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Google: Gemma 4 31B vs OpenAI: GPT-5.6 Luna

Summary

Gemma 4 31B (medium) vs GPT-5.6 Luna (low) benchmark comparison: Gemma 4 31B (medium) leads on average score with 6.3 vs 6.2. Gemma 4 31B (medium) has the lower benchmark cost at $0.033 vs $0.141. GPT-5.6 Luna (low) is faster at 4.35s vs 56.55s, with pass rates of 69.8% vs 57.1%.

Recommended model: Gemma 4 31B (medium) - It has the best score here (6.3), while costing about 4.3x less than GPT-5.6 Luna (low).

Last updated at: 2026-07-09

Metric Gemma 4 31B Gemma 4 31B medium Release: 2026-04-02 Free Available GPT-5.6 Luna GPT-5.6 Luna low Release: 2026-07-09
Score 6.3 6.2
Rank #102 #107
Reliability 10.0 10.0
Consistency 9.4 8.5
Tests Correct
Attempt pass rate 69.8% 57.1%
Flaky tests 1 4
Total Runs 63 63
Cost per result 0.257 1.404
Total Cost $0.033 $0.141
Input Price $0.120 / 1M $1.000 / 1M
Output Price $0.350 / 1M $6.000 / 1M
Total Input Tokens 17,957 34,218
Output Tokens 22,356 2,110
Reasoning Tokens 65,726 15,571
Response Time (avg) 56.55s 4.35s
Response Time (max) 437.40s 18.06s
Response Time (total) 1074.41s 91.45s

Generation showcase

Hamster playing table tennis

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

#102 Gemma 4 31B

medium
Cost
$0.002
Time
45.7s
Tokens
2,696 tok

#107 GPT-5.6 Luna

low
Cost
$0.011
Time
10.2s
Tokens
1,897 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
Gemma 4 31B 10.0 10.0 100.0% 0 12.89s 816 962 2,046
GPT-5.6 Luna 8.3 10.0 75.0% 0 2.21s 606 186 722
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemma 4 31B 4.3 5.8 22.2% 1 219.76s 5,568 11,098 33,212
GPT-5.6 Luna 5.5 10.0 33.3% 0 4.61s 7,302 557 3,535
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemma 4 31B 3.0 10.0 0.0% 0 0ms 0 0 0
GPT-5.6 Luna 2.8 1.6 33.3% 1 7.99s 11,019 300 1,060
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemma 4 31B 10.0 10.0 100.0% 0 21.11s 8,334 1,822 2,951
GPT-5.6 Luna 10.0 10.0 100.0% 0 2.14s 7,140 234 292
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemma 4 31B 7.7 10.0 66.7% 0 38.48s 876 4,349 8,985
GPT-5.6 Luna 3.6 7.2 22.2% 1 10.05s 723 70 6,718
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemma 4 31B 10.0 10.0 100.0% 0 9.57s 567 105 888
GPT-5.6 Luna 5.0 10.0 0.0% 0 2.25s 477 122 169
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemma 4 31B 10.0 10.0 100.0% 0 12.76s 777 533 2,035
GPT-5.6 Luna 8.5 6.8 83.3% 1 2.04s 660 93 259
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemma 4 31B 9.9 10.0 100.0% 0 26.91s 801 1,795 5,595
GPT-5.6 Luna 7.6 7.2 77.8% 1 3.59s 642 271 1,207
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemma 4 31B 3.0 10.0 0.0% 0 0ms 0 0 0
GPT-5.6 Luna 10.0 10.0 100.0% 0 4.43s 5,454 250 177
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemma 4 31B 3.0 10.0 0.0% 0 90.14s 218 1,692 10,014
GPT-5.6 Luna 3.0 10.0 0.0% 0 4.86s 195 27 1,432

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