Create Speech Node

The Create Speech node converts text to speech audio using OpenAI's TTS (text-to-speech) models.

Description

The Create Speech node generates audio from text using OpenAI's text-to-speech models. It supports multiple voices and output formats.

Execution Inputs

• Execute (execution): Triggers the speech generation request

Variable Inputs

• Model (string): The TTS model to use. Must be "tts-1" or "tts-1-hd" (default: "tts-1")
• Voice (string): The voice to use. Must be one of: "alloy", "echo", "fable", "onyx", "nova", "shimmer" (default: "alloy")
• Input (string): The text to convert to speech
• ResponseFormat (string, optional): Audio format. Must be "mp3", "opus", "aac", or "flac" (default: "mp3")
• Speed (float, optional): Speed of the generated speech. Must be between 0.25 and 4.0 (default: 1.0)

Execution Outputs

• Success (execution): Execution continues here if the request succeeded
• Failed (execution): Execution continues here if the request failed

Variable Outputs

• Response (string): Full JSON response from the API
• AudioData (string): Base64-encoded audio data
• AudioSize (integer): Size of the audio data in bytes
• ErrorMessage (string): Error message if request failed

Special Notes

• Requires a valid API key configured via Set API Key node
• Maximum input text length is 4096 characters
• Audio data is returned as base64-encoded string
• Use Save Speech To File node to save the audio to disk
• "tts-1-hd" provides higher quality but is slower
• Speed values below 1.0 slow down speech, above 1.0 speed it up

Example Usage

Generate speech from text:

1. Set Model to "tts-1"
2. Set Voice to "nova"
3. Set Input to "Hello, this is a test of text-to-speech."
4. Set ResponseFormat to "mp3"
5. Connect Execute to generate
6. Use AudioData output with Save Speech To File node to save

Flow Download Example

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Additional Pictures

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