AssemblyAI's Speech AI models transcribe speech to text and extract insights from voice data. See pricing, features, and reviews.
Researched and fact-checked by Bartu Cavusoglu · Updated August 8, 2026
Category
AI Voice
Pricing
freemium
Verified
Not yet
Last updated
August 8, 2026
APIVoice AIAI
AssemblyAI's Speech AI platform gives developers pre-recorded, real-time streaming, and Speech Understanding APIs to transcribe audio and pull structured insights such as summaries, sentiment, and content-safety signals out of voice data. The platform also includes a Voice Agent API for building voice-enabled applications and supports 99 languages. AssemblyAI is aimed at developers who need reliable speech-to-text APIs and voice-data insight extraction to add voice capabilities to any product or stack.
Key Features
Pre-recorded Speech-to-Text API — Transcribe pre-recorded audio files with high accuracy using AssemblyAI's Universal speech models.
Real-time Streaming API — Transcribe live audio streams in real time over WebSocket sessions.
Speech Understanding API — Extract insights from voice data such as summarization, sentiment analysis, and content-safety detection.
Voice Agent API — Build voice-enabled applications with an all-inclusive API combining speech-to-text, LLM, and text-to-speech.
LLM Gateway — Access large language models through a unified gateway billed per token.
Multi-language support — Transcribe and understand speech in 99 supported languages.