The most accurate streaming speech model for voice agents.
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.
Universal-3 Pro Streaming integrates with Speech Understanding APIs (Speaker Identification, sentiment analysis, key phrases) and LLM Gateway for real-time analysis. Add-on features enable extraction of meaning and actionable insights during live conversations.
AssemblyAI provides a single platform combining real-time STT, Speech Understanding, Voice Agent API, and LLM Gateway. Developers integrate once and ship production voice agents the same day without managing infrastructure, model selection, or fallback logic.
Universal-3 Pro Streaming supports English, Spanish, German, French, Portuguese, and Italian with industry-leading multilingual accuracy. Real-time transcription via WebSocket enables live captioning, summaries, and sentiment analysis as conversations happen.
AssemblyAI's infrastructure offers no concurrency limits, no throttles, and no forced commitments. Universal-3 Pro Streaming scales seamlessly from initial development to 400,000+ hours monthly, with global redundancy and enterprise-grade uptime.
Universal-3 Pro Streaming delivers best-in-class accuracy for voice agents with advanced prompting, disfluency control, code-switching, and real-time diarization. The model is tuned for how people actually talk, enabling agents to respond fast with high confidence in understanding user intent.