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OpenAI: GPT-5.4 Nano vs StepFun: Step 3.5 Flash

Last updated at: 2026-03-17

Metric GPT-5.4 Nano GPT-5.4 Nano none Release: 2026-03-17 Step 3.5 Flash Step 3.5 Flash medium Release: 2026-02-01 Free Available
Rank #73 #22
Score 4.3 7.9
Consistency 7.3 9.1
Cost per result 0.404 0.000
Total Cost $0.009 $0.000
Tests Correct
Attempt pass rate 29.4% 70.6%
Flaky tests 6 2
Total Runs 51 49
Output Tokens 2,185 71,904
Reasoning Tokens 0 155,607
Response Time (avg) 1.39s 26.78s
Response Time (max) 3.84s 170.45s
Response Time (total) 23.70s 294.58s

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Category Breakdown

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.4 Nano 3.5 8.0 16.7% 1 1.18s 800 0
Step 3.5 Flash 10.0 10.0 100.0% 0 13.56s 14,376 17,668
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.4 Nano 3.0 10.0 0.0% 0 3.84s 280 0
Step 3.5 Flash 10.0 10.0 100.0% 0 29.57s 1,176 12,984
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.4 Nano 6.5 10.0 50.0% 0 1.11s 219 0
Step 3.5 Flash 10.0 10.0 100.0% 0 15.01s 600 13,886
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.4 Nano 2.9 4.4 22.2% 2 926ms 52 0
Step 3.5 Flash 5.3 7.2 44.4% 1 170.45s 45,350 90,436
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.4 Nano 3.8 2.5 33.3% 1 1.31s 180 0
Step 3.5 Flash 5.5 10.0 0.0% 0 6.54s 2,214 2,584
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.4 Nano 5.0 6.8 33.3% 1 787ms 84 0
Step 3.5 Flash 8.5 6.8 83.3% 1 4.98s 2,284 3,412
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.4 Nano 3.7 7.3 22.2% 1 1.29s 348 0
Step 3.5 Flash 5.3 10.0 33.3% 0 7.72s 5,629 10,835
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5.4 Nano 10.0 10.0 100.0% 0 3.40s 222 0
Step 3.5 Flash 10.0 10.0 100.0% 0 11.91s 275 3,802

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