Speech-to-text API for pre-recorded and streaming audio, with speaker labels, language detection, speech understanding and voice agents. SDKs for Python and JavaScript/TypeScript.
$50 in free credits at signup, no credit card required.
Universal-2 pre-recorded speech-to-text (Universal-3.5 Pro: $0.21/hr).
Free accounts, async; paid accounts get 200+.
Transcript endpoint; direct uploads via /v2/upload capped at 2.2 GB.
Async audio deleted within 24-48 hours; transcript deletion begins at 30 days.
Certain PII-redacted files used for training unless opted out, on a BAA, or using EU servers.
EU endpoint api.eu.assemblyai.com keeps data in the EU.
Get a transcript split by speaker, with automatic language detection, from any audio URL using the AssemblyAI Python SDK.
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