> ## Documentation Index
> Fetch the complete documentation index at: https://doc.rapida.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# OpenAI TTS

> OpenAI Text-to-Speech delivers natural-sounding speech synthesis with multiple high-quality voices.

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.

## Getting Started

Follow these steps to configure your provider:

<Steps>
  <Step title="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).
  </Step>

  <Step title="Select OpenAI as your TTS provider">
    When configuring your assistant, open **Audio Settings** and choose **OpenAI** as your Text-to-Speech provider.
  </Step>

  <Step title="Choose a voice">
    Select from the available voices to match your assistant's persona.
  </Step>
</Steps>

## Available Voices

| Voice     | Character             |
| --------- | --------------------- |
| `alloy`   | Neutral, balanced     |
| `echo`    | Male, clear           |
| `fable`   | Expressive, narrative |
| `onyx`    | Deep, authoritative   |
| `nova`    | Warm, natural         |
| `shimmer` | Clear, bright         |

## Supported Models

| Model      | Description                                           |
| ---------- | ----------------------------------------------------- |
| `tts-1`    | Optimized for real-time, low-latency synthesis        |
| `tts-1-hd` | Higher quality, best for offline or non-real-time use |

For real-time voice assistants, use `tts-1` to minimize latency.

## Configuration Options

| Option | Description                                               | Default |
| ------ | --------------------------------------------------------- | ------- |
| Model  | `tts-1` or `tts-1-hd`                                     | `tts-1` |
| Voice  | One of the six voices above                               | `alloy` |
| Speed  | Playback speed multiplier (0.25–4.0)                      | `1.0`   |
| Format | Output format: `mp3`, `opus`, `aac`, `flac`, `wav`, `pcm` | `pcm`   |

## 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](https://openai.com/pricing).

## Related

* [OpenAI Whisper STT](/integrations/stt/openai-whisper)
* [OpenAI LLM](/integrations/llm/openai)
* [ElevenLabs TTS](/integrations/tts/elevenlabs)