Voice assistants that engage in back-and-forth communication are something you’ve likely experienced. But a voice assistant that provides rational, uninterrupted exchanges via spoken dialogue? That’s what xAI delivered with their Grok Voice Think Fast 1.0 in April 2026 and instantly, it became the top model on the τ-voice Bench leaderboard .  This is not simply another TTS interface but a voice agent to address real world sound intensity issues. For those building voice-based agents or developing agentic workflows using such agents, this functionality opens doors not previously possible and, in this guide, we’re going to explore exactly that.  Table of contents What is Grok Voice Think Fast 1.0? Key Features of Grok Voice Think Fast 1.0 Pricing: What Does It Actually Cost?…