xAI Grok STT
STT haute précision — 6.9% WER global, 25+ langues, diarisation, ITN avancée, $0.10/h batch
Comparative Scores
Architecture
Medium relevance: competitive pricing ($0.10/h) and strong accuracy make it worth evaluating for Storygami/Edugami. However, US-only hosting and no GDPR documentation are blockers for Swiss/EU deployment. Best evaluated as part of the Grok Voice Think Fast 2.0 S2S pipeline ($0.08/min all-in) rather than standalone STT.
Analysis
Grok STT is the standalone transcription API built on the same stack as Grok Voice Think Fast 2.0. It achieves 6.9% WER globally across phone calls, meetings, video/podcasts and telephony — outperforming ElevenLabs Scribe v2 (9.0%), Deepgram Nova-3 (11.0%) and AssemblyAI (12.9%) in xAI's internal benchmark. Particularly strong on entity recognition (phone numbers, dates, currencies) thanks to advanced Inverse Text Normalization. Supports 25+ languages, word-level timestamps, speaker diarization, multichannel audio, and keyterm biasing. Priced at $0.10/h batch — among the most competitive in the market. Best evaluated as part of the Grok Voice Think Fast 2.0 S2S pipeline ($0.08/min all-in).
Strengths
- 6.9% WER global — surpasse Deepgram, ElevenLabs, AssemblyAI (benchmark xAI)
- ~10× plus précis en environnement bruité
- ITN avancée — entités, dates, devises correctement formatées
- Diarisation + timestamps mot par mot + multichannel
- 25+ langues
- $0.10/h batch — très compétitif
- Même stack que Grok Voice Think Fast 2.0
Weaknesses
- Benchmark interne xAI — validation Artificial Analysis indépendante à confirmer
- Cloud US uniquement — pas de région EU, RGPD à vérifier
- Pas d'option on-premise
- Pay-as-you-go uniquement — pas de plan d'abonnement
- Écosystème intégrations tiers moins mature que Deepgram
STT Capabilities
WebSocket streaming temps réel. REST API pour batch. VAD serveur intégré. Formats : PCM, PCMU, PCMA, Opus. Keyterms (100 termes max) pour biais de transcription.
25+ languages
Pricing
$0.10/h batch ($0.00167/min), $0.20/h streaming ($0.00333/min). Pay-as-you-go uniquement — pas de plan d'abonnement avec minutes incluses.
| Plan | Subscription/mo | Included | Overage/min |
|---|---|---|---|
StreamingRecommended $0.20/h streaming ($0.00333/min) | Free | Pay-as-you-go | $0.0033 |
Batch $0.10/h batch ($0.00167/min) | Free | Pay-as-you-go | $0.0017 |
Sovereignty & Compliance
Cloud uniquement (US). Pas d'option on-premise documentée.
Data residency: US (xAI). Pas de région EU documentée. RGPD à vérifier.
Cloud uniquement. Pas d'option on-premise documentée.
This sheet's verification
xAI internal benchmark (avril 2026) — validation Artificial Analysis indépendante à confirmer
Update note: Ajout initial — lancement standalone STT/TTS API xAI (17 avril 2026). Grok Voice Think Fast 2.0 lancé le 29 juillet 2026.
This date covers provider-specific prices, capabilities and notes. Comparative benchmarks follow the synchronization and methodology shown above.
ELO benchmarks / indices: Artificial Analysis