AssemblyAI

Voice AI infrastructure for speech-to-text, real-time transcription, and speech understanding APIs

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About AssemblyAI

Key Benefits

Pre-recorded speech-to-text API
Streaming speech-to-text API
Synchronous speech-to-text API
Voice Agent API
Speech Understanding (summarization, sentiment, topic detection)
Guardrails (PII redaction, content moderation)
Speaker diarization
Multilingual transcription
SDKs for Python and JavaScript

Use Cases

Transcribing recorded calls, podcasts, or meetings
Live captions and real-time agent assist
Voice agent orchestration
Meeting notetaking
Sales call intelligence
Medical scribing
Content repurposing from audio
Audio data privacy and compliance workflows

Pros

Comprehensive API coverage for speech-to-text and voice AI
Supports both pre-recorded and real-time audio
Advanced features like speaker diarization and PII redaction
Multilingual transcription across 99 languages
Detailed documentation and SDKs for integration

Cons

Streaming and Voice Agent APIs are billed on session duration, including idle time
Advanced features and higher concurrency may require paid plans
Primarily API-driven, requiring developer integration

Integrations

Python SDKJavaScript SDKLiveKit integrationPipecat integrationTwilio integration (coming)Langflow integrationMCP server for AI coding agents

Full details for AssemblyAI

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AssemblyAI offers Voice AI infrastructure with APIs for pre-recorded and real-time speech-to-text, voice agent orchestration, speech understanding, guardrails, and LLM access. The platform is designed for developers and teams needing accurate speech recognition, scalable infrastructure, and structured insights from audio data. Core APIs include asynchronous and streaming transcription, synchronous short-form transcription, and advanced features like speaker diarization, PII redaction, and sentiment analysis.

Key features

Pre-recorded speech-to-text API
Streaming speech-to-text API
Synchronous speech-to-text API
Voice Agent API
Speech Understanding (summarization, sentiment, topic detection)
Guardrails (PII redaction, content moderation)
Speaker diarization
Multilingual transcription
SDKs for Python and JavaScript

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