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Grok Voice Agent API

15 voice-agent/xAI/ACTIVE/aka Grok Voice

Grok Voice Agent API is xAI's speech-to-speech platform for production voice agents — full-duplex turns under ~700ms, tool calling and live search mid-conversation, telephony via SIP or a provisioned number, plus a no-code Voice Agent Builder in beta.

SEC.01

What it does

  • 01Speech-to-speech pipeline, sub-second turns
  • 02OpenAI Realtime API-compatible spec
  • 03Tool calling + live search mid-call
  • 04Telephony: SIP trunking or free provisioned number
  • 05Voice Agent Builder (no-code, beta)
  • 06LiveKit, Twilio, Pipecat, WebRTC templates
SEC.02

Who it's for

Teams shipping high-volume voice agents who want one vendor for the speech stack instead of stitching STT/LLM/TTS.

PRICING

Pricing

$0.08/min agent audio; telephony +$0.01/min; STT $0.10-0.20/hr; TTS $4.20/M chars. List prices as checked against the vendor's pricing page on 2026-09-25; plans change often, so confirm before deciding.

caveat · before you adopt

Younger ecosystem than the stitched-stack incumbents; telephony billed separately and voice-agent pricing is per audio minute.

ALT

Other voice agents (6)

Vapi

Vapi · voice-agent

api/voice · cloud · Usage-based: ~$0.05/min platform fee + model/telephony costs

Bland AI

Bland AI · voice-agent

api/voice · cloud · Usage-based per-minute; enterprise plans

Retell AI

Retell AI · voice-agent

api/voice · cloud · Usage-based (~$0.07+/min); enterprise plans

Synthflow

Synthflow · voice-agent

api/voice · cloud · Plans from ~$29/mo; per-minute overages

ElevenLabs Agents

ElevenLabs · voice-agent

api/voice · cloud · Included in ElevenLabs plans; per-minute credits

Deepgram Voice Agent

Deepgram · voice-agent

api/voice · cloud · Pay-as-you-go per-minute (~$0.08/min) — verify
VENDOR

More from xAI

Grok Build

xAI · cli-agent

cli/editor/api · local · Free to try; SuperGrok $30/mo or X Premium+ $40/mo; API grok-4.6 $2/M in · $6/M out
FAQ

Frequently asked

What is Grok Voice Agent API?

Grok Voice Agent API is xAI's speech-to-speech platform for production voice agents — full-duplex turns under ~700ms, tool calling and live search mid-conversation, telephony via SIP or a provisioned number, plus a no-code Voice Agent Builder in beta.

Who is Grok Voice Agent API for?

Teams shipping high-volume voice agents who want one vendor for the speech stack instead of stitching STT/LLM/TTS.

How much does Grok Voice Agent API cost?

$0.08/min agent audio; telephony +$0.01/min; STT $0.10-0.20/hr; TTS $4.20/M chars. List prices as checked against the vendor's pricing page on 2026-09-25; plans change often, so confirm before deciding.

Does Grok Voice Agent API run locally or in the cloud?

Grok Voice Agent API runs in the vendor's cloud. Its interfaces are an API or protocol, a live voice/phone channel.

What are alternatives to Grok Voice Agent API?

Other voice agent entries in the catalog: Vapi, Bland AI, Retell AI, Synthflow, ElevenLabs Agents, Deepgram Voice Agent. Different categories solve the same problem differently — see the Voice & phone agents category page for tradeoffs.

What should I know before adopting Grok Voice Agent API?

Younger ecosystem than the stitched-stack incumbents; telephony billed separately and voice-agent pricing is per audio minute.