grok-4.20-beta-0309-reasoning vs glm-5 Benchmark Comparison

Direct benchmark comparison between grok-4.20-beta-0309-reasoning and glm-5 based on LMArena Elo and the latest 2026 API pricing.

Direct Technical & Pricing Comparison

Frontier Model	LMArena Elo	API Cost (1M)	Throughput
grok-4.20-beta-0309-reasoning	1480	$0.000002	132
glm-5	1456	$7.2e-7	20

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

Comparison Summary: These models are highly competitive, with a negligible Elo gap of only 24 points. The choice between them should be driven by specific API features or provider preference.