xAI
@xai
Grok's Text to Speech API is now available. Start building with natural voices and expressive controls to bring your apps to life. https://t.co/SMxWTB9m6N https://t.co/UtHT0uN148
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View on XxAI Launches Grok Text to Speech API with Five Natural Voices
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xAI launched its Text to Speech API, converting text to natural speech in five voices: Eve, Ara, Leo, Rex, and Sal. The API supports multiple audio formats and expressive controls — tagged speech features for pauses, laughter, whispers, pitch, speed, and emphasis. Pricing is $4.20 per million characters (600 rpm, 10 rps). The TTS API is in beta and joins xAI's Voice Agent API ($0.05/min, WebSocket, MCP support) and Speech to Text on the same platform.
This gives developers a single voice platform — text-to-speech, speech-to-text, and conversational agents — under one xAI API key. The inline tagging system lets you shape how a voice sounds in the text itself.
Add natural speech to any user-facing surface in your app by pointing the TTS endpoint at your content and using tagged controls to tune the voice's tone to context.
