Overview
AssemblyAI offers speech-to-text and speech-understanding models through an API. Pre-recorded transcription costs US$0.21 an hour with Universal-3.5 Pro or US$0.15 with Universal-2, while streaming costs US$0.15 an hour on Universal-Streaming and US$0.45 base on Universal-3.6 Pro Realtime, billed on connection time.[8] Add-ons such as speaker diarization, medical mode and key-term prompting are charged on top. New accounts receive US$50 in free credit without a card. PII redaction on Universal-2 works in 47+ languages.[8]
AssemblyAI strengths and limitations
Strengths
- Low hourly base rate
- Modular add-ons for medical, diarization and redaction
Limitations
- Streaming billed on connection time, not audio
- Language coverage per model is documented separately
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