Arena says Meta’s Muse Spark 1.3 (Max) ranks No. 13

Arena reported on September 11 that Muse Spark 1.3 (Max) ranked No. 13 in Agent Arena, compared with No. 30 for Muse Spark 1.2 (xHigh). It reported +4.2% net improvement across 8.7K-plus real-world AI-agent sessions—a six-percentage-point lift from −1.8%.

Meta announced Muse Spark 1.3 on September 2, saying it improved coding performance and could sustain longer work across multiple workflows in one thread. Meta also says the model collaborates more actively by asking clarifying questions, flagging when it is stuck and confirming before consequential actions.