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Selecting Telnyx

Telnyx is the default provider. If you don’t specify a provider, you get Telnyx. WebSocket: 
wss://api.telnyx.com/v2/text-to-speech/speech?voice=Telnyx.NaturalHD.astra
REST: 
curl --request POST \
  --url https://api.telnyx.com/v2/text-to-speech \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "text": "Hello.",
  "voice": "Telnyx.NaturalHD.astra"
}'

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Models

ModelLatencyQualityLanguagesVoice SourceWebSocketREST
NaturalLowGoodEnglishPre-built (Rime Mist)YesYes
NaturalHDLowBetter9 languagesPre-built (Rime Arcana)YesYes
KokoroTTSLowestGood5 languagesPre-builtYesYes
Qwen3TTSMediumHigh11 languagesCloned (Voice Design Lab)YesYes
UltraLowestHighest44 languagesPre-builtNoYes
Ultra is REST-only — not available over public WebSocket.
Browse all available voices via the Voices API or the Voice Design Lab.