Deepgram vs PolyAI
A side-by-side comparison of capabilities, autonomy, integrations, and pricing to help you choose.
Short answer: choose Deepgram if you want voice ai infrastructure: speech-to-text, text-to-speech, and a voice agent api (Assistant, usage); choose PolyAI if you want enterprise voice ai agents that answer and resolve customer calls (Supervised agent, usage).
| Deepgram | PolyAI | |
|---|---|---|
| What it is | Voice AI infrastructure: speech-to-text, text-to-speech, and a voice agent API | Enterprise voice AI agents that answer and resolve customer calls |
| Type | platform | platform |
| Autonomy | Assistant | Supervised agent |
| Pricing | usage · $0.0048/min (Nova-3 streaming STT) | usage |
| Best for | developers, enterprise | enterprise, mid-market |
| Deployment | saas, api, self-hosted, on-prem | saas, api |
| Modalities | voice, text, api, code | voice, text, api |
| Models | proprietary | proprietary |
| Protocols | rest-api, function-calling | mcp, rest-api, function-calling |
| Integrations | Twilio, LiveKit, Vapi, Amazon SageMaker | Five9, NICE CXone, Twilio, Amazon Connect, Genesys, Salesforce |
| Capabilities | 4 documented | 4 documented |
Deepgram
- +Mature, competitive STT (Nova) with low per-minute pricing and strong streaming
- +Rare true self-hosted, on-prem, and air-gapped options for regulated and government use
- +A single Voice Agent API collapses the STT-LLM-TTS stack
- -Infrastructure, not a finished product: you build the agent and UX yourself
- -The Voice Agent API is materially pricier, and connection-time billing can surprise
PolyAI
- +Strong, natural voice quality proven on hard and regulated call types
- +Deep CCaaS and CRM integration plus a proprietary model stack with enterprise compliance
- +Real enterprise traction and NVIDIA backing
- -Opaque, high-floor pricing inaccessible to SMBs
- -Historically heavy managed-service implementation; the self-serve story is newer
Which should you choose?
Deepgram is voice ai infrastructure: speech-to-text, text-to-speech, and a voice agent api, best for developers, enterprise. PolyAI is enterprise voice ai agents that answer and resolve customer calls, best for enterprise, mid-market. The right choice depends on the autonomy level you want, your existing integrations, and your budget, all compared above.