Overview
- Muse Code launched in beta on Wednesday, August 5, 2026, as a terminal coding agent for macOS and Linux that installs with a one-line command and aims to manage end-to-end engineering tasks across large repositories.
- The tool uses persistent background subagents to run continuously during a session and a local event log that records every model call, tool run, approval, and edit so runs are replay‑exact and restart‑safe after crashes.
- Muse Spark 1.2 is a coding‑focused model update available in Muse Code and through the Meta Model API with expanded global access, and Meta says it co‑trained the model with Muse Code to improve agent pairing and long‑horizon task performance.
- Meta published API pricing that charges $1.25 per million input tokens and $4.25 per million output tokens and added a lower‑cost contributor tier that the company says is over ten times cheaper while offering an opt‑in limited data retention option for enterprise customers.
- Meta presented internal case studies showing the agent iteratively optimized GPU kernels over 1,000+ tool calls and claimed substantial gains, but broad developer testing and independent benchmarks will be needed to verify real‑world accuracy, cost and safety for long, multi‑step workflows.