Telnyx native TTS provider - Telnyx

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.KokoroTTS.af_heart

REST:

curl --request POST \
  --url https://api.telnyx.com/v2/text-to-speech/speech \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "text": "Hello.",
  "voice": "Telnyx.Ultra.Clara"
}'

Models

Model	Latency	Quality	Languages	Voice Source	WebSocket	REST
KokoroTTS	Lowest	Good	5 languages	Pre-built	Yes	Yes
Qwen3TTS	Medium	High	11 languages	Cloned (Voice Design)	Yes	Yes
Ultra	Lowest	Highest	44 languages	Pre-built + Cloned (Voice Design)	No	Yes
Grok	Higher	High	20+ languages	Pre-built	Voice AI	Yes
Bayan	Low	Good	Arabic (13 dialects) + English	Pre-built + Cloned (Voice Design)	Yes	Yes
Sukhan	Low	Good	Urdu	Pre-built	Yes	Yes

Ultra is REST-only, not available over public WebSocket. Grok is available for Voice AI Assistants and direct REST TTS calls.

Browse all available voices via the Voices API or the Voice Design.