For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.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?

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March 31, 2026
March 31, 2026
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September 29, 2025

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What’s New: October 2025 – March 2026

Here’s a summary of major items shipped from October 2025 through March 2026.

Platform

  1. Squads v2: Visual builder to simplify sophisticated multi-assistant orchestration with seamless handoffs between specialized agents.

  2. Composer (Alpha): Intelligent assistant inside the dashboard that allows you to describe what you need through plain text prompts to help build, adjust, and debug voice agents.

  3. Simulations (Alpha): Voice agent testing feature to build confidence through enabling systematic, AI-powered testing in specific scenarios with evaluation of outcomes.

  4. Monitoring & Issues: Automated call quality monitoring with trigger-based issue detection, alerting, and resolution suggestions.

  5. HIPAA with Data Retention: New compliance mode with private storage and in-dashboard toggle/purchase flow — available for additional cost.

  6. Zero Data Retention: Compliance mode that keeps context data during call as needed to execute tasks and retains no data afterwards.

  7. Consolidated Logs: Unified log viewing into a single page.

  8. Vapi Voices: 12 new ultra-realistic voices released, optimized for latency and cost with adjustable speed controls exposed. 8 legacy voices deprecated.

New Models & Provider Support

Transcriber Models (Speech-to-Text)

  1. Deepgram Nova-3 Languages: Added Hebrew, Urdu, Tagalog, and Arabic bilingual support.

  2. Cartesia Transcriber: ink-whisper.

  3. Soniox: stt-rt-v4.

Intelligence Models (LLM)

  1. GPT-5 Family: OpenAI’s latest intelligence models, including GPT-5, 5-Mini, 5-Nano, 5.1, 5.2, 5.4, 5.4-Mini, 5.4-Nano.

  2. Claude 4.5–4.6: Anthropic’s latest intelligence models Sonnet 4.5, Opus 4.5, Opus 4.6, Sonnet 4.6.

  3. Gemini 3 Flash: Google’s latest intelligence models.

  4. Grok 4 Fast: Reasoning and non-reasoning variants.

  5. GPT Realtime Mini: OpenAI’s lightweight realtime model.

Voice Models (Text-to-Speech)

  1. Cartesia: sonic-3, sonic-3-2026-01-12, sonic-3-2025-10-27.

  2. WellSaid: Caruso (new), legacy.

  3. Inworld: inworld-tts-1 (REST, original), inworld-tts-1.5-max (WebSocket, $10/M chars), inworld-tts-1.5-mini (WebSocket, $5/M chars).

  4. ElevenLabs Scribe v2: Latest version of ElevenLabs speech-to-text.

Developer Tools & API

  1. Structured Outputs Improvements: Updates to our AI-powered analysis and data extraction tool, including transient structured outputs, audio-based extraction, and regex extraction.

  2. SIP Request Tool + DTMF over SIP INFO: Send SIP requests and DTMF tones via SIP INFO messages during calls.

  3. Variable Passing Between Tool Calls: Pass output variables from one tool call as input to subsequent tool calls.

  4. Encrypted Tool Arguments: Encrypt sensitive tool arguments to protect data in transit.

  5. Low Confidence Speech Hook: Hook that triggers when the transcriber returns low-confidence speech results.

  6. Time Elapsed Hook: Hook that triggers at specified time intervals during a call.

  7. assistant.speechStarted Event: New event fired when the assistant begins speaking.

  8. MCP Improvements: Bearer auth, $ref dereferencing, child tool messages/discovery.

  9. Warm Transfer Improvements: SIP support, caller ID, context engineering, variable filling.