Voice Agent API

What it does

The fastest path to a working Voice Agent, built on the most accurate Voice AI in the market. Stream audio in, get audio back. We handle the rest. ~1s latency. Best-in-class accuracy on the stuff that matters (numbers, emails, names). Tool calling that doesn't go silent. Mid-call prompt + voice + tool updates. $4.50/hr flat. No per-token. No concurrency caps. Most devs ship a working agent the same day.

Build production-ready voice agents on a single connection. Low-latency speech-to-speech with turn detection, tool calling, and unified billing at $4.50/hr.

Models, APIs, and infrastructure in one place. Build voice into any product, on any stack. Zoom leverages AssemblyAI to help advance its AI research and development. Siro achieves a 90% reduction in customer complaints and support tickets. Our new flagship speech-to-text model handles real-world audio the way it actually happens. Available for real-time and pre-recorded audio. Ask questions about our products, APIs, and documentation to experience real-time Voice AI in action. Universal-3.5 Pro gets the details right — emails, phone numbers, order IDs, and names — so your voice agent can actually complete customer tasks. Agent Thanks for calling the prescription refill line. This is Priya.…from assemblyai.com

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