Vapi Review 2026

Voice AI platform for building phone-calling agents that sound human and integrate with any business system.

Vapi is the leading developer platform for voice AI agents — real-time phone agents that can call and answer calls, hold sub-second-latency conversations, transfer to humans, and integrate with your CRM, calendar, and databases. The pitch is straightforward: bring your own LLM, TTS voice, and telephony provider (or use Vapi's), define a system prompt and a set of tools, and get a phone number that runs an AI agent capable of taking restaurant reservations, screening leads, doing sales outreach, or answering support calls. The platform handles the hard parts — real-time transcription, natural turn-taking, interruption handling, background noise robustness, DTMF, warm transfers to human agents — so builders can focus on the conversation design and tool integrations. Vapi supports OpenAI, Anthropic, Groq, and custom endpoints for the LLM; ElevenLabs, Cartesia, Deepgram, PlayHT for voices; Twilio, Telnyx, Vonage for telephony. Native MCP support means agents can consume MCP servers as tool sources — a scheduling agent can hit your calendar server, a support agent can query your knowledge base. Pricing is usage-based ($0.05/minute base + LLM/TTS/telephony costs), with free credits to start and enterprise tiers for volume. Vapi is a strong pick when you need a phone-first agent that actually sounds decent.