kimi-k2.5-thinking vs hy4-preview Benchmark Comparison

Direct benchmark comparison between kimi-k2.5-thinking and hy4-preview based on LMArena Elo and the latest 2026 API pricing.

Direct Technical & Pricing Comparison

Frontier Model	LMArena Elo	API Cost (1M)	Throughput
kimi-k2.5-thinking	1450	$4.5e-7	67
hy4-preview	1631	$8.34e-7	30

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

Comparison Summary: hy4-preview is the more capable model in this pair, leading by 181 Elo points. Specifically, hy4-preview is currently on the Pareto line, suggesting it offers better systemic value for its performance tier.