Muse Code

Meta Superintelligence Labs entered the terminal agent race on August 5, 2026 with Muse Code, a beta CLI built around the Muse Spark 1.2 model, which was trained alongside the tool itself. The agent plans, edits, and validates changes across large repositories by coordinating persistent asynchronous subagents that keep working in the background throughout a session, each in its own isolated working tree, with approval gates before risky actions land. Every model call, tool run, approval, and file edit is appended to a local event log, so a crashed or interrupted session can be restarted or replayed exactly. Bundled skills include /plan for task planning, /grill for stress-testing a change, and /goal for driving work toward an objective. A single curl script installs it on macOS and Linux. The model is closed and usage is metered: the standard tier costs 1.25 dollars per million input tokens and 4.25 dollars per million output, while a contributor tier drops to 0.10 and 0.20 in exchange for letting Meta train on prompts and completions.