For AI agents: a documentation index is available at the root level at /llms.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
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DocumentationAPI ReferenceMCPSDKsCLI (new)What's New?
DocumentationAPI ReferenceMCPSDKsCLI (new)What's New?
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What's New?

March 21, 2025
March 21, 2025
  1. OpenAI Voice Enhancements: When using OpenAI Voice models in Assistant.voice, you can now use specific text to speech models and add custom instructions to control your assistant’s voice output

  2. Improved Call Error Reporting: You can now use new Call.endedReason codes when a call fails to start or ends unexpectedly due to failing to retrieve Vapi objects. Refer to Call.endedReason for more details.

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