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OpenAI: GPT-5.5 vs StepFun: Step 3.7 Flash

Summary

GPT-5.5 vs Step 3.7 Flash benchmark comparison: GPT-5.5 leads on average score with 9.0 vs 7.1. Step 3.7 Flash has the lower benchmark cost at $1.148 vs $3.679. GPT-5.5 is faster at 37.98s vs 64.46s, with pass rates of 87.3% vs 63.5%.

Recommended model: GPT-5.5 - It has the best score here (9.0), while responding about 1.7x faster than Step 3.7 Flash.

Last updated at: 2026-06-18

Metric GPT-5.5 GPT-5.5 medium Release: 2026-04-24 Step 3.7 Flash Step 3.7 Flash high Release: 2026-05-29
Score 9.0 7.1
Rank #9 #63
Reliability 10.0 10.0
Consistency 8.9 8.2
Tests Correct
Attempt pass rate 87.3% 63.5%
Flaky tests 3 4
Total Runs 63 63
Cost per result 21.638 10.434
Total Cost $3.679 $1.148
Input Price $5.000 / 1M $0.200 / 1M
Output Price $30.000 / 1M $1.150 / 1M
Total Input Tokens 34,212 38,391
Output Tokens 1,985 991,355
Reasoning Tokens 114,925 0
Response Time (avg) 37.98s 64.46s
Response Time (max) 332.10s 364.99s
Response Time (total) 797.60s 1353.57s

Generation showcase

Hamster playing table tennis

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

#9 GPT-5.5

medium
Cost
$0.112
Time
71.9s
Tokens
3,807 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-5.5 10.0 10.0 100.0% 0 4.66s 606 250 1,335
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-5.5 8.8 7.8 88.9% 1 59.77s 7,305 362 24,959
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-5.5 10.0 10.0 100.0% 0 19.29s 11,019 312 2,841
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-5.5 10.0 10.0 100.0% 0 4.18s 7,140 234 593
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-5.5 5.3 7.2 44.4% 1 164.14s 723 67 79,625
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-5.5 10.0 10.0 100.0% 0 4.16s 477 138 223
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-5.5 10.0 10.0 100.0% 0 3.36s 660 93 538
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-5.5 10.0 10.0 100.0% 0 6.76s 642 241 2,225
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-5.5 10.0 10.0 100.0% 0 10.57s 5,445 258 832
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-5.5 2.8 1.6 33.3% 1 37.86s 195 30 1,754
Step 3.7 Flash 3.0 10.0 0.0% 0 149.34s 222 147,476 0

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