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.
This comparison is generated from the sourced Deepgram and PolyAI profiles. Open either profile to review its evidence and last-reviewed date.