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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. To hear the voices, browse the voice pages under Models. To make your first request, follow Your first request.