Meta AI Research 2026-10-15-1
Introducing Muse Spark Open, The Most Capable US Open‑Weight Model to Date
Meta's Muse Spark Open post (816B total, 42B active, 1M context) is far more specific about availability than capability: seven API hosts, four weight hubs and seven-plus engines on day one, none of them Meta. The local recipe is two 512GB M5 Ultra Mac Studios running through MLX. Meta is giving the weights away to buy presence across every stack, which fits the Spyglass reading that its open tier trails its closed one.