Over a 72‑hour period, four major open‑weight model drops were announced, including Meta’s Muse Spark Open with 816B total parameters, 42B active, and a 1M‑token context window. Running Muse Spark Open requires dual‑512GB M5 Ultra Mac Studios (or four 256GB units, roughly $38k) due to its massive memory footprint. Among the releases, only NVIDIA’s model can be accommodated within a 24 GB GPU memory limit.