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OpenAI: GPT-5 Nano vs StepFun: Step 3.7 Flash

Summary

GPT-5 Nano vs Step 3.7 Flash benchmark comparison: Step 3.7 Flash leads on average score with 7.1 vs 6.7. GPT-5 Nano has the lower benchmark cost at $0.081 vs $1.148. GPT-5 Nano is faster at 42.51s vs 64.46s, with pass rates of 57.1% vs 63.5%.

Recommended model: GPT-5 Nano - Its score stays close to the best score here (6.7 vs 7.1), while costing about 14.2x less than Step 3.7 Flash.

Last updated at: 2026-06-18

Metric GPT-5 Nano GPT-5 Nano medium Release: 2025-08-07 Step 3.7 Flash Step 3.7 Flash high Release: 2026-05-29
Score 6.7 7.1
Rank #79 #63
Reliability 10.0 10.0
Consistency 7.3 8.2
Tests Correct
Attempt pass rate 57.1% 63.5%
Flaky tests 7 4
Total Runs 63 63
Cost per result 0.897 10.434
Total Cost $0.081 $1.148
Input Price $0.050 / 1M $0.200 / 1M
Output Price $0.400 / 1M $1.150 / 1M
Total Input Tokens 34,108 38,391
Output Tokens 5,464 991,355
Reasoning Tokens 192,064 0
Response Time (avg) 42.51s 64.46s
Response Time (max) 204.02s 364.99s
Response Time (total) 595.09s 1353.57s

Generation showcase

Hamster playing table tennis

Prompt: Create a detailed SVG illustration of a hamster playing table tennis.

#79 GPT-5 Nano

medium
Cost
$0.006
Time
108.5s
Tokens
13,209 tok

#63 Step 3.7 Flash

high
Cost
$0.007
Time
63.6s
Tokens
6,030 tok

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) Input Tokens Output Tokens Reasoning Tokens
GPT-5 Nano 6.5 7.9 58.3% 1 25.50s 606 1,221 21,184
Step 3.7 Flash 10.0 10.0 100.0% 0 13.40s 696 42,656 0
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5 Nano 7.0 7.7 55.6% 1 41.62s 7,305 740 41,152
Step 3.7 Flash 4.0 6.0 22.2% 1 206.21s 6,057 327,340 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5 Nano 10.0 10.0 100.0% 0 65.96s 11,019 578 17,984
Step 3.7 Flash 10.0 10.0 100.0% 0 13.01s 13,638 8,802 0
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5 Nano 3.7 1.7 50.0% 2 21.42s 7,140 453 10,560
Step 3.7 Flash 10.0 10.0 100.0% 0 14.72s 7,368 23,113 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5 Nano 5.2 4.4 55.6% 2 204.02s 619 237 64,448
Step 3.7 Flash 4.1 4.4 44.5% 2 149.64s 783 410,502 0
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5 Nano 4.1 10.0 0.0% 0 17.51s 477 202 4,608
Step 3.7 Flash 5.5 10.0 0.0% 0 4.17s 510 2,862 0
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5 Nano 9.8 10.0 100.0% 0 15.64s 660 312 4,736
Step 3.7 Flash 9.8 10.0 100.0% 0 1.52s 705 2,010 0
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5 Nano 5.3 7.2 44.4% 1 20.63s 642 929 14,272
Step 3.7 Flash 5.3 7.2 44.4% 1 10.22s 711 25,422 0
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5 Nano 10.0 10.0 100.0% 0 33.30s 5,445 558 6,976
Step 3.7 Flash 10.0 10.0 100.0% 0 2.79s 7,701 1,172 0
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5 Nano 3.0 10.0 0.0% 0 20.13s 195 234 6,144
Step 3.7 Flash 3.0 10.0 0.0% 0 149.34s 222 147,476 0

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