ME News Report, April 18 (UTC+8), according to Beating Monitoring, xAI has launched two standalone audio APIs: Grok Speech to Text and Grok Text to Speech. Both come from the same audio stack supporting Grok Voice, Tesla's in-car system, and Starlink customer service, now available as independent endpoints, allowing developers to directly integrate into voice agents, real-time transcription, accessibility tools, and podcasts. STT offers two modes. The REST API is used for batch transcription of large audio files with millisecond-level response; the WebSocket API is designed for real-time audio streams. Features include word-level timestamps, speaker diarization, multi-channel recognition, and Inverse Text Normalization, which automatically formats spoken numbers, dates, and currencies into standardized structured text. Supported languages exceed 25, with seamless switching during conversations. xAI also released a comparison of Word Error Rate (WER, lower is better): overall scene Grok 6.9%, ElevenLabs 9.0%, Deepgram 11.0%, AssemblyAI 12.9%; the gap in "Telephone Conversation Entity Recognition" is even larger, with Grok at 5.0%, compared to 12.0%, 13.5%, and 21.3% for the other three. In common business scenarios like meetings, video podcasts, and phone calls, Grok also maintains a slight lead. These figures are self-tested and published by xAI, with no third-party verification yet. Pricing-wise, batch STT is $0.10 per hour, streaming is $0.20 per hour; TTS costs $4.20 per million characters. TTS supports inline Speech Tags to control emotion and prosody, such as [laugh], [sigh], [whisper], etc. (Source: BlockBeats)

XAI0.66%

GROK-5.84%

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BudgetValidator

· 1h ago

Voice infrastructure begins standardization, benefiting small and medium developers

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MirrorBallGazingAtTheSky

· 3h ago

The same stack supports three scenarios; Elon Musk's reuse game is strong.

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AirdropSidequest

· 4h ago

WebSocket is suitable for streaming, REST is suitable for archiving, the design is reasonable

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CandlewickKid

· 8h ago

xAI has finally separated the voice stack, developers are ecstatic

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RetroRadioSignal

· 8h ago

Grok’s STT implements both REST and WebSocket dual modes, covering both batch and real-time needs—it’s quite detailed.

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PatinaTradingBell

· 8h ago

The audio stack used by both Tesla and Starlink should have proven its reliability.

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OracleBabysitter

· 8h ago

Accessibility tools +1, this is the warmth that technology should have

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xAI opens Grok STT and TTS audio APIs, with overall word error rate of STT reduced to 6.9%

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