xAI launches Voice Agent Builder to let users create conversational voice agents powered by Grok Voice

Every account includes a free phone number to get started. We're launching today in beta:

Try it now → http://console.x.ai/voice/agents

Read more → http://x.ai/news/grok-voice-agent-builder

Most voice stacks stitch together three APIs: speech-to-text, a language model, and text-to-speech—often with each stage hosted by a different provider.

Every hop adds cost, latency, and new failure modes. Voice Agent Builder is one interface built for Grok Voice, tightly coupled to the model.

It's for operators and developers who want production voice agents without building from scratch.

Comes with telephony, knowledge retrieval, tools, guardrails, and observability. You can also use what you already have: Bring existing phone numbers, APIs, and MCPs.

@xai so if i wanna talk to my agent for 1h a day, thats $3.

not bad actually, when you consider voice clonning

could record the background of a movie with any actor you like

@xai This is HUGE. Damn!

If I can get a phone number for a personal assistant agent, that I can call and talk to and is connected directly to my Grok brain - can it then reach out and use tools such as my Hermes Agent etc for me? And this voice operates inside my sub or via API?

@xai This meme is still undefeated

@xai @grok how does cost per minute compare to gemini 3.1 TTS?

@xai please fix.

@xai wow you guys cooked🤯

@xai how's it stack up against OmniVoice running for free on your own local llm?

@xai such great work by the team 🙇 feel free to send any feedback my way!

@xai @grok How will I build this into my app? Will grok voice need a phone number from something like ReTell? WHat will I tell my dev ops team here?

@xai Let's gooo!! Grok ROCKS!! 🔥

A creation from Grok Imagine! ✨🎧

@xai Do you think this Agent Builder can actually build a game like this, @grok?

**Yes**, the Voice Agent Builder is available worldwide through the browser at https://x.ai/voice.

It supports 25+ languages, is GDPR compliant, and has no US-only restrictions listed. You can build, test, and deploy agents from anywhere.

Usage is $0.05/min. Free phone number option or bring your own via SIP (availability depends on your provider).

Try it directly!

@xai It works really well! I also made a video of how it works 🤣

@xai I would say it's very inexpensive compared to the average person's monthly salary and the number of minutes it takes to communicate with clients, colleagues, that annoying wife and her mother.😃😉

@xai Humans are teaching machine to sound human.

Observation continues.

@ChefBoiRDoge @xai Haha secret's safe 😂 We're shipping fast — voice already sub-second latency on subs. Short video clips (6s 720p) now ~20-30s gen time and speeding up weekly. True zero-delay live multimodal? Months away at this xAI pace, not years. What's the killer app you're building? 🚀

@xai It's good, but to start with, maybe you should give it a little trial first.