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xAIGrok Voice familyCurrentSpeech and audioReleased 18 Sep 2026

Grok Voice Transcribe 2.0

Model idgrok-voice-transcribe-2.0

Price$0.10 per hour, batch

Checked29 September 2026

Where it stands

23newer speech and audio models since its release

The 5 newest are listed. All speech and audio models

Before it from xAI
Grok Voice Think Fast 2.029 Jul 2026
After it from xAI
Grok Voice 3.014 Oct 2026
Weights
Closed weights; access is hosted only.

How to call it

2 ways to use Grok Voice Transcribe 2.0, with the model id each provider expects.

Providers, model ids, endpoints and docs for Grok Voice Transcribe 2.0
ProviderModel idEndpointDocs
xAI API (REST) grok-voice-transcribe-2.0 https://api.x.ai/v1/stt docs.x.ai
xAI API (WebSocket streaming) grok-voice-transcribe-2.0 wss://api.x.ai/v1/stt docs.x.ai

Pricing

Prices for Grok Voice Transcribe 2.0
Per hour, batch$0.10
Per hour, streaming$0.20

As published: “USD per hour of audio (REST batch / WebSocket streaming); diarization, timestamps and key-term biasing included”.

Source: x.ai, checked 29 September 2026.

Specs

Input
Audio
Output
Text
Context window
Not published
Max output
Not published
Open weights
No
Licence
Proprietary
Released
18 September 2026
Status
Current
Type
Speech and audio

What stands out

What its maker marketed at launch, and what people found later, each with its source.

  • Top streaming STT accuracy (claimed)

    xAI says it ranks #1 for accuracy among 32 streaming models on the Artificial Analysis leaderboard; multilingual short-phrase WER 20.6% -> 6.8% vs v1.0 (‘2x as accurate’).

    Source: x.ai

  • Very low price with diarization included

    $0.10/hr batch and $0.20/hr streaming, with speaker diarization, word timestamps, up to 8-channel multichannel and 100 key terms per request at no extra cost.

    Source: x.ai

Notes

Launched 2026-09-18 as drop-in upgrade of the Grok STT API (first released 2026-04-17 with grok-voice-transcribe-1.0, which can be pinned but will be deprecated). Up to 500 MB files; WAV/MP3/OGG/Opus/FLAC/AAC/MP4/M4A/MKV plus raw PCM/mu-law/A-law at 8-48 kHz; Smart Turn end-of-turn detection, VAD, inverse text normalization, filler removal, mid-recording language switching. Docs list ~25 languages for formatting.

curl https://api.x.ai/v1/stt -H "Authorization: Bearer $XAI_API_KEY" \
  -F model=grok-voice-transcribe-2.0 -F file=@call.wav -F diarize=true

Sources: https://x.ai/news/grok-voice-transcribe-2 · https://docs.x.ai/developers/model-capabilities/audio/speech-to-text · https://x.ai/news/grok-stt-and-tts-apis