gemini-3.1-pro-preview vs gpt-5.5 Benchmark Comparison

Direct benchmark comparison between gemini-3.1-pro-preview and gpt-5.5 based on LMArena Elo and the latest 2026 API pricing.

Direct Technical & Pricing Comparison

Frontier Model	LMArena Elo	API Cost (1M)	Throughput
gemini-3.1-pro-preview	1493	$0.000002	60
gpt-5.5	1475	$0.00000125	42

*These models represent the Pareto Frontier (optimal cost-to-performance).*

Comparison Summary: These models are highly competitive, with a negligible Elo gap of only 18 points. The choice between them should be driven by specific API features or provider preference. Notably, both models are on the Pareto Frontier, representing a true trade-off between higher intelligence and lower cost.