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.
Universal-3 Pro Streaming is the most accurate real-time STT model for voice agents. With entity detection, speaker labels, and code switching, it's built for the hard stuff: disfluencies, alphanumerics, and noisy environments. One API. 99+ languages. Try it free.
Universal-3 Pro is a new class of speech language model built for Voice AI. Control transcription using instructions and domain context like names, terminology, and topics to get accurate output at the source. No custom models, no post-processing pipelines, no hallucinations. Includes 1,000 keyterms, audio tagging, and 6-language code-switching for $0.21/hr.
AssemblyAIThe best way to build Voice AI apps with one robust API
AssemblyAI