---
id: "2026-07-01-xai-grok-voice-agent-builder"
url: "https://postcutoff.com/e/2026-07-01-xai-grok-voice-agent-builder/"
as_of: "2026-11-13T13:49:00+01:00"
date: "2026-07-01"
date_precision: day
category: product
importance: 2
confidence: medium
status: [Partly confirmed]
sources: 3
editor: human editor
human_review: null
version: "2026-10-04"
---

As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/e/2026-07-01-xai-grok-voice-agent-builder/

# xAI launches Grok Voice Agent Builder, a no-code platform for phone voice agents

Full title: xAI launches Grok Voice Agent Builder, a no-code platform for phone voice agents (beta)

On 2026-07-01 xAI (branded SpaceXAI) released the Grok Voice Agent Builder in beta: a browser-based, no-code tool that turns a plain-language description of a phone call into a live voice agent running on its single Grok Voice speech-to-speech model, with telephony, knowledge retrieval, tools/MCP, guardrails and call review bundled.

## Key facts
- Launch 2026-07-01, beta (x.ai news post); 'Create a personalized voice agent in under 2 minutes without a single line of code'
- Runs on one Grok Voice speech-to-speech model rather than a stitched STT -> LLM -> TTS pipeline
- Price: the x.ai post (read 2026-09-29) lists $0.08 per minute of audio (API rate) plus $0.01/min telephony on a provisioned number, no platform fee; Slator (2026-07-07) reported 'from $0.05 per minute'. The discrepancy is unresolved
- 25+ languages; voice cloning; integrations incl. Google/Outlook Calendar, email, web and X search, Linear, Notion, Google Drive, OneDrive; human transfer; SIP or phone-number deployment
- xAI-reported tau-voice Bench: Grok Voice Think Fast 1.0 67.3% vs Gemini 3.1 Flash Live 43.8% and GPT Realtime 1.5 35.3%
- Competes with ElevenLabs (ElevenAgents), Retell AI, Vapi, Synthflow and PolyAI (Slator)

## What happened

xAI added a no-code layer on top of its Voice Agent API. Operators describe a call flow in plain language, attach documents and tools, test in the browser and deploy to a phone number or SIP trunk. Four weeks later (2026-07-29) the underlying model was upgraded to Grok Voice Think Fast 2.0.

## Why it matters

Frontier labs moved into the voice-agent platform market that had belonged to ElevenLabs, Vapi and Retell. xAI's pitch was a single end-to-end speech model with telephony bundled, instead of a cascade built from several vendors. The per-minute price is unclear (see key facts), so confidence is medium.

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): 62 days after its cutoff
- Claude Opus 5.5 (training cutoff June 2026): 1 day after its cutoff
- Gemini 4 Hydrogen (training cutoff March 2026): 92 days after its cutoff
- Grok 4.7 (training cutoff May 2026): 31 days after its cutoff

## Sources

1. [SpaceXAI: Introducing the Voice Agent Builder](https://x.ai/news/grok-voice-agent-builder) (x.ai, official)
2. [SpaceXAI: Voice Agent Builder product page](https://x.ai/voice) (x.ai, official)
3. [Slator: xAI Releases No-Code Voice Agent Builder](https://slator.com/xai-releases-no-code-voice-agent-builder/) (slator.com, press)

## Changes

- 2026-09-29 (filed): Created

## Related

- 2026-07-29: [xAI releases Grok Voice Think Fast 2.0 speech-to-speech model for voice agents](https://postcutoff.com/e/2026-07-29-grok-voice-think-fast-2/index.md)