xAI announced on June 3, 2026, via its official account that the Text-to-Speech (TTS) and Speech-to-Text (STT) APIs for its Grok voice AI are now available on Vapi, the enterprise platform for building voice AI agents. Quoting a post from Vapi, xAI urged users to "try the most natural TTS and cost-effective STT APIs" on Vapi, while Vapi itself stated that "Grok STT and Grok TTS are now live on Vapi."1
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