xai/grok-voice-asr

grok-voice-asr
Docs
Schema

[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.

$0.0001/sec
speech-to-text

Input

Public http(s) URL of the audio file for transcription. File upload is not supported.
Hint: Drag and drop files, paste from clipboard (Ctrl/Cmd+V), or provide a URL.
Key terms to bias transcription toward (product names, proper nouns). Max 100 terms, each up to 50 characters.
Format hint for raw/headerless audio only. Do not set for MP3/WAV/etc. Requires sample_rate when set.
Number of channels for multichannel raw audio (2–8). Container formats are usually auto-detected.
When true, enables speaker diarization; words include speaker ids.
When true, keep filler words (uh/um/er) in the transcript.
When true, enables Inverse Text Normalization (e.g. spoken numbers to written form). Requires language.
Language code for Inverse Text Normalization when format=true. Required when format is true.
When true, transcribes each audio channel independently.
Sample rate in Hz for raw audio. Required when audio_format is set.

Result

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README

Attributes

Series

Parameters

Name Description Type Required Enums
url Public http(s) URL of the audio file for transcription. File upload is not supported. string Yes -
keyterm Key terms to bias transcription toward (product names, proper nouns). Max 100 terms, each up to 50 characters. string[] No -
audio_format Format hint for raw/headerless audio only. Do not set for MP3/WAV/etc. Requires sample_rate when set. string No pcm, mulaw, alaw
channels Number of channels for multichannel raw audio (2–8). Container formats are usually auto-detected. integer No -
diarize When true, enables speaker diarization; words include speaker ids. boolean No true, false
filler_words When true, keep filler words (uh/um/er) in the transcript. boolean No true, false
format When true, enables Inverse Text Normalization (e.g. spoken numbers to written form). Requires language. boolean No true, false
language Language code for Inverse Text Normalization when format=true. Required when format is true. string No ar, cs, da, nl, en, fil, fr, de, hi, id, it, ja, ko, mk, ms, fa, pl, pt, ro, ru, es, sv, th, tr, vi
multichannel When true, transcribes each audio channel independently. boolean No true, false
sample_rate Sample rate in Hz for raw audio. Required when audio_format is set. integer No 8000, 16000, 22050, 24000, 44100, 48000

Pricing

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

Unit: $/sec

Pricing
$0.0001/sec
  • xai/grok-voice-tts: [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.

Related Resources

Grok Voice
Grok VoiceSeries
xai/grok-voice-tts
xai/grok-voice-ttstext-to-speech