Gemini 3.1 Pro vs GPT-5.5
The comparison
On LM Arena, Gemini 3.1 Pro scores higher (1486 Elo vs 1481 Elo), from a larger review base (94,728 vs 55,130 Arena votes).
As of Aug 12, 2026, Gemini 3.1 Pro is rated 1486 Elo on LM Arena (94,728 Arena votes); GPT-5.5 is rated 1481 Elo on LM Arena (55,130 Arena votes). No source is blended; each stands on its own.
Gemini 3.1 Pro
1486 EloLM Arenahigher
94,728Arena voteslarger base
GPT-5.5
1481 EloLM Arena
55,130Arena votes