gpt-5.5 vs gpt-5.1 Benchmark Comparison
Direct benchmark comparison between gpt-5.5 and gpt-5.1 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 |
1477 |
$0.00000125 |
31 |
| gpt-5.1 |
1439 |
$0.00000125 |
89 |
*These models represent the Pareto Frontier (optimal cost-to-performance).*
Comparison Summary: gpt-5.5 is the more capable model in this pair, leading by 38 Elo points. Specifically, gpt-5.5 is currently on the Pareto line, suggesting it offers better systemic value for its performance tier.