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OpenAI: GPT-5.6 Luna vs StepFun: Step 3.7 Flash

Summary

GPT-5.6 Luna (high) vs Step 3.7 Flash (low) benchmark comparison: The average score is effectively tied at 7.7 vs 7.7. Step 3.7 Flash (low) has the lower benchmark cost at $0.341 vs $0.924. Step 3.7 Flash (low) is faster at 15.74s vs 18.39s, with pass rates of 71.4% vs 68.3%.

Recommended model: Step 3.7 Flash (low) - It has the best score here (7.7), while costing about 2.7x less than GPT-5.6 Luna (high).

Last updated at: 2026-07-09

Metric GPT-5.6 Luna GPT-5.6 Luna high Release: 2026-07-09 Step 3.7 Flash Step 3.7 Flash low Release: 2026-05-29
Score 7.7 7.7
Rank #50 #49
Reliability 10.0 10.0
Consistency 8.8 8.4
Tests Correct
Attempt pass rate 71.4% 68.3%
Flaky tests 3 4
Total Runs 63 63
Cost per result 6.594 2.840
Total Cost $0.924 $0.341
Input Price $1.000 / 1M $0.200 / 1M
Output Price $6.000 / 1M $1.150 / 1M
Total Input Tokens 35,699 40,101
Output Tokens 2,079 289,325
Reasoning Tokens 145,816 0
Response Time (avg) 18.39s 15.74s
Response Time (max) 111.09s 124.75s
Response Time (total) 386.24s 330.63s

Generation showcase

Hamster playing table tennis

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

#50 GPT-5.6 Luna

high
Cost
$0.033
Time
34.2s
Tokens
5,484 tok

#49 Step 3.7 Flash

low
Invalid SVG
Cost
$0.004
Time
25.3s
Tokens
3,072 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 Luna 8.3 10.0 75.0% 0 2.99s 606 162 1,265
Step 3.7 Flash 8.7 7.9 91.7% 1 4.02s 756 10,896 0
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 5.5 4.7 55.6% 2 15.63s 7,302 510 17,746
Step 3.7 Flash 8.2 7.2 88.9% 1 9.46s 7,437 18,685 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 10.0 10.0 100.0% 0 13.29s 12,500 357 2,911
Step 3.7 Flash 10.0 10.0 100.0% 0 7.98s 13,683 6,426 0
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 10.0 10.0 100.0% 0 2.18s 7,140 234 470
Step 3.7 Flash 7.3 5.8 83.3% 1 2.29s 7,398 2,667 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 7.7 10.0 66.7% 0 78.96s 723 69 96,395
Step 3.7 Flash 5.3 7.2 44.4% 1 43.31s 828 104,487 0
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 5.0 10.0 0.0% 0 3.65s 477 117 563
Step 3.7 Flash 3.4 9.3 0.0% 0 7.00s 525 4,604 0
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 9.9 10.0 100.0% 0 1.79s 660 97 481
Step 3.7 Flash 9.8 10.0 100.0% 0 1.58s 735 1,857 0
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 7.6 7.2 77.8% 1 14.55s 642 242 18,281
Step 3.7 Flash 5.5 9.9 33.3% 0 1.84s 756 3,564 0
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 10.0 10.0 100.0% 0 4.98s 5,454 260 324
Step 3.7 Flash 10.0 10.0 100.0% 0 3.25s 7,746 1,360 0
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 3.0 10.0 0.0% 0 17.00s 195 31 7,380
Step 3.7 Flash 3.0 10.0 0.0% 0 124.75s 237 134,779 0

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