AssemblyAI

AssemblyAI

The best way to build Voice AI apps with one robust API

4.8•27 reviews•

6.7K followers

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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.

AssemblyAI

Launch date
Voice Agent API
Voice Agent APIOne API to build production-ready voice agents

Launched on April 30th, 2026

AssemblyAI: Universal-3 Pro Streaming
AssemblyAI: Universal-3 Pro Streaming The most accurate streaming speech model for voice agents.

Launched on March 4th, 2026

Universal-3 Pro
Universal-3 ProThe first of its kind promptable speech language model

Launched on February 4th, 2026

Universal-Streaming
Universal-StreamingUltra-fast, ultra-accurate streaming STT for voice agents.

Launched on June 3rd, 2025

Universal 2
Universal 2Speech-to-text for conversational data

Launched on October 31st, 2024

Universal-1
Universal-1Multilingual speech AI model trained on 12.5M hours of data

Launched on May 21st, 2024

LeMUR
LeMURThe easiest way to build LLM apps on voice data

Launched on December 11th, 2023

AssemblyAI Auto Chapters
AssemblyAI Auto ChaptersAutomatically summarize audio and video files with an API

Launched on November 29th, 2021

AssemblyAI - Speech-to-Text API
AssemblyAI - Speech-to-Text APIAPIs to automatically transcribe and understand audio

Launched on August 4th, 2017