claude-sonnet-5.5-high vs deepseek-v4.1-flash-max Benchmark Comparison

Direct benchmark comparison between claude-sonnet-5.5-high and deepseek-v4.1-flash-max based on LMArena Elo and the latest 2026 API pricing.

Direct Technical & Pricing Comparison

Frontier Model	LMArena Elo	API Cost (1M)	Throughput
claude-sonnet-5.5-high	1699	$0.000002	102
deepseek-v4.1-flash-max	1477	$3e-7	71

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

Comparison Summary: claude-sonnet-5.5-high is the more capable model in this pair, leading by 222 Elo points. Specifically, deepseek-v4.1-flash-max is currently on the Pareto line, suggesting it offers better systemic value for its performance tier.