claude-opus-4-1-20250805 vs gpt-5.5 Benchmark Comparison

Direct benchmark comparison between claude-opus-4-1-20250805 and gpt-5.5 based on LMArena Elo and the latest 2026 API pricing.

Direct Technical & Pricing Comparison

Frontier Model	LMArena Elo	API Cost (1M)	Throughput
claude-opus-4-1-20250805	1447	$0.000015	18
gpt-5.5	1476	$0.00000125	94

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

Comparison Summary: These models are highly competitive, with a negligible Elo gap of only 29 points. The choice between them should be driven by specific API features or provider preference. However, neither model is currently Pareto-optimal. Developers looking for peak efficiency should investigate claude-opus-4-6-thinking, which offers a superior benchmark-to-price ratio.