Muse Spark 1.3 with max reasoning, in limited preview for partners, scores 62 on the Artificial Analysis Intelligence Index, behind only Fable 5.1 and Opus 5 (@artificialanlys)

Meta released Muse Spark 1.3, the fourth Muse Spark model in five months, offering a max-reasoning variant. The model is in limited preview for Meta partners and scores 62 on the Artificial Analysis Intelligence Index, ranking just below Claude Fable 5.1 and Claude Opus 5.