$META Releases Muse Code in Beta, an AI agent for Large Code Bases

Meta released Muse Code, a terminal agent powered by Muse Spark 1.2 that handles large repos with persistent agents and parallel sub-agents in isolated worktrees. Muse Code, which is currently available in beta, can accomplish “complete software engineering tasks across large repos,” Meta CEO Mark Zuckerberg Code, which can be installed with a single command, is powered by Meta’s previously released coding model, Muse Spark. It handles large projects by launching its own agents, which then work simultaneously. “When a job is big enough, it fans out to separate sub-agents working in parallel in isolated worktrees,” Zuckerberg explained. “Your working copy is never touched. In testing we had it build six features for a game simultaneously with no collisions.” Spark 1.2 scored 82.9% on Terminal-Bench 2.1, just behind Opus 5 at 86.7%