - rate_limit_error
        - invalid_request_error
        - authentication_error
        - not_found_error
      x-enum-varnames:
        - ErrorTypeProvider
        - ErrorTypeRateLimit
        - ErrorTypeInvalidRequest
        - ErrorTypeAuthentication
        - ErrorTypeNotFound
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT

````