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OpenAI: GPT-5.5 vs OpenAI: GPT-5 Nano

Last updated at: 2026-05-19

Metric GPT-5.5 GPT-5.5 none Release: 2026-04-24 GPT-5 Nano GPT-5 Nano medium Release: 2025-08-07
Score 6.7 6.2
Rank #79 #90
Reliability 10.0 10.0
Consistency 8.7 7.0
Tests Correct
Attempt pass rate 59.7% 57.9%
Flaky tests 3 7
Total Runs 57 57
Cost per result 1.961 0.856
Total Cost $0.197 $0.069
Input Price $5.000 / 1M $0.050 / 1M
Output Price $30.000 / 1M $0.400 / 1M
Output Tokens 1,928 5,214
Reasoning Tokens 0 162,432
Response Time (avg) 1.99s 42.13s
Response Time (max) 5.56s 204.02s
Response Time (total) 37.87s 505.59s

Top Models by Score

Score vs Total Cost

Response Time (avg)

Score vs Response Time (avg)

Total Output Tokens

Score vs Total Output Tokens

Category Breakdown

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.5 6.9 7.9 66.7% 1 1.31s 213 0
GPT-5 Nano 6.5 7.9 58.3% 1 25.50s 1,221 21,184
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.5 10.0 10.0 100.0% 0 2.05s 426 0
GPT-5 Nano 6.7 3.5 66.7% 1 40.73s 480 12,992
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.5 3.0 10.0 0.0% 0 5.56s 300 0
GPT-5 Nano 10.0 10.0 100.0% 0 65.96s 578 17,984
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.5 10.0 10.0 100.0% 0 1.18s 222 0
GPT-5 Nano 3.7 1.7 50.0% 2 21.42s 453 10,560
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.5 2.9 7.2 11.1% 1 1.31s 52 0
GPT-5 Nano 5.2 4.4 55.6% 2 204.02s 237 64,448
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.5 10.0 10.0 100.0% 0 3.41s 124 0
GPT-5 Nano 4.1 10.0 0.0% 0 17.51s 202 4,608
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.5 6.2 5.8 66.7% 1 1.15s 81 0
GPT-5 Nano 9.8 10.0 100.0% 0 11.90s 382 4,096
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.5 7.7 10.0 66.7% 0 1.36s 245 0
GPT-5 Nano 5.3 7.2 44.4% 1 19.81s 869 13,440
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.5 10.0 10.0 100.0% 0 3.90s 247 0
GPT-5 Nano 10.0 10.0 100.0% 0 33.30s 558 6,976
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.5 3.0 10.0 0.0% 0 5.01s 18 0
GPT-5 Nano 3.0 10.0 0.0% 0 20.13s 234 6,144

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