Voice Agent API - One API to build production-ready voice agents

AssemblyAI

•7d ago

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.

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AssemblyAI

Hunter

📌

A voice agent API that's not first to market, knows it isn't, and made the case for itself anyway by being measurably better on the things that decide whether a voice agent actually works (accuracy on numbers/names, interruption handling, tool calls that don't go silent). Talk to the live demo. Read the comparison table. Then come back here with questions for the maker!

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8d ago

AssemblyAI

Maker

Maker here!

I built the voice agent API to fix a critical issue in agent conversations. The layer most people treat as a commodity input, speech recognition, is actually where voice agents live or die. If your agent confidently mishears a 16-digit order number, the conversation is already over. Nothing the LLM does next can save it.

So we own the whole stack end-to-end. Universal-3 Pro Streaming (16.7% missed error rate on alphanumerics vs 23.3% on gpt-realtime, 25.5% on Nova-3), speech-aware VAD that doesn't cut people off mid-thought, tool calls that stay conversational instead of going silent, mid-call config updates, and a 30s reconnect window because real production traffic drops.

Flat $4.50/hr. No per-token. No concurrency caps.

Talk to the live agent on the page. that's the actual API, not a sandbox. Then break it and tell me where it's bad. I'd love to know what you think!

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7d ago

@dan_ince this is great, I’ve been using it in InterviewFlowAI, and like other Assembly products, this one is among the best.

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7d ago