kimi-k2-0905-preview vs grok-4-1-fast-reasoning

Direct benchmark comparison between kimi-k2-0905-preview and grok-4-1-fast-reasoning based on LMArena Elo and latest API pricing.

Direct Technical Comparison

Frontier Model	LMArena Elo	API Cost (1M)	Throughput
kimi-k2-0905-preview	1418	$4e-7	23
grok-4-1-fast-reasoning	1431	$2e-7	95

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

Conclusion: For developers looking for higher intelligence, grok-4-1-fast-reasoning currently leads with an Elo of 1431.