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Google: Gemini 3 Flash Preview vs OpenAI: GPT-5.6 Luna

Summary

Gemini 3 Flash Preview (low) vs GPT-5.6 Luna (medium) benchmark comparison: GPT-5.6 Luna (medium) leads on average score with 7.6 vs 7.4. Gemini 3 Flash Preview (low) has the lower benchmark cost at $0.111 vs $0.258. Gemini 3 Flash Preview (low) is faster at 5.76s vs 6.70s, with pass rates of 79.4% vs 63.5%.

Recommended model: Gemini 3 Flash Preview (low) - Its score stays close to the best score here (7.4 vs 7.6), while costing about 2.3x less than GPT-5.6 Luna (medium).

Last updated at: 2026-07-09

Metric Gemini 3 Flash Preview Gemini 3 Flash Preview low Release: 2025-12-17 GPT-5.6 Luna GPT-5.6 Luna medium Release: 2026-07-09
Score 7.4 7.6
Rank #64 #54
Reliability 10.0 10.0
Consistency 9.2 9.6
Tests Correct
Attempt pass rate 79.4% 63.5%
Flaky tests 2 1
Total Runs 63 63
Cost per result 0.689 1.978
Total Cost $0.111 $0.258
Input Price $0.500 / 1M $1.000 / 1M
Output Price $3.000 / 1M $6.000 / 1M
Total Input Tokens 36,769 35,699
Output Tokens 2,076 2,148
Reasoning Tokens 28,518 34,740
Response Time (avg) 5.76s 6.70s
Response Time (max) 14.72s 29.85s
Response Time (total) 120.93s 140.62s

Generation showcase

Hamster playing table tennis

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

#64 Gemini 3 Flash Preview

low
Cost
$0.007
Time
12.1s
Tokens
2,289 tok

#54 GPT-5.6 Luna

medium
Cost
$0.014
Time
14.6s
Tokens
2,362 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
Gemini 3 Flash Preview 10.0 10.0 100.0% 0 3.48s 500 281 3,082
GPT-5.6 Luna 8.3 10.0 75.0% 0 2.52s 606 160 987
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3 Flash Preview 5.8 7.2 44.4% 1 6.00s 8,122 456 7,421
GPT-5.6 Luna 5.4 7.2 44.4% 1 10.38s 7,302 564 9,928
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3 Flash Preview 3.0 10.0 0.0% 0 3.27s 12,860 326 0
GPT-5.6 Luna 10.0 10.0 100.0% 0 9.53s 12,500 375 1,354
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3 Flash Preview 10.0 10.0 100.0% 0 9.40s 7,261 279 3,656
GPT-5.6 Luna 10.0 10.0 100.0% 0 1.95s 7,140 234 324
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3 Flash Preview 5.3 7.2 44.4% 1 8.05s 645 12 6,410
GPT-5.6 Luna 5.3 10.0 33.3% 0 17.37s 723 68 16,531
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3 Flash Preview 10.0 10.0 100.0% 0 3.68s 492 120 981
GPT-5.6 Luna 5.1 10.0 0.0% 0 4.34s 477 112 496
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3 Flash Preview 9.9 10.0 100.0% 0 7.02s 621 71 2,752
GPT-5.6 Luna 9.9 10.0 100.0% 0 2.38s 660 95 393
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3 Flash Preview 10.0 10.0 100.0% 0 5.77s 562 288 3,168
GPT-5.6 Luna 7.8 10.0 66.7% 0 4.04s 642 255 2,104
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3 Flash Preview 10.0 10.0 100.0% 0 4.99s 5,550 234 415
GPT-5.6 Luna 10.0 10.0 100.0% 0 6.02s 5,454 256 244
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3 Flash Preview 10.0 10.0 100.0% 0 2.75s 156 9 633
GPT-5.6 Luna 3.0 10.0 0.0% 0 6.64s 195 29 2,379

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