Performance Benchmarks for gpt-5.5

Analyze how gpt-5.5 stacks up against other frontier models in terms of cost-to-performance and raw intelligence (LMArena Elo).

2026 Performance Summary

🚀 Intelligence (Elo): 1476
💰 API Cost (Input): $0.00000125 / 1M tokens
⚡ API Cost (Output): $0.00001 / 1M tokens
⏱️ Real-world Throughput: 64 tokens/s

Analysis: gpt-5.5 offers competitive performance with an Elo of 1476. For developers optimizing strictly for cost-to-performance, we recommend comparing it against the current frontier leaders.

Highly Recommended Alternatives

Frontier Model	LMArena Elo	API Cost (1M)	Throughput
gemini-3-flash	1473	$5e-7	66
mimo-v2.5-pro	1465	$4.35e-7	74
gemini-3.5-flash-lite	1460	$3e-7	55
hy3	1457	$1.32e-7	51
qwen3-235b-a22b-instruct-2507	1423	$9e-8	56

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