Grok Voice Transcribe 2.0
xAI's speech-to-text model — 2.3% batch WER at $0.10 an hour, now the API default.
About
Grok Voice Transcribe 2.0, released September 18, 2026, is xAI's second-generation speech-to-text model. It transcribes at $0.10 per audio hour for batch jobs and $0.20 per audio hour for streaming, with diarization, timestamps, and key terms included. It adds automatic language detection with mid-recording language switches in a single pass, and xAI says an internal short-phrase set meant to mimic voice-assistant commands dropped word error rate from 20.6% to 6.8%.
The independent numbers are solid: Artificial Analysis measured a 2.3% batch word error rate (down from 4.0% on version 1.0) and a 2.7% streaming final-transcript WER at 0.49 seconds after end of speech, briefly putting it at the top of the public real-time rankings before Microsoft's MAI-Transcribe-2-Streaming overtook it.
On October 2, 2026, version 1.0 was deprecated and reached end of life; all requests to that slug are routed to 2.0 at the same price, so 2.0 is now the default for new and existing integrations.
Specs
Context window
Pricing
Free quota
API access
Weights
Released
Benchmarks
Independent (Artificial Analysis): batch WER 2.3%; streaming final 2.7% at 0.49s after end of speech.
Provider: internal short-phrase set WER 20.6% → 6.8%.
Provider-reported unless a source says otherwise. Benchmarks are marketing-adjacent by nature — treat them as directional.
Use cases
Trust score — 8/10
Release facts (September 18, 2026; $0.10/$0.20 per audio hour; v1.0 EOL October 2) verified in xAI's docs and corroborated by independent press; the WER figures come from Artificial Analysis's independent leaderboard. Docked for: (1) it has already lost the streaming #1 spot to Microsoft's newer model; (2) the short-phrase WER improvement is xAI's own internal test; (3) proprietary with no weights.
How the trust score is built
Full methodology →- Adoption · stars/downloads, log-scaled vs peers
- 8.0/10
- Maintenance · recency, releases, issue load
- 9.0/10
- Openness · license + docs
- 3.0/10
- Manual review · sanity read + red-flag check
- 8.0/10
- · Adoption 8: released Sept 18, 2026; became API default Oct 2 with v1.0 EOL; xAI docs corroborated by press
- · Maintenance 9: actively maintained speech API; per-hour pricing published ($0.10 batch / $0.20 streaming)
- · Openness 3: proprietary API-only, no weights
- · Manual 8: AA independent leaderboard figures (2.3% batch WER; 2.7% streaming at 0.49s); short-phrase claims flagged xAI-internal