Grok Build

Grok Build

Grok Build is xAI's coding agent for the terminal, and the working environment around Grok models rather than a chat window on top of them. Grok Build ships a full-screen, mouse-interactive TUI for back-and-forth sessions, a plan mode that proposes changes as diffs and waits for approval, parallel subagents that can work different parts of a codebase at once, and a headless mode for running the agent in CI. xAI open-sourced the project in July 2026, so the agent loop, file-editing tools, terminal UI and extension system are all public.

Production credibility: xAI shipped Grok Build on 14 May 2026, added a Windows PowerShell installer on 25 May 2026, open-sourced the project on 15 July 2026 at github.com/xai-org/grok-build, and cut a V1.0 release in August 2026 — a move from rapid iteration to a stable cadence. Early access was tied to SuperGrok Heavy accounts at roughly $300 a month with a $99 introductory price; the CLI itself is open source, while the models it calls are billed through an xAI account.

Key Features

• Full-screen, mouse-interactive terminal UI for structured sessions
• Plan mode that presents diffs and waits for human approval before editing
• Parallel subagents working different parts of a codebase at once
• Headless mode for running the agent inside CI pipelines
• Extension system for adding tools to the agent loop
• Open source, with installers for macOS, Linux and Windows PowerShell

Ideal Use Case

Developers already paying for Grok who want the model in their terminal, and teams that want an open agent framework they can extend or run headless in CI. Plan mode makes it usable on repositories where unreviewed edits are unacceptable, and the subagent support suits larger refactors that split cleanly into parts.

How Grok Build differentiates

Grok Build is the xAI entry in the terminal-agent category, and its distinguishing choices are the interface and the licence: a genuine full-screen TUI rather than a scrolling prompt, and an open repository covering the whole tool. Against Claude Code and Codex it trades ecosystem maturity for transparency and CI-friendliness; against Aider it trades a lighter footprint for a richer interface and subagents. Model access still runs through an xAI subscription, so what is open source is the tooling, not the model.

FAQ

Q: What is Grok Build? A: Grok Build is xAI's terminal coding agent. It provides a full-screen TUI, a plan mode that shows diffs before editing, parallel subagents and a headless mode for CI.

Q: Is Grok Build open source? A: Yes. xAI published the source on 15 July 2026 at github.com/xai-org/grok-build, covering the agent loop, file-editing tools, terminal UI and extension system.

Q: How much does Grok Build cost? A: The CLI itself is open source and free. Model access is billed through an xAI account; early access was tied to SuperGrok Heavy at roughly $300 a month, with a $99 introductory price.

Q: Does Grok Build run on Windows? A: Yes. xAI shipped a Windows PowerShell installer on 25 May 2026, alongside macOS and Linux support.

Q: What is plan mode in Grok Build? A: Plan mode has the agent propose its changes as clean diffs and wait for human approval before modifying files, rather than editing the repository directly.

tl;dr

Grok Build is xAI's open-source terminal coding agent: full-screen TUI, plan mode with diff approval, parallel subagents and headless CI runs. Shipped May 2026, open-sourced in July, V1.0 in August. Free tooling, xAI subscription for the models.