claude-sonnet-4-5-20250929 vs kimi-k3 Benchmark Comparison

Direct benchmark comparison between claude-sonnet-4-5-20250929 and kimi-k3 based on LMArena Elo and the latest 2026 API pricing.

Direct Technical & Pricing Comparison

Frontier Model	LMArena Elo	API Cost (1M)	Throughput
claude-sonnet-4-5-20250929	1455	$0.000003	40
kimi-k3	1486	$0.000003	23

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

Comparison Summary: kimi-k3 is the more capable model in this pair, leading by 31 Elo points.