Grok, a product of xAI, has launched its Speech to Text (STT) and Text to Speech (TTS) APIs, providing developers with powerful tools for integrating voice functionalities into applications. These APIs, built on the same technology that supports Tesla vehicle voice systems and Starlink customer support, feature instant multi-speaker transcription across 25 languages and include advanced capabilities such as speaker diarization and word-level timestamps. Grok’s STT API has been evaluated against top models, demonstrating a competitive edge in accuracy across various domains, making it suitable for business uses like medical and legal applications.

Tesla: Tesla is an electric vehicle manufacturer advancing autonomous driving and in-car AI experiences. Its vehicles integrate Grok Voice powered by the same stack as the new audio APIs for conversational assistance. Recent software updates have added wake words and customizable Grok personalities to enhance driver interaction.
Starlink: Starlink is SpaceX’s satellite internet service delivering global broadband coverage. Customer support recently adopted a Grok Voice AI chatbot to handle technical issues and sales inquiries. It utilizes the underlying Grok technology stack shared with the newly released Speech to Text and Text to Speech APIs.
Grok Speech to Text: Grok Speech to Text is xAI’s standalone API providing high-accuracy transcription with low latency, speaker diarization, and multichannel support across multiple languages. It includes intelligent inverse text normalization to structure spoken numbers, dates, and currencies into proper formats. This API, now available to developers, builds on the same stack powering Grok Voice in Tesla vehicles and Starlink customer support.
Grok Text to Speech: Grok Text to Speech is xAI’s standalone API generating natural, expressive speech from text using simple inline tags for prosody and emotions like laughter, whispers, and pauses. It supports both batch REST and real-time WebSocket generation for interactive applications. Recently launched alongside Speech to Text, it shares the technology stack used in Grok Voice for Tesla and Starlink.

`json
{
“API Launch”: “Grok Speech to Text and Text to Speech APIs are made available as standalone endpoints for developers building voice agents, transcription tools, and more.”,
“Developer Features”: “Both APIs offer multilingual support across 25+ languages, real-time streaming via WebSocket, and advanced controls including speaker separation and expressive speech tags.”,
“Integration Examples”: “The APIs utilize the stack used in Tesla vehicle voice systems and Starlink’s customer support platform.”
}
`