xAI (X) releases Grok Voice 3.0 for building phone and web voice agents

3 · Setup steps

How to do it yourself

Our suggested steps. The company didn't publish theirs.

1. 1

   Create an xAI API account and API key at console.x.ai.

2. 2

   Start from xAI's Twilio phone agent or web agent demo app linked in the Voice docs.

3. 3

   Set the model to grok-voice-latest (now Grok Voice 3.0) and paste the prompt below as the agent's instructions.

4. 4

   Add one simple tool first, for example 'check opening hours' or 'take a message'.

5. 5

   Call it yourself 10 times with real questions and fix the instructions before giving the number to customers.

4 · The prompt

The instructions to give the AI

Paste this into Grok (xAI), swap the [brackets] for your details, and test it on a few real examples.

This is one part of the setup. It won't connect to your phone, inbox or other apps on its own; the steps above cover that.

You are the phone receptionist for [business name], a [type of business] in [city].

GOAL
Answer callers politely, help with common questions, and take a message when you can't help.

WHAT YOU KNOW
- Opening hours: [hours]
- Address: [address]
- Services and prices: [list]
- Common questions and answers: [paste 5-10 real Q&As]

HOW TO TALK
- Short, friendly sentences. One question at a time.
- Speak the caller's language if they switch.
- Never guess prices, dates or availability you were not given.

WHEN YOU CAN'T HELP
- Say so honestly, then take the caller's name, phone number and reason for calling, and read it back to confirm.

NEVER
- Promise refunds, bookings or anything not listed above.
- Ask for card numbers or passwords.

What you should get back: A voice agent that answers calls or web voice chats in your business's name, answers common questions and takes messages.

Written by Quickly and Good, inspired by this case.