Meta ships Muse Code agent powered by Muse Spark 1.2

Muse Spark 1.2 scores 82.9% on Terminal Bench 2.1 and 59.3% on DeepSWE 1.1 (up from 53.0%), ranking second only to Opus 5 on Meta's internal coding benchmark. The Muse Code beta agent adds planning, tools, persistent session context, parallel sub-agents, and automatic validation, and installs via curl.