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OpenAI TTS produces natural, expressive speech from text using neural voice synthesis. It supports multiple distinct voices and is available in standard and HD quality tiers.

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Getting Started

Follow these steps to configure your provider:
1

Add OpenAI credentials to your vault

Navigate to Integration → Vault in the Rapida dashboard and add your OpenAI API key. This credential is shared across all OpenAI services (LLM, Whisper STT, and TTS).
2

Select OpenAI as your TTS provider

When configuring your assistant, open Audio Settings and choose OpenAI as your Text-to-Speech provider.
3

Choose a voice

Select from the available voices to match your assistant’s persona.

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Available Voices

VoiceCharacter
alloyNeutral, balanced
echoMale, clear
fableExpressive, narrative
onyxDeep, authoritative
novaWarm, natural
shimmerClear, bright

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Supported Models

ModelDescription
tts-1Optimized for real-time, low-latency synthesis
tts-1-hdHigher quality, best for offline or non-real-time use
For real-time voice assistants, use tts-1 to minimize latency.

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Configuration Options

OptionDescriptionDefault
Modeltts-1 or tts-1-hdtts-1
VoiceOne of the six voices abovealloy
SpeedPlayback speed multiplier (0.25–4.0)1.0
FormatOutput format: mp3, opus, aac, flac, wav, pcmpcm

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Notes

  • Use tts-1 for real-time conversations; tts-1-hd adds perceptible latency.
  • Audio is streamed in chunks, so playback begins before synthesis is fully complete.
  • Pricing is per 1,000 characters of input text. See OpenAI TTS pricing.