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How-to3 min read

Grok Build in Mirasim: xAI's coding agent, next to your other agents

Grok Build is xAI's coding agent for the terminal. How to install it and sign in, and how to run it in Mirasim next to Claude Code and Codex.

Mirasim's agent picker open in a session, with Grok Build among the agentsMirasim's agent picker open in a session, with Grok Build among the agents

The short answer

Grok Build is xAI's coding agent. You use it in the terminal through its own full-screen interface, headlessly in scripts, or from other apps through the Agent Client Protocol (ACP). Mirasim is a desktop app that runs that same Grok Build as one of its ten agents. Mirasim is not an official xAI application.

Next to Claude Code and Codex
Grok Build in one pane, other agents in the next
Hand over mid-task
Switch a session to Grok Build and keep the conversation
On your phone
Read and reply away from your desk
With your team
Several people in one session

Use Mirasim when you want Grok Build in a desktop window, alongside other agents, on your phone, or in a session your team shares.

Install and sign in

Install
curl -fsSL https://x.ai/cli/install.sh | bash on macOS and Linux, or irm https://x.ai/cli/install.ps1 | iex in Windows PowerShell. In Mirasim, Agent Config runs the same installer for you.
Sign in
Run grok in a project. The first launch opens a browser to sign in; where there's no browser, set XAI_API_KEY. Mirasim uses the login you made and doesn't change it.
No xAI account
In Mirasim you can run Grok Build on Mirasim credit with the Grok models the platform offers. For prices, see mirasim.ai/pricing.

What Grok Build brings

  • MCP servers, hooks, skills and plugins.
  • Plan mode, permissions and a sandbox.
  • Subagents and background tasks.
  • Worktree sessions, each an isolated copy of the repository, so parallel agents don't overwrite each other's files.
  • Any custom model, added to Grok Build's config.toml.

Article · Claude Code alternatives: nine coding agents, and why you might not have to choose → Grok Build and the other agents you can run next to Claude Code.

Questions

Is Grok Build the same as Grok Bot?
No. Grok Build is xAI's coding agent for the terminal. Grok Bot gives each person named Bots that work across apps on a cloud computer. Mirasim runs Grok Build; for Grok Bot, see our comparison page.
Is Mirasim an official Grok Build app?
No. Grok Build is xAI's. Mirasim is a separate desktop app that runs it alongside other coding agents.
Does it work on Windows?
Yes. xAI ships a PowerShell installer, and Mirasim runs on Windows, macOS and Linux.
Can I use other models in Grok Build?
Yes. xAI's docs show adding any model, with its base URL and key, to Grok Build's config.toml and switching to it with /model.

Article · Mirasim vs Grok Bot: How to choose → Mirasim and Grok Bot compared.

Sources

The details about Grok Build were checked against xAI's documentation on November 8, 2026: docs.x.ai/build/overview and the Features and CLI pages under docs.x.ai/build. Grok Build changes quickly, so check those pages for the latest.

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