Meta just shipped the beta version of its first coding agent.

Muse Code is the agent system around Muse Spark 1.2, adding planning, tools, persistent session context, parallel sub-agents, and automatic validation.

So it can handle one large software task for hours without needing a human to prompt every next step.

• Scores 82.9% on Terminal-Bench 2.1 against 86.7% for Claude Code running Opus 5.

• On DeepSWE 1.1 it lands at 59.3%, behind Opus 5 (65.0%) and GPT 5.6 Terra (64.8%).

• installs with one command

• You get background agents that stay alive for the whole session and accumulate context, instead of restarting cold on every task.

• When a job grows big enough, the work fans out to sub-agents running in parallel inside isolated worktrees.

• Every model call, tool run and edit hits a local event log before it executes, so a crash resumes from the last entry with nothing re-prompted.

• That durability is why it could run 1,000+ tool calls over 24 hours on NVIDIA Hopper and keep finding kernel improvements deep into the session.

• Pricing matches Muse Spark 1.1: $1.25/$4.25 per million input/output tokens