Generate speech (OpenAI)

Node catalog Artificial intelligence

On this page

Turn text into speech using an OpenAI credential.

Usage and specifics

Select an OpenAI credential and a model suitable for transcription or speech synthesis. Supply the required audio or text and preserve output format and MIME type.

Technical type : generate_speech_openai. Runtime : nodulz.

Credentials and prerequisites

Create and configure the credential : openai

Create credentials in your nodulz instance’s Credentials area, then select them on the node. Availability depends on ownership and sharing. See the credentials guide for access and rotation.

Parameters

Names below are technical keys. Defaults are not a ready-to-run configuration: complete fields required by your operation. Paths containing [] describe list items; some fields depend on the selected mode.

Parameter	Type	Default	Values / limits
`credentialId`	`string`	`""`	-
`timeoutSeconds`	`number`	`120`	-; ≥ 1, ≤ 3600
`text`	`string`	`""`	-
`model`	`string`	`"gpt-4o-mini-tts"`	-; min 1
`voice`	`enum`	`"coral"`	`alloy`, `ash`, `ballad`, `coral`, `echo`, `fable`, `nova`, `onyx`, `sage`, `shimmer`, `verse`, `marin`, `cedar`
`format`	`enum`	`"mp3"`	`mp3`, `wav`, `flac`
`speed`	`number`	`1`	-; ≥ 0.25, ≤ 4
`instructions`	`string`	`""`	-

Configuration help

credentialId AI credential: OpenAI API credential accessible to the workflow owner. The provider bills API requests.
model Model: Transcription: choose whisper-1 for Whisper, gpt-4o-mini-transcribe (default), or gpt-4o-transcribe. You can also enter another model ID. Speech: gpt-4o-mini-tts by default.

Initial configuration

Initial catalog configuration example, to adapt before running. Keep secrets in credentials.

json

{
  "credentialId": "",
  "timeoutSeconds": 120,
  "text": "",
  "model": "gpt-4o-mini-tts",
  "voice": "coral",
  "format": "mp3",
  "speed": 1,
  "instructions": ""
}

Verification

Test with representative data. Check node output in the inspector and logs, then use editor mapping for downstream fields. A trigger test with a simulated payload does not validate external service delivery.