AssemblyAI Cost Calculator
Estimate AssemblyAI speech spend. Async Universal-3.5 Pro ($0.21/hr) or Universal-2 ($0.15/hr); streaming Universal-3.6 Pro Realtime ($0.45/hr) or Universal-Streaming ($0.15/hr) billed by WebSocket session duration including idle time. Optional TTS ($15 per 1M characters), Medical (+$0.15/hr), and diarization (async +$0.02, streaming +$0.12). Estimates only; official AssemblyAI pricing prevails.
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STT cost
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Add-on cost
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TTS cost
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Effective hourly rate
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Monthly USD
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Estimates only; official vendor pricing prevails (2026-10-30). Async: U3.5 Pro $0.21/hr, Universal-2 $0.15/hr. Streaming: U3.6 Pro Realtime $0.45/hr, Universal-Streaming $0.15/hr — billed by WebSocket session duration (incl. idle). TTS $15/1M chars. Medical +$0.15; diarization async +$0.02, streaming +$0.12.Official pricing: AssemblyAI
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How it works
- How is streaming billed?
- By WebSocket session duration—open-to-close time, including idle. Close connections when calls end.
- What are the core hourly rates?
- Async U3.5 Pro $0.21/hr, Universal-2 $0.15/hr; streaming U3.6 Pro Realtime $0.45/hr, Universal-Streaming $0.15/hr.
- Which add-ons are included?
- Medical +$0.15/hr; diarization async +$0.02/hr or streaming +$0.12/hr; optional TTS $15 per 1M characters.
- Are results invoices?
- No. Estimates only; assemblyai.com/pricing prevails.
- Is any data uploaded?
- No. These calculators and QR codes run in your browser.