Claude Opus 5 vs Muse Spark 1.2
The comparison
On LM Arena, Muse Spark 1.2 scores higher (1498 Elo vs 1494 Elo), from a smaller review base (3,275 vs 19,353 Arena votes).
As of Aug 12, 2026, Claude Opus 5 is rated 1494 Elo on LM Arena (19,353 Arena votes); Muse Spark 1.2 is rated 1498 Elo on LM Arena (3,275 Arena votes). No source is blended; each stands on its own.
Claude Opus 5
1494 EloLM Arena
19,353Arena voteslarger base
Muse Spark 1.2
1498 EloLM Arenahigher
3,275Arena votes