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OpenAI: GPT-5 Mini vs StepFun: Step 3.5 Flash

Last updated at: 2026-06-01

Metric GPT-5 Mini GPT-5 Mini medium Release: 2025-08-07 Step 3.5 Flash Step 3.5 Flash medium Release: 2026-02-01
Score 7.2 7.4
Rank #73 #61
Reliability 10.0 10.0
Consistency 9.1 9.1
Tests Correct
Attempt pass rate 61.7% 61.4%
Flaky tests 2 2
Total Runs 60 57
Cost per result 1.348 0.133
Total Cost $0.149 $0.062
Input Price $0.250 / 1M $0.090 / 1M
Output Price $2.000 / 1M $0.300 / 1M
Output Tokens 6,723 90,478
Reasoning Tokens 63,082 173,544
Response Time (avg) 23.75s 43.20s
Response Time (max) 88.15s 170.45s
Response Time (total) 475.03s 561.54s

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 Mini 7.1 7.6 66.7% 1 13.86s 1,715 6,378
Step 3.5 Flash 10.0 10.0 100.0% 0 40.57s 20,391 24,176
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5 Mini 10.0 10.0 100.0% 0 30.74s 580 12,544
Step 3.5 Flash 2.5 6.0 33.3% 1 62.83s 12,098 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5 Mini 10.0 10.0 100.0% 0 88.15s 754 11,520
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 Mini 10.0 10.0 100.0% 0 12.58s 453 3,200
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 Mini 3.6 7.2 22.2% 1 44.63s 293 14,016
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 Mini 4.5 10.0 0.0% 0 13.50s 349 1,856
Step 3.5 Flash 5.5 10.0 0.0% 0 22.39s 240 3,506
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5 Mini 10.0 10.0 100.0% 0 11.59s 310 3,968
Step 3.5 Flash 8.3 10.0 50.0% 0 4.78s 2,364 3,521
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5 Mini 5.6 9.8 33.3% 0 15.20s 1,622 6,144
Step 3.5 Flash 5.3 10.0 33.3% 0 7.22s 5,630 10,861
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5 Mini 10.0 10.0 100.0% 0 18.64s 487 1,600
Step 3.5 Flash 10.0 10.0 100.0% 0 11.91s 275 3,802
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
GPT-5 Mini 3.0 10.0 0.0% 0 9.99s 160 1,856
Step 3.5 Flash 3.0 10.0 0.0% 0 108.45s 2,354 10,372

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