# xAI (/en/ai/models/tts/xai)

> For AI agents: see the complete documentation index at [llms.txt](/llms.txt).

xAI provides text-to-speech (TTS) with a range of expressive voices for conversational AI applications.

<CalloutContainer type="info">
  <CalloutTitle>
    Info
  </CalloutTitle>

  <CalloutDescription>
    This integration is fully supported for use with Conversational AI Engine. While it has completed functional validation, it is newer to the platform, and additional provider-specific edge cases may be identified as usage scales across a broader range of applications and workloads.
  </CalloutDescription>
</CalloutContainer>

### Sample configuration [#sample-configuration]

The following example shows a starting `tts` parameter configuration you can use when you [Start a conversational AI agent](/en/api-reference/api-ref/conversational-ai/join).

```json
"tts": {
  "vendor": "xai",
  "params": {
    "api_key": "${env:XAI_API_KEY}",
    "voice_id": "eve",
    "language": "en",
    "sample_rate": 16000
  }
}
```

<CalloutContainer type="warning">
  <CalloutTitle>
    Caution
  </CalloutTitle>

  <CalloutDescription>
    The parameters listed on this page are validated for use with Conversational AI Engine. Required parameters must be provided as documented. Any additional parameters are passed through directly to the underlying vendor without validation. For a full list of supported options, refer to the [xAI Text to Speech documentation](https://docs.x.ai/developers/model-capabilities/audio/text-to-speech).
  </CalloutDescription>
</CalloutContainer>

### Key parameters [#key-parameters]

<ParameterList title="params" required="true">
  <Parameter name="api_key" type="string" required="true">
    The xAI API key used to authenticate requests. You must provide a valid key for the service to function.
  </Parameter>

  <Parameter name="voice_id" type="string" required="false">
    The voice to use for speech synthesis. For voice IDs and samples, refer to the [xAI documentation](https://docs.x.ai/developers/model-capabilities/audio/text-to-speech#voices).
  </Parameter>

  <Parameter name="language" type="string" required="true">
    The BCP-47 language code for speech synthesis. For example, use `en` for English. For supported language codes, refer to the [xAI documentation](https://docs.x.ai/developers/model-capabilities/audio/text-to-speech#supported-languages).
  </Parameter>

  <Parameter name="sample_rate" type="integer" required="false">
    The audio sample rate in Hz. Supported values: `8000`, `16000`, `22050`, `24000`, `44100`, `48000`.
  </Parameter>
</ParameterList>

For more information, refer to the [xAI Text to Speech documentation](https://docs.x.ai/developers/model-capabilities/audio/text-to-speech).