What is Grok Voice Agent?
Voice agents on Grok, by API or a no-code builder with telephony.
Who is Grok Voice Agent best for?
Grok Voice Agent is best for teams building phone agents that need live search and many languages.
Customer support phone lines
Calls reach the agent over SIP from Twilio, Telnyx, Plivo or your own carrier, and it can transfer a caller to a person.
Assistants that need live facts
Built-in web search and X search sit beside your own functions and MCP servers, so the agent can look things up while it talks.
Apps built on OpenAI Realtime
The API follows the OpenAI Realtime format, so switching takes a new base URL, API key and voice model, and LiveKit and Pipecat already support it.
Brands that want their own voice
Besides built-in voices such as Ara, Eve and Leo, you can clone up to 30 custom voices from short clips at no extra charge.
How much does Grok Voice Agent cost?
Grok Voice Agent is billed per use on the xAI API: a speech-to-speech session costs $0.08 per minute of audio ($4.80 an hour), plus $0.004 per text input, paid from prepaid API credits.
- $4.80 per hour of audio
- $0.004 per text input
- The rate for live voice agents, on Grok Voice Think Fast 2.0
- $0.20 per hour when streaming
- Separate transcription endpoint
- Same voice roster as the voice agents
- Separate endpoint for spoken audio from text
Usage comes out of prepaid xAI API credits; auto top-ups start at $5, and monthly invoicing is available on request. Up to 30 custom voices can be cloned for free in the console. Phone calls arrive over your own SIP trunk, so numbers come from your carrier (Twilio, Telnyx, Plivo or another), not from xAI. Prices are in US dollars. Full pricing on docs.x.ai. We checked these prices on .
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What are the best Grok Voice Agent alternatives?
Three tools on Recaply do Grok Voice Agent's job.
Questions about Grok Voice Agent
What is Grok Voice Agent?
Voice agents on Grok, by API or a no-code builder with telephony.
Who is Grok Voice Agent for?
Grok Voice Agent is best for teams building phone agents that need live search and many languages.
Is Grok Voice Agent free?
No. Grok Voice Agent is a paid tool, from $0.08 per minute of audio.
How much does Grok Voice Agent cost?
Grok Voice Agent's paid plans are Speech to Speech at $0.08 per minute of audio, Speech to Text at $0.10 per hour of audio and Text to Speech at $15.00 per million characters.
What are the best Grok Voice Agent alternatives?
The closest alternatives on Recaply are Vapi, Ultravox.ai and Synthflow AI.
Where can I try Grok Voice Agent?
On its official website, x.ai.
Is Grok Voice Agent compatible with the OpenAI Realtime API?
Yes. Grok Voice Agent follows the OpenAI Realtime API format, so an existing Realtime app mostly needs a new base URL, an xAI API key and a Grok voice model. A few xAI additions, such as making the agent say an exact line of text, are not part of OpenAI's version.
Does Grok Voice Agent charge for custom voices?
No. Grok Voice Agent lets you clone up to 30 custom voices in the xAI console at no charge, each from a reference clip of up to 120 seconds. A cloned voice then works in voice agents and text to speech like a built-in one, at the normal usage rates.
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