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Head-to-head · AI Voice Agents

Deepgram Voice Agent API vs Vapi

  • Updated Oct 2026
  • Both researched from official sources
  • 6 checks side by side
Higher score Deepgram Voice Agent API #5 in AI Voice Agents 9.0/10 Paid ✓ 4 of 4 features Visit Deepgram
Vapi #6 in AI Voice Agents 8.9/10 Paid ✓ 4 of 4 features Visit Vapi

Deepgram Voice Agent API leads on 1 check, Vapi on 0, and 5 are even. Who comes out ahead on the 6 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreDeepgram Voice Agent API · 9.0/10

Deepgram Voice Agent API scores higher on our rubric for ai voice agents: 9.0 against 8.9 out of 10; our editors rank them #5 and #6.

Deepgram Voice Agent API leads on concurrent calls: 45 calls versus 10 calls.

Deepgram Voice Agent API is the better fit for developers building customizable voice infrastructure. Vapi is the better fit for teams building and operating phone agents via API.

  • Deepgram Voice Agent API fits best

    Developers building customizable voice infrastructure

  • Vapi fits best

    Teams building and operating phone agents via API

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Side by side

Feature Deepgram Voice Agent API 9.0/10 Visit ↗ Vapi 8.9/10 Visit ↗
At a glance
Editor score 9.0 8.9
Ranking #5 in AI Voice Agents #6 in AI Voice Agents
Best for Developers building customizable voice infrastructure Teams building and operating phone agents via API
Pricing model Paid Paid
Starting price $0.06 usage-based $29/mo
Free plan — —
Free trial — —
Deployment Cloud, Self-hosted Cloud, Mobile
Platforms Web Web, iOS
Integrations 11 integrations 20 integrations
Features Deepgram Voice Agent API 4/4 · Vapi 4/4
Inbound calls ✓ ✓
Outbound calls ✓ ✓
Human handoff ✓ ✓
Custom phone numbers ✓ ✓
Specs
Supported languages Not checked yet Not checked yet
Concurrent calls 45 calls (best) 10 calls
Our review
Pros
  • One WebSocket pipeline combines speech recognition, LLM processing and speech output.
  • Choose LLM and TTS providers, with function calling and turn-taking controls.
  • Supports inbound and outbound telephony plus self-hosted deployment.
  • Supports inbound, outbound, and web voice calls with live handoffs.
  • Lets teams configure speech, language-model, and text-to-speech providers.
  • Includes simulations, concurrency controls, monitoring, APIs, and SDKs.
Cons
  • Requires development work to configure and build voice-agent applications.
  • Per-minute pricing varies by tier and provider choices.
  • Custom - BYO LLM + TTS has no listed per-minute rate.
  • Usage-based billing can include provider and telephony costs.
  • Core limits included phone numbers and concurrent calls compared with Pro.
  • Pro starts at $999 per month; Premier pricing is custom.
Our verdict

Deepgram Voice Agent API gives developers a streaming foundation for real-time voice applications, combining speech-to-text, LLM orchestration and text-to-speech over a single WebSocket connection. It is aimed at developers and enterprises…

Read the review →

Vapi is a developer platform for building, deploying, and monitoring voice AI agents across phone and web calls. Its API and SDK access, configurable speech and language-model providers, and call controls suit teams creating…

Read the review →
  1. Deepgram Voice Agent APIAI Voice Agents 9.0Paid
  2. VapiAI Voice Agents 8.9Paid

Strengths and trade-offs

  • Deepgram Voice Agent API — where it wins

    • One WebSocket pipeline combines speech recognition, LLM processing and speech output.
    • Choose LLM and TTS providers, with function calling and turn-taking controls.
    • Supports inbound and outbound telephony plus self-hosted deployment.

    Where it doesn't

    • Requires development work to configure and build voice-agent applications.
    • Per-minute pricing varies by tier and provider choices.
    • Custom - BYO LLM + TTS has no listed per-minute rate.

  • Vapi — where it wins

    • Supports inbound, outbound, and web voice calls with live handoffs.
    • Lets teams configure speech, language-model, and text-to-speech providers.
    • Includes simulations, concurrency controls, monitoring, APIs, and SDKs.

    Where it doesn't

    • Usage-based billing can include provider and telephony costs.
    • Core limits included phone numbers and concurrent calls compared with Pro.
    • Pro starts at $999 per month; Premier pricing is custom.

More comparisons

All AI voice agents comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update