AssemblyAI
Great when you need STT + audio intelligence features. Deepgram usually wins raw $/min STT.
Great when you need STT + audio intelligence features. Deepgram usually wins raw $/min STT. Strengths: Excellent speech understanding add-ons; Developer DX; Voice agent packaging.
Lock-in risk: higher = more lock-in (worse). Overall already inverts this dimension.
Great when you need STT + audio intelligence features. Deepgram usually wins raw $/min STT.
Strengths
- · Excellent speech understanding add-ons
- · Developer DX
- · Voice agent packaging
Weaknesses
- · Often pricier than Deepgram raw STT
- · Voice agent bundle math varies
- · Less TTS depth
Pricing notes
As of 2026-09-14: Async Universal tiers roughly $0.15–$0.21/hr; realtime higher (~$0.45/hr class); Voice Agent API ~$4.50/hr all-inclusive packaging on public pages. New accounts often get ~$50 credits. Strong LLM-ready transcript features (summaries, PII redaction).
Sourced pricing
Contract status unit_mismatch · unit_mismatch. Single normalized $/1M: null. Machine list: /api/pricing?provider=assemblyai
- Voice Agent API · usd_per_hour · $4.5 · unit_mismatch · normalized null
- Universal-3.5 Pro async speech-to-text · usd_per_hour · $0.21 · unit_mismatch · normalized null
- Universal-2 async speech-to-text · usd_per_hour · $0.15 · unit_mismatch · normalized null
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