Audio & voice models - AI Reserve Developer Documentation

Text-to-speech, speech-to-text and realtime voice sessions. Endpoints: POST /v1/audio/speech · POST /v1/audio/transcriptions · POST /v1/realtime/sessions. Prefer to search and filter? Browse models.

ElevenLabs

Model	Model id	Type	Pricing
Eleven Flash v2.5 Unverified-retention opt-in	`eleven-flash-v2-5`	Text-to-speech	billed per input character — see guide
Eleven Multilingual v2 Unverified-retention opt-in	`eleven-multilingual-v2`	Text-to-speech	billed per input character — see guide
Eleven v3 Unverified-retention opt-in	`eleven-v3`	Text-to-speech	billed per input character — see guide
Eleven v4 Unverified-retention opt-in	`eleven-v4`	Text-to-speech	billed per input character — see guide
ElevenLabs Scribe v2 served by fal	`scribe-v2`	Speech-to-text	$0.008 / minute

OpenAI

Model	Model id	Type	Pricing
GPT-4o mini Transcribe	`gpt-4o-mini-transcribe`	Speech-to-text	—

xAI

Model	Model id	Type	Pricing
Grok TTS	`grok-tts`	Text-to-speech	billed per input character — see guide
Grok Voice (realtime)	`grok-voice`	Realtime voice	billed per session second — see guide