gpt-5.5-high vs grok-4.5 Benchmark Comparison
Direct benchmark comparison between gpt-5.5-high 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-5.5-high |
1482 |
$0.000005 |
85.5 |
| grok-4.5 |
1468 |
$0.000002 |
54 |
*These models represent the Pareto Frontier (optimal cost-to-performance).*
Comparison Summary: These models are highly competitive, with a negligible Elo gap of only 14 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 hy4-preview, which offers a superior benchmark-to-price ratio.