KokoroTTS

Telnyx KokoroTTS — lowest-latency lightweight TTS.

Voice format: Telnyx.KokoroTTS.<voice>

Lightweight, lowest-latency model. 5 languages: en, es, fr, it, pt.

Voice Samples

Voice	Language	Gender	Sample
Telnyx.KokoroTTS.af_heart	en-US	Female
Telnyx.KokoroTTS.am_adam	en-US	Male
Telnyx.KokoroTTS.bf_emma	en-UK	Female

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WebSocket

Query Parameters

wss://api.telnyx.com/v2/text-to-speech/speech?voice=Telnyx.KokoroTTS.af_heart

Parameter	Type	Default	Description
audio_format	string	mp3	mp3, linear16.
sample_rate	integer	24000	24000.

Voice Settings

None. All synthesis parameters are fixed. The init frame only needs {"text": " "}.

REST API

Fields

No model-specific fields. Audio format is always MP3.

Field	Type	Default	Description
output_type	string	binary_output	binary_output, base64_output, or audio_id.

Response

Default (binary_output): chunked audio bytes with Content-Type: audio/mpeg.

With output_type: "base64_output": JSON with base64-encoded audio.

With output_type: "audio_id": JSON with an audio_url for deferred retrieval.