gpt-5.1 vs grok-4-fast-chat

Direct benchmark comparison between gpt-5.1 and grok-4-fast-chat based on LMArena Elo and latest API pricing.

Direct Technical Comparison

Frontier Model	LMArena Elo	API Cost (1M)	Throughput
gpt-5.1	1439	$0.00000125	52
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, gpt-5.1 currently leads with an Elo of 1439.