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

# Text to speech

Text-to-speech (TTS) models take written text and turn it into natural-sounding spoken audio. In SLNG voice agents this is the "Speak" step: the LLM sends back a response and the TTS model gives it a voice the caller hears. The voice's quality and speed shape how the whole agent feels. A natural voice builds trust, and a fast one keeps the conversation flowing without awkward pauses.

For every supported TTS model, with its provider, regions, languages, and price, see the [text to speech catalog](/models/catalog/text-to-speech). To hear the voices, browse the voice pages under **Models**.

To make your first request, follow [Your first request](/guides/models/your-first-request).


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