gemini-3.1-pro-preview vs grok-4-1-fast-reasoning Benchmark Comparison

Direct benchmark comparison between gemini-3.1-pro-preview and grok-4-1-fast-reasoning 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	1492	$0.000002	46
grok-4-1-fast-reasoning	1432	$2e-7	109

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

Comparison Summary: gemini-3.1-pro-preview is the more capable model in this pair, leading by 60 Elo points.