gemini-2.5-pro vs gemini-3.5-flash-lite Benchmark Comparison

Direct benchmark comparison between gemini-2.5-pro and gemini-3.5-flash-lite based on LMArena Elo and the latest 2026 API pricing.

Direct Technical & Pricing Comparison

Frontier Model	LMArena Elo	API Cost (1M)	Throughput
gemini-2.5-pro	1445	$0.00000125	103
gemini-3.5-flash-lite	1458	$3e-7	88

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

Comparison Summary: These models are highly competitive, with a negligible Elo gap of only 13 points. The choice between them should be driven by specific API features or provider preference. Specifically, gemini-3.5-flash-lite is currently on the Pareto line, suggesting it offers better systemic value for its performance tier.