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

Summary

Gemma 4 31B vs GPT-5.6 Luna (low) benchmark comparison: GPT-5.6 Luna (low) leads on average score with 6.2 vs 6.1. Gemma 4 31B has the lower benchmark cost at $0.004 vs $0.141. Gemma 4 31B is faster at 4.05s vs 4.35s, with pass rates of 47.6% vs 57.1%.

Recommended model: Gemma 4 31B - Its score stays close to the best score here (6.1 vs 6.2), while costing about 46.7x less than GPT-5.6 Luna (low).

Last updated at: 2026-07-09

Metric Gemma 4 31B Gemma 4 31B none Release: 2026-04-02 Free Available GPT-5.6 Luna GPT-5.6 Luna low Release: 2026-07-09
Score 6.1 6.2
Rank #113 #107
Reliability 10.0 10.0
Consistency 10.0 8.5
Tests Correct
Attempt pass rate 47.6% 57.1%
Flaky tests 0 4
Total Runs 63 63
Cost per result 0.034 1.404
Total Cost $0.004 $0.141
Input Price $0.120 / 1M $1.000 / 1M
Output Price $0.350 / 1M $6.000 / 1M
Total Input Tokens 20,911 34,218
Output Tokens 1,407 2,110
Reasoning Tokens 0 15,571
Response Time (avg) 4.05s 4.35s
Response Time (max) 26.13s 18.06s
Response Time (total) 76.87s 91.45s

Generation showcase

Hamster playing table tennis

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

#113 Gemma 4 31B

none
Cost
$0.001
Time
12.8s
Tokens
795 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 6.5 10.0 50.0% 0 1.85s 852 45 0
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 5.5 10.0 33.3% 0 11.19s 8,381 735 0
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 2.25s 8,352 285 0
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 3.22s 903 27 0
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 2.09s 576 117 0
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 6.5 10.0 50.0% 0 2.84s 795 78 0
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 6.5 10.0 33.3% 0 4.23s 828 108 0
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 1.25s 224 12 0
GPT-5.6 Luna 3.0 10.0 0.0% 0 4.86s 195 27 1,432

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