kimi-k2-0905-preview vs grok-4-fast-chat

Direct benchmark comparison between kimi-k2-0905-preview and grok-4-fast-chat 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-fast-chat	1421	$2e-7	164

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

Conclusion: For developers looking for higher intelligence, grok-4-fast-chat currently leads with an Elo of 1421.