Changelog

Shipping in the open.

Every release of the Muse Code CLI and the Muse Spark model, as it lands.

muse code betaAug 5, 2026BETA

Muse Code beta × Muse Spark 1.2

NEWMuse Code beta for macOS and Linux — one-command install, browser auth at dev.meta.ai

NEWPersistent async background agents — active all session, not spawned per task

NEWAgent fan-out: sub-agents work in parallel in isolated git worktrees

NEWAppend-only local event log — replay-exact, restart-safe after crashes

NEWBuilt-in /plan, /grill, and /goal commands

NEWZero-data-retention requests now accepted via Meta sales

muse-spark-1.2Aug 5, 2026MODEL

NEWCo-trained with the Muse Code harness — rejection-sampled agent trajectories, goal conditioning, context compaction

IMPROVEDOptimized for multi-file refactors, long debugging sessions, and tasks that run past a single prompt

IMPROVEDKernel case study: 1,000+ tool calls sustained over 24 hours

NEWContributor and standard variants; expanded global access to the public preview

muse-spark-1.1Earlier in 2026

NEWMeta Model API opens: OpenAI-SDK-compatible endpoint at api.meta.ai/v1

NEW1,048,576-token context window

NEWModel API cookbook: API fundamentals, agent patterns, and end-to-end use cases