Muse Code: Meta’s terminal coding agent

Muse Code is the terminal coding agent Meta Superintelligence Labs released in beta on 5 August 2026. It runs on Muse Spark 1.2, coordinates persistent background subagents, appends every model call and every edit to a local event log, and installs with a single command on macOS and Linux.

September 2, 2026 13 min 3

Tools

Claude Code vs Codex CLI vs Muse Code in 2026

All three are terminal agents, but they bet on different things. On the official Terminal-Bench 4.0 board, published on 28 August 2026, Claude Code with Opus 5 solves 51.8% of trials at $18.09 each, and Codex with GPT-5.6 Sol solves 37.3% at $7.70. Muse Code appears on no board at all.

September 2, 2026 12 min 3