gpt-5.3-chat-latest vs grok-4.5 Benchmark Comparison

Direct benchmark comparison between gpt-5.3-chat-latest and grok-4.5 based on LMArena Elo and the latest 2026 API pricing.

Direct Technical & Pricing Comparison

Frontier Model	LMArena Elo	API Cost (1M)	Throughput
gpt-5.3-chat-latest	1449	$0.00000175	61
grok-4.5	1572	$0.000002	83

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

Comparison Summary: grok-4.5 is the more capable model in this pair, leading by 123 Elo points.