AssemblyAI
The best way to build Voice AI apps with one robust API
4.8•27 reviews•6.7K followers
The best way to build Voice AI apps with one robust API
4.8•27 reviews•6.7K followers
AssemblyAI builds advanced speech language models that power next-generation voice AI applications. Its industry-leading speech-to-text delivers highly accurate transcription along with speaker detection, summarization, PII redaction, LLM gateway, and a Voice Agent API.
With async and real-time streaming support, developers can easily integrate AssemblyAI into AI notetakers, voice agents, AI medical scribes, call analytics tools, and more.
This is the 9th launch from AssemblyAI. View more
Voice Agent API
Launching today
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.
Free Options
Launch Team
AssemblyAI
AssemblyAI
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!
@dan_ince this is great, I’ve been using it in InterviewFlowAI, and like other Assembly products, this one is among the best.