Grok Build: xAI Reveals Agentic Coding CLI with Arena Mode and Parallel Agents

X/Twitter·medium signal

xAI revealed Grok Build's feature set: local-first CLI with up to 8 parallel agents per session, Arena Mode for algorithmically comparing agent outputs before human review, worktrees, Yolo mode, and native GitHub integration. Built on grok-code-fast-1 at $0.20/$1.50 per million tokens. Still not publicly released after Musk's April 16 'next week' deadline, but feature traces suggest imminent launch.