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June 1, 2026

What’s New: Week of June 1, 2026

  1. xAI Speech-to-Text and Text-to-Speech: xAI is now available as a transcriber (STT) and voice (TTS) provider for assistants.

  2. Upgraded Vapi Voices: A new text-to-speech model powering Vapi Voices makes them sound more authentic, human, and consistent — at ~50% lower cost.

    • Existing deployments don’t change automatically — opt in by setting version: 2 on the voice configuration via the API or Dashboard. See Vapi Voices for supported voices and audio samples.

  3. Pronunciation Dictionaries in the Dashboard: The Assistants view now supports creating new pronunciation dictionaries directly from the dashboard.

  4. Phone Number Fixes: Improvements to phone number creation and listing.

    • The Phone Numbers list no longer breaks on rows with no number or SIP URI.
    • Creating a phone number now validates its Vapi identifier up front.