Muse Code
Meta's terminal coding agent, released in beta in August 2026 and powered by the Muse Spark 1.2 model.
Muse Code is Meta’s entry into the coding agent race, released in beta for macOS and Linux in August 2026. It runs in your terminal rather than a chat window, and takes on whole software tasks: planning a change, writing the code, then checking whether it works. It is powered by Muse Spark 1.2, a coding-focused model that Meta trained together with the agent itself.
Two ideas set it apart. Background agents stay alive for a whole session instead of being created per task, so they do not re-read the same files repeatedly. And every action gets written to a local log, so a job that crashes after hours of work resumes exactly where it stopped. It competes directly with Claude Code and Codex.