Grok STT's word-level timestamps and speaker separation are essential for podcast editing teams, but WER data is self-reported, waiting for third-party re-evaluation.

According to ME News reports, xAI has launched two standalone audio APIs: Grok STT and Grok TTS, originating from the same audio stack, supporting Grok Voice, Tesla in-car systems, and Starlink customer service, among others. STT offers REST batch transcription and WebSocket real-time streaming, with word-level timestamps, speaker separation, multi-channel support, and inverse text normalization, covering over 25 languages; TTS supports inline tags for emotion and prosody. They also announced WER comparisons, with Grok leading in multiple scenarios, and no third-party re-evaluation available yet. Pricing: STT batch processing at $0.10 per hour, streaming at $0.20 per hour, TTS at $4.20 per million characters.