Provider pricing
AssemblyAI AI API pricing
AssemblyAI builds speech-AI infrastructure: Universal-2 ASR for transcription, real-time streaming, speaker diarization, sentiment, PII redaction, and LeMUR — a framework for running Claude over transcripts. Pricing is per-second of audio with volume discounts and a free tier.
Founded2017
HeadquartersSan Francisco, CA
Tracked models2
Best for
Meeting recorders, call-center analytics, and media teams indexing audio at scale.
Strengths
- Universal-2 ASR — top WER on benchmark datasets
- Real-time streaming with diarization and sentiment built in
- LeMUR — point Claude at any transcript with one API call
- PII redaction, content moderation, and topic detection out of the box
Tracked AssemblyAI models
| Model | Input $/M | Output $/M | Context | Tier | Best for |
|---|---|---|---|---|---|
| Universal-2 | $0.370 | $0 | 0 | Flagship | Speech-to-text: $0.37 per audio hour |
| Nano (STT) | $0.120 | $0 | 0 | Budget | Budget STT: $0.12 per audio hour |