Meta is entering the AI coding-agent race with Muse Code, a new terminal-based tool now available in beta for macOS and Linux.

Powered by the new Muse Spark 1.2 model, it is designed to handle complex software engineering work across large repositories.

For Mac users, Muse Code installation is a one-line command:

curl -fsSL https://dev.meta.ai/install.sh | bash

Unlike ChatGPT Codex and Claude Code, there’s currently no dedicated app interface for Muse Code.

Meta says Muse Code can plan changes, write code, validate its work, and coordinate persistent background agents that remain active throughout a session.

Its local event log records model calls, tool use, approvals, and edits, allowing work to resume after a crash. Built-in commands can also generate a plan, stress-test it, or continue working toward a specified goal.

Muse Spark 1.2 is described as a coding-focused update with gains in code generation, debugging, codebase understanding, and long-running developer workflows.

The model is available through both Muse Code and the Meta Model API with expanded global access.

The release follows Meta’s July launch of Muse Spark 1.1, which upgraded the model’s agentic and multimodal abilities and introduced Meta’s paid API service for developers.

Before that, Meta replaced Llama with the original Muse Spark in April, then used it to expand the Meta AI app and power new image-generation features across Meta’s apps.