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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 medium Release: 2026-03-17 Step 3.5 Flash Step 3.5 Flash medium Release: 2026-02-01 Free Available
Rank #28 #22
Score 7.4 7.9
Consistency 9.0 9.1
Cost per result 0.769 0.000
Total Cost $0.077 $0.000
Tests Correct
Attempt pass rate 66.7% 70.6%
Flaky tests 2 2
Total Runs 51 49
Output Tokens 2,474 71,904
Reasoning Tokens 54,516 155,607
Response Time (avg) 11.08s 26.78s
Response Time (max) 94.06s 170.45s
Response Time (total) 188.39s 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 8.3 10.0 75.0% 0 4.52s 683 2,254
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 9.8 10.0 100.0% 0 24.13s 349 5,719
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 10.0 10.0 100.0% 0 2.54s 234 516
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 5.9 7.2 55.6% 1 38.18s 60 43,325
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 4.5 10.0 0.0% 0 4.15s 179 443
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 9.8 10.0 100.0% 0 1.88s 95 521
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 4.0 7.1 22.2% 1 3.65s 640 1,356
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 7.71s 234 382
Step 3.5 Flash 10.0 10.0 100.0% 0 11.91s 275 3,802

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