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

Summary

GPT-5.6 Luna (medium) vs Step 3.7 Flash (low) benchmark comparison: Step 3.7 Flash (low) leads on average score with 7.7 vs 7.6. GPT-5.6 Luna (medium) has the lower benchmark cost at $0.258 vs $0.341. GPT-5.6 Luna (medium) is faster at 6.70s vs 15.74s, with pass rates of 63.5% vs 68.3%.

Recommended model: GPT-5.6 Luna (medium) - Its score stays close to the best score here (7.6 vs 7.7), while responding about 2.4x faster than Step 3.7 Flash (low).

Last updated at: 2026-07-09

Metric GPT-5.6 Luna GPT-5.6 Luna medium Release: 2026-07-09 Step 3.7 Flash Step 3.7 Flash low Release: 2026-05-29
Score 7.6 7.7
Rank #54 #49
Reliability 10.0 10.0
Consistency 9.6 8.4
Tests Correct
Attempt pass rate 63.5% 68.3%
Flaky tests 1 4
Total Runs 63 63
Cost per result 1.978 2.840
Total Cost $0.258 $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 2,148 289,325
Reasoning Tokens 34,740 0
Response Time (avg) 6.70s 15.74s
Response Time (max) 29.85s 124.75s
Response Time (total) 140.62s 330.63s

Generation showcase

Hamster playing table tennis

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

#54 GPT-5.6 Luna

medium
Cost
$0.014
Time
14.6s
Tokens
2,362 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 2.52s 606 160 987
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 5.4 7.2 44.4% 1 10.38s 7,302 564 9,928
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 9.53s 12,500 375 1,354
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 1.95s 7,140 234 324
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 5.3 10.0 33.3% 0 17.37s 723 68 16,531
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 5.1 10.0 0.0% 0 4.34s 477 112 496
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 2.38s 660 95 393
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 7.8 10.0 66.7% 0 4.04s 642 255 2,104
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 6.02s 5,454 256 244
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 6.64s 195 29 2,379
Step 3.7 Flash 3.0 10.0 0.0% 0 124.75s 237 134,779 0

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