AssemblyAI

Provides Speech AI models to transcribe speech to text and extract insights from voice data.

Founded: Not disclosed
Headquarters: Not disclosed
Company size: Not disclosed
Products tracked: 7

Products by AssemblyAI

7 products

Pre-recorded Speech-to-Text APITranscribes pre-recorded audio in 99 languages with speaker diarization, natural language prompting, and PII reduction.0.00 reviewsSpeech & Audio Models

Realtime Speech-to-Text APITranscribes live audio and video files in real time at ~150ms latency and high-quality accuracy.0.00 reviewsSpeech & Audio Models

Sync Speech-to-Text APIReturns finished transcripts in a single API call in ~134ms.0.00 reviewsSpeech & Audio Models

Speech Understanding APIExtract structured insights from speech without building custom NLP pipelines.0.00 reviewsSpeech & Audio Models

Guardrails and SafetyCompliance-grade safety controls at the transcription layer.0.00 reviewsAI Safety & Governance

LLM GatewayOne OpenAI-compatible API for every frontier model with automatic fallbacks, zero markup, and zero data retention.0.00 reviewsModel APIs & Gateways

Voice Agent APIEnd-to-end voice agent infrastructure built on the Realtime Speech-to-Text API.0.00 reviewsSpeech & Audio Models

Customers of AssemblyAI

Diffusion StudioMedia & Entertainment GrainTechnology & Software PhenomTechnology & Software RunwayMedia & Entertainment

Pricing for AssemblyAI

Usage Based

This is the broad commercial model reported for AssemblyAI. Product-level terms are listed below when available.

Pre-recorded Speech-to-Text APITranscribes pre-recorded audio in 99 languages with speaker diarization, natural language prompting, and PII reduction.

Pricing model: Usage Based
Entry option: Free plan and Free trial

Realtime Speech-to-Text APITranscribes live audio and video files in real time at ~150ms latency and high-quality accuracy.

Pricing model: Usage Based
Entry option: Free plan and Free trial

Sync Speech-to-Text APIReturns finished transcripts in a single API call in ~134ms.

Pricing model: Usage Based
Entry option: Free plan and Free trial

Speech Understanding APIExtract structured insights from speech without building custom NLP pipelines.

Pricing model: Usage Based
Entry option: Free plan and Free trial

Guardrails and SafetyCompliance-grade safety controls at the transcription layer.

Pricing model: Usage Based
Entry option: Free plan and Free trial

LLM GatewayOne OpenAI-compatible API for every frontier model with automatic fallbacks, zero markup, and zero data retention.

Pricing model: Usage Based
Entry option: Free plan and Free trial

Voice Agent APIEnd-to-end voice agent infrastructure built on the Realtime Speech-to-Text API.

Pricing model: Usage Based
Entry option: Free plan and Free trial

Trust profile

Security and compliance

HIPAA

PII Redaction

Profanity Filtering

Content Moderation

HIPAA-Eligible (Medical Mode on Pre-recorded and Realtime STT with BAA)

Latest updates from AssemblyAI

Jul 252026

New featureProduct launch

AssemblyAI Launches Universal 3.5 Pro Realtime Integration for LiveKit

AssemblyAI has released an integration for its Universal 3.5 Pro Realtime speech-to-text model into the LiveKit agents framework, enabling developers to build voice agents with live conversation context, voice focus, and server-side turn detection. The model is specifically designed for real-time applications and supports multilingual capabilities and programmable turn-detection parameters. This integration facilitates low-latency speech processing for LiveKit-based voice projects.

IntegrationLiveKit

Jul 142026

Product launch

AssemblyAI Launches Sync API for Low-Latency Short-Form Transcription

AssemblyAI launched the Sync API, an HTTP-based service for transcribing short audio clips (up to 2 minutes). By sending an audio file in a single request, users receive a transcript in approximately 134 ms, eliminating the need for polling or persistent WebSocket connections. The API utilizes the Universal-3.5 Pro model, offering high-accuracy transcription for dictation, voice agents, and IVR workflows without the latency associated with traditional asynchronous batch processing or the overhead of real-time streaming sessions.

Jul 132026

Security

Fix: Dashboard Payment Method Update Functionality

AssemblyAI resolved an issue in its dashboard that caused errors when updating payment methods. A change in the Stripe response schema had resulted in 400 errors for users attempting to modify their payment details; this service has been fully restored.