gemini-3.5-flash vs gpt-5.1 Benchmark Comparison
Direct benchmark comparison between gemini-3.5-flash 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 |
| gemini-3.5-flash |
1480 |
$0.0000015 |
118 |
| gpt-5.1 |
1439 |
$0.00000125 |
73 |
*These models represent the Pareto Frontier (optimal cost-to-performance).*
Comparison Summary: gemini-3.5-flash is the more capable model in this pair, leading by 41 Elo points. Specifically, gemini-3.5-flash is currently on the Pareto line, suggesting it offers better systemic value for its performance tier.