GPT-5.5 vs Muse Spark 1.2
The comparison
On LM Arena, Muse Spark 1.2 scores higher (1498 Elo vs 1481 Elo), from a smaller review base (3,275 vs 55,130 Arena votes).
As of Aug 12, 2026, GPT-5.5 is rated 1481 Elo on LM Arena (55,130 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.
GPT-5.5
1481 EloLM Arena
55,130Arena voteslarger base
Muse Spark 1.2
1498 EloLM Arenahigher
3,275Arena votes