xAI AI Updates: May 26, 2026

1. xAI opens the Grok Build CLI to all SuperGrok and X Premium Plus subscribers with plan mode, parallel subagents, and worktree support

xAI. xAI moved its Grok Build coding agent out of the SuperGrok Heavy-only tier and into early beta for every SuperGrok and X Premium Plus subscriber, expanding access to the same CLI it shipped in restricted form on May 20 alongside the grok-build-0.1 model. The CLI installs with a single command and ships a plan mode that drafts a step-by-step plan a user can approve, comment on individual steps of, or rewrite before any code is touched, after which every change lands as a reviewable diff. For larger jobs Grok Build can delegate to specialized subagents that run in parallel and supports deep worktree integration so each subagent operates in its own working copy. The grok-build-0.1 model behind the CLI has a 256K-token context window with $1.00 per million input tokens and $2.00 per million output tokens, putting xAI directly against Claude Code, Codex, and Antigravity for the agentic coding workflow. Source