DeepSeek V4 Pro vs GPT-5.5
The comparison
On LM Arena, GPT-5.5 scores higher (1481 Elo vs 1458 Elo), from a larger review base (28,268 vs 26,928 Arena votes).
As of Jun 24, 2026, DeepSeek V4 Pro is rated 1458 Elo on LM Arena (26,928 Arena votes); GPT-5.5 is rated 1481 Elo on LM Arena (28,268 Arena votes). No source is blended; each stands on its own.
DeepSeek V4 Pro
1458 EloLM Arena
26,928Arena votes
GPT-5.5
1481 EloLM Arenahigher
28,268Arena voteslarger base