# Grok Voice Agent API [15 voice-agent](https://www.agentlist.io/categories/voice-agent)/[xAI](https://www.agentlist.io/ai/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. - [Voice I/O](https://www.agentlist.io/capabilities/voice) - [Tool calling](https://www.agentlist.io/capabilities/tool-calling) - [API-native](https://www.agentlist.io/capabilities/api-native) - [Human handoff](https://www.agentlist.io/capabilities/human-handoff) 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](https://www.agentlist.io/systems/vapi) [Bland AI Bland AI · voice-agent api/voice · cloud · Usage-based per-minute; enterprise plans](https://www.agentlist.io/systems/bland) [Retell AI Retell AI · voice-agent api/voice · cloud · Usage-based (~$0.07+/min); enterprise plans](https://www.agentlist.io/systems/retell) [Synthflow Synthflow · voice-agent api/voice · cloud · Plans from ~$29/mo; per-minute overages](https://www.agentlist.io/systems/synthflow) [ElevenLabs Agents ElevenLabs · voice-agent api/voice · cloud · Included in ElevenLabs plans; per-minute credits](https://www.agentlist.io/systems/elevenlabs-agents) [Deepgram Voice Agent Deepgram · voice-agent api/voice · cloud · Pay-as-you-go per-minute (~$0.08/min) — verify](https://www.agentlist.io/systems/deepgram-voice-agent) 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](https://www.agentlist.io/systems/grok-build) 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. Spec sheet **Name**: Grok Voice Agent API **Vendor**: [xAI](https://www.agentlist.io/ai/xai) **Category**: [Voice & phone agents](https://www.agentlist.io/categories/voice-agent) **Interfaces**: api · voice **Hosting**: cloud **Pricing**: $0.08/min agent audio; telephony +$0.01/min; STT $0.10-0.20/hr; TTS $4.20/M chars **Status**: actively maintained **Aliases**: Grok Voice **Record ID**: `sys://xai/grok-voice` **Verified**: [2026-09-25](https://www.agentlist.io/changelog) Sources - [↗ x.ai](https://x.ai/) - [↗ x.ai/api/voice](https://x.ai/api/voice) - [↗ x.ai/news/grok-voice-agent-api](https://x.ai/news/grok-voice-agent-api) Catalog entries are editorial records, not paid placements or endorsements. Pricing and status are approximate as of the seed date. --- Source: [Grok Voice Agent API — VOICE-AGENT by xAI | agentlist.io](https://www.agentlist.io/systems/grok-voice). This is the public page rendered as Markdown; interactive controls require the website.