Muse Code

Muse Code is a coding assistant from Meta that runs inside a terminal window. Instead of a single question-and-answer exchange, it works more like a construction supervisor overseeing a full building renovation: it plans out work that can span multiple days, actually makes the changes, and then checks whether everything was done correctly, moving through all three stages on its own.

A key feature is that it keeps a set of helper workers around to split up tasks. Meta describes the setup as breaking a single job into smaller pieces handed off to sub-agents, which stay active throughout the task rather than disappearing partway through. The new model that actually powers the tool was announced alongside it under the name Muse Spark 1.2, though details like its size or performance figures haven't been disclosed yet.

That said, this introduction is based on a single short announcement from the company, so exactly who can access it, under what conditions, and at what price remain unconfirmed.

Articles distinguish the two by writing things like "powered by Muse Spark 1.2, a new model released alongside it," treating Muse Code as the name of the tool and Muse Spark as the engine running inside it. The two names are easy to mix up, but the difference is that Muse Code is the tool used in the terminal, while Muse Spark is the model that drives it.