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OpenAI: GPT-5.6 Sol vs StepFun: Step 3.5 Flash

Summary

GPT-5.6 Sol vs Step 3.5 Flash (medium) benchmark comparison: Step 3.5 Flash (medium) leads on average score with 6.6 vs 6.3. Step 3.5 Flash (medium) has the lower benchmark cost at $0.070 vs $0.225. GPT-5.6 Sol is faster at 1.66s vs 72.53s, with pass rates of 57.1% vs 54.0%.

Recommended model: Step 3.5 Flash (medium) - It has the best score here (6.6), while costing about 3.2x less than GPT-5.6 Sol.

Last updated at: 2026-07-09

Metric GPT-5.6 Sol GPT-5.6 Sol none Release: 2026-07-09 Step 3.5 Flash Step 3.5 Flash medium Release: 2026-02-01
Score 6.3 6.6
Rank #101 #93
Reliability 10.0 10.0
Consistency 9.0 8.9
Tests Correct
Attempt pass rate 57.1% 54.0%
Flaky tests 3 1
Total Runs 63 60
Cost per result 2.244 0.198
Total Cost $0.225 $0.070
Input Price $5.000 / 1M $0.100 / 1M
Output Price $30.000 / 1M $0.300 / 1M
Total Input Tokens 34,218 34,431
Output Tokens 1,776 91,587
Reasoning Tokens 0 195,973
Response Time (avg) 1.66s 72.53s
Response Time (max) 3.93s 453.94s
Response Time (total) 34.81s 1015.47s

Generation showcase

Hamster playing table tennis

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

#101 GPT-5.6 Sol

none
Cost
$0.116
Time
78.7s
Tokens
3,944 tok

#93 Step 3.5 Flash

medium
Cost
$0.008
Time
277.1s
Tokens
23,695 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-5.6 Sol 8.3 10.0 75.0% 0 1.27s 606 154 0
Step 3.5 Flash 10.0 10.0 100.0% 0 40.57s 694 20,391 24,176
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Sol 5.5 10.0 33.3% 0 1.39s 7,302 390 0
Step 3.5 Flash 2.4 5.2 0.0% 0 258.38s 2,211 13,207 22,429
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Sol 3.0 10.0 0.0% 0 3.93s 11,019 300 0
Step 3.5 Flash 10.0 10.0 100.0% 0 29.57s 13,638 1,176 12,984
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Sol 10.0 10.0 100.0% 0 1.53s 7,140 222 0
Step 3.5 Flash 10.0 10.0 100.0% 0 15.01s 7,368 600 13,886
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Sol 3.6 7.2 22.2% 1 1.43s 723 54 0
Step 3.5 Flash 5.3 7.2 44.4% 1 170.45s 673 45,350 90,436
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Sol 6.5 3.4 66.7% 1 1.52s 477 91 0
Step 3.5 Flash 5.5 10.0 0.0% 0 22.39s 509 240 3,506
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Sol 8.5 6.8 83.3% 1 1.33s 660 84 0
Step 3.5 Flash 8.3 10.0 50.0% 0 4.78s 705 2,364 3,521
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Sol 7.7 10.0 66.7% 0 1.49s 642 211 0
Step 3.5 Flash 5.3 10.0 33.3% 0 7.22s 711 5,630 10,861
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Sol 10.0 10.0 100.0% 0 3.70s 5,454 246 0
Step 3.5 Flash 10.0 10.0 100.0% 0 11.91s 7,701 275 3,802
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Sol 3.0 10.0 0.0% 0 1.95s 195 24 0
Step 3.5 Flash 3.0 10.0 0.0% 0 108.45s 221 2,354 10,372

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