Claude Opus 5 vs Gemini 3.6 Flash
The comparison
On LM Arena, Claude Opus 5 scores higher (1494 Elo vs 1483 Elo), from a larger review base (19,353 vs 13,481 Arena votes).
As of Aug 12, 2026, Claude Opus 5 is rated 1494 Elo on LM Arena (19,353 Arena votes); Gemini 3.6 Flash is rated 1483 Elo on LM Arena (13,481 Arena votes). No source is blended; each stands on its own.
Claude Opus 5
1494 EloLM Arenahigher
19,353Arena voteslarger base
Gemini 3.6 Flash
1483 EloLM Arena
13,481Arena votes