Muse Spark Open is the best US open-weight model by 12 points and leads all open models on knowledge reliability. It also costs the same per token as the closed Muse Spark 1.3, scores 8% on Terminal-Bench 4.0 and ships under a license you need to read.
Muse Spark Open: America’s Strongest Open-Weight Model, Priced Like Meta’s Closed One
