kimi-k2.5-thinking vs grok-4-fast-chat

Direct benchmark comparison between kimi-k2.5-thinking 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-k2.5-thinking	1453	$3.827e-7	29
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, kimi-k2.5-thinking currently leads with an Elo of 1453.