gemini-2.5-pro vs grok-4-fast-chat

Direct benchmark comparison between gemini-2.5-pro and grok-4-fast-chat based on LMArena Elo and latest API pricing.

Direct Technical Comparison

Frontier Model	LMArena Elo	API Cost (1M)	Throughput
gemini-2.5-pro	1448	$0.00000125	88
grok-4-fast-chat	1421	$2e-7	164

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

Conclusion: For developers looking for higher intelligence, gemini-2.5-pro currently leads with an Elo of 1448.