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AssemblyAI

Speech-to-text and speech understanding APIs for voice AI applications

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AssemblyAI provides APIs for speech-to-text and speech understanding, helping developers turn audio into transcripts and structured data. It supports pre-recorded, real-time, and sync speech-to-text, along with a speech understanding API for extracting speaker identification, sentiment, chapters, and summaries. A voice agent API, dictation API, and LLM gateway for routing transcripts to models such as GPT, Claude, and Gemini are also available.

The platform includes Guardrails for PII redaction and content moderation, Medical Mode for healthcare terminology, and support for 99 languages. Models such as Universal-3.5 Pro and Universal-2 can be used via the managed AssemblyAI Cloud or self-hosted on your own infrastructure. A no-code playground is available for testing models. AssemblyAI offers a free sign-up option, with paid accounts providing additional controls such as opting out of model training. Enterprise options include HIPAA and BAA availability.

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