xai/grok-voice-tts

grok-voice-tts
Docs
Schema

[Core Function] Grok Voice TTS converts text into natural spoken audio with expressive voices and optional speech tags embedded in the text. [Strengths] Supports 20+ languages (plus auto-detect), 26 built-in voices, multiple codecs (mp3/wav/pcm/mulaw/alaw), and custom voice IDs. [Best For] Product voiceovers, IVR/telephony (mulaw/alaw), and multilingual narration. [Limitations] Do NOT exceed 15,000 characters per request. Audio is returned on the completed task after polling. [Routing] Use this model for xAI Grok Voice quality or custom cloned voices. [Built-in voices] Original: eve (default), ara, leo, rex, sal. Flagship: altair, atlas, carina, castor, celeste, cosmo, helios, helix, iris, kepler, lumen, luna, lux, naksh, orion, perseus, rigel, sirius, ursa, zagan, zenith — case-insensitive; custom voice IDs are also accepted as voice_id.

$15.0000/M chars
text-to-speech

Input

Text to synthesize (max 15,000 characters). Supports inline speech tags such as [pause], [laugh], and wrapping tags like <whisper>...</whisper>.
BCP-47 language code, or auto for automatic detection.
Voice ID for synthesis. Built-in voices are listed below (26 total, case-insensitive). Custom voice IDs from your xAI voice library are also accepted.
MP3 bit rate in bps. Only applied when codec is mp3. Default 128000.
Audio codec. Default mp3.
Latency vs quality trade-off: 0 best quality (default), 1 lower first-byte latency, 2 lowest first-byte latency.
Sample rate in Hz. Default 24000.
Speech speed multiplier. Range 0.7–1.5. Default 1.0.
When true, normalize written-form text (numbers, abbreviations) before synthesis.

Result

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README

Attributes

Series

Parameters

Name Description Type Required Enums
text Text to synthesize (max 15,000 characters). Supports inline speech tags such as [pause], [laugh], and wrapping tags like …. string Yes -
language BCP-47 language code, or auto for automatic detection. string Yes auto, en, ar-EG, ar-SA, ar-AE, bn, zh, fr, de, hi, id, it, ja, ko, pt-BR, pt-PT, ru, es-MX, es-ES, tr, vi
voice_id Voice ID for synthesis. Built-in voices are listed below (26 total, case-insensitive). Custom voice IDs from your xAI voice library are also accepted. string No -
bit_rate MP3 bit rate in bps. Only applied when codec is mp3. Default 128000. integer No 32000, 64000, 96000, 128000, 192000
codec Audio codec. Default mp3. string No mp3, wav, pcm, mulaw, alaw
optimize_streaming_latency Latency vs quality trade-off: 0 best quality (default), 1 lower first-byte latency, 2 lowest first-byte latency. integer No 0, 1, 2
sample_rate Sample rate in Hz. Default 24000. integer No 8000, 16000, 22050, 24000, 44100, 48000
speed Speech speed multiplier. Range 0.7–1.5. Default 1.0. number No -
text_normalization When true, normalize written-form text (numbers, abbreviations) before synthesis. boolean No true, false

Pricing

Input image ($/img): 0.0000
Input video ($/sec): 0.0000

Unit: $/M chars

Pricing
$15.0000/M chars
  • xai/grok-voice-asr: [Core Function] Grok Voice ASR transcribes a single public audio URL into text via an async task. [Strengths] Word-level timestamps, optional speaker diarization, multichannel transcription, Inverse Text Normalization (format + language), keyterm biasing, and filler-word control. [Best For] Meeting notes, call-center recordings, captions, and batch audio-to-text pipelines. [Limitations] Do NOT use file upload; URL-only input. Do NOT use for live or real-time streaming transcription. Audio must be publicly reachable (max 500 MB). [Routing] Use this model for xAI Grok Voice ASR quality with URL-based audio.

Related Resources

Grok Voice
Grok VoiceSeries
xai/grok-voice-asr
xai/grok-voice-asrspeech-to-text