Grok Build CLI running in a terminal, showing the agent editing a TSX file with its plan and output interface Screenshot: GIGAZINE / xAI
by VibecodedThis

xAI Enters the Coding Agent Race With Grok Build

xAI launched an early beta of Grok Build on May 15, a terminal-based agentic coding CLI powered by Grok 4.3. It's available now to SuperGrok Heavy subscribers at an introductory price, with plans for broader access.

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xAI launched an early beta of Grok Build on May 15, its first coding agent and the company’s direct answer to Claude Code, Codex CLI, and Gemini CLI. The tool runs from your terminal, takes natural language instructions, and carries out multi-file software engineering tasks on your local machine.

Elon Musk pushed the announcement publicly on May 14, posting calls for beta testers on X before the official product page went live at x.ai/cli. The official announcement landed the following day with a detailed breakdown of features.

What Grok Build actually does

Grok Build is an agentic CLI, meaning it takes action rather than just generating text. It can plan projects, write and edit files, execute shell commands, and build complete applications from a description. That puts it in the same category as Claude Code and Codex CLI rather than a chat interface like Cursor.

The default flow is plan-first. Start a task and Grok Build writes a structured plan, file by file, step by step. You can approve it, comment on individual steps, or rewrite it entirely before any code is touched. Once you approve, changes come back as diffs that you review before they land. This is a sensible default for an early beta where trust in the model hasn’t been established yet.

For larger tasks, Grok Build can delegate work to parallel subagents, up to 8 running simultaneously. The underlying model is Grok 4.3 beta, which uses a 16-agent Heavy architecture and a 2 million token context window. That context size should handle most real codebases without chunking.

Other notable features from the announcement:

  • Headless mode (-p flag) for running Grok Build inside scripts and automation pipelines
  • ACP support for building bots and agent orchestration apps on top of it
  • VS Code integration for developers who want a GUI alongside the terminal
  • AGENTS.md, plugins, hooks, skills, and MCP servers all load automatically from your repository

The CLI also accepts /feedback commands that send reports directly to the xAI team during the beta period.

Pricing and availability

Grok Build is currently exclusive to SuperGrok Heavy subscribers. The tier is priced at $299 per month, but xAI is offering an introductory rate of $99 per month for the first six months. That’s a steep entry point compared to Claude Code ($100/month with Anthropic Max, or metered on the API) and Codex CLI (included with ChatGPT Pro at $200/month or API access).

xAI hasn’t said when it will open access to other subscription tiers.

Context

xAI has been explicit about being behind on coding. Musk acknowledged the gap publicly earlier this year, and the company directed staff to focus on closing it. Grok Build is the result.

The timing puts xAI entering the CLI coding agent market roughly 12 to 18 months after Anthropic and OpenAI established their tools, and several months after Google’s Gemini CLI went open source. Whether the Grok 4.3 model can close the benchmark gap is something the beta period will surface. The $99 introductory price is aggressive enough to get developers to try it, and the plan-review workflow suggests xAI is aware that trust matters more than raw capability at launch.

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