Claude Opus 5 vs Muse Spark 1.2

On LM Arena, Claude Opus 5 has 1494 Elo and Muse Spark 1.2 has 1498 Elo. Muse Spark 1.2 has the higher displayed score on this source. Each source stands on its own; these scores do not establish an overall winner.

Claude Opus 5: 1494 Elo on LM Arena (19,353 Arena votes) (snapshot Aug 12, 2026). Muse Spark 1.2: 1498 Elo on LM Arena (3,275 Arena votes) (snapshot Aug 12, 2026). The snapshots may have been collected on different dates.