Overview
- Muse Code is available in beta and runs on Muse Spark 1.2, using background subagents that stay active through entire work sessions and a local append‑only event log so interrupted runs can resume without losing edits.
- Meta published pay‑as‑you‑go token prices of $1.25 per million input tokens and $4.25 per million output tokens while offering a much cheaper Contributor tier that asks developers to opt in to allow Meta to use their coding sessions for model training.
- Early benchmark reports show mixed results for Muse Spark 1.2, with an 82.9% pass rate on Terminal‑Bench 2.1 but weaker performance on DeepSWE 1.1, and reviewers say the agent harness often outperforms the raw model for long, tool‑driven workflows.
- Enterprise leaders and security experts say they will likely restrict Muse Code to non‑sensitive work because connecting persistent agents to CI/CD raises IP, data privacy, identity and access, and cost‑forecasting concerns.
- This release extends Meta’s push from open source toward paid AI products and could shift where developers use agents by making low‑risk open source, prototypes, and personal projects the likeliest early adopters unless clear zero‑data‑retention terms and CI/CD safeguards appear.