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Google: Gemini 3.5 Flash vs OpenAI: GPT-5.6 Luna

Summary

Gemini 3.5 Flash (high) vs GPT-5.6 Luna benchmark comparison: Gemini 3.5 Flash (high) leads on average score with 9.8 vs 5.3. GPT-5.6 Luna has the lower benchmark cost at $0.047 vs $1.115. GPT-5.6 Luna is faster at 1.06s vs 8.84s, with pass rates of 96.8% vs 36.5%.

Recommended model: Gemini 3.5 Flash (high) - It has the strongest score in this comparison (9.8) and the best overall balance of cost and response time across all 2 models.

Last updated at: 2026-07-09

Metric Gemini 3.5 Flash Gemini 3.5 Flash high Release: 2026-05-19 GPT-5.6 Luna GPT-5.6 Luna none Release: 2026-07-09
Score 9.8 5.3
Rank #1 #142
Reliability 10.0 10.0
Consistency 9.6 8.8
Tests Correct
Attempt pass rate 96.8% 36.5%
Flaky tests 1 3
Total Runs 63 63
Cost per result 5.575 0.767
Total Cost $1.115 $0.047
Input Price $1.500 / 1M $1.000 / 1M
Output Price $9.000 / 1M $6.000 / 1M
Total Input Tokens 37,594 34,218
Output Tokens 1,975 1,967
Reasoning Tokens 115,638 0
Response Time (avg) 8.84s 1.06s
Response Time (max) 34.82s 2.80s
Response Time (total) 185.57s 22.34s

Generation showcase

Hamster playing table tennis

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

#1 Gemini 3.5 Flash

high
Cost
$0.208
Time
118.2s
Tokens
23,158 tok

#142 GPT-5.6 Luna

none
Cost
$0.016
Time
15.8s
Tokens
2,685 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 3.5 Flash 10.0 10.0 100.0% 0 2.57s 492 174 4,997
GPT-5.6 Luna 4.8 10.0 25.0% 0 901ms 606 266 0
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 22.96s 8,118 456 47,129
GPT-5.6 Luna 3.8 7.2 22.2% 1 980ms 7,302 459 0
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 22.37s 12,873 351 16,323
GPT-5.6 Luna 3.0 10.0 0.0% 0 2.78s 11,019 280 0
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 6.43s 7,548 279 8,466
GPT-5.6 Luna 10.0 10.0 100.0% 0 758ms 7,140 222 0
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 7.6 7.2 77.8% 1 14.09s 633 12 24,721
GPT-5.6 Luna 2.9 7.2 11.1% 1 737ms 723 54 0
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 3.63s 486 115 1,650
GPT-5.6 Luna 5.0 10.0 0.0% 0 1.00s 477 150 0
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 3.35s 615 70 3,799
GPT-5.6 Luna 7.1 5.8 83.3% 1 1.23s 660 86 0
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 3.23s 558 241 4,940
GPT-5.6 Luna 5.3 10.0 33.3% 0 790ms 642 202 0
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 9.8 10.0 100.0% 0 4.96s 6,115 265 1,608
GPT-5.6 Luna 10.0 10.0 100.0% 0 2.80s 5,454 222 0
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 10.0 10.0 100.0% 0 3.94s 156 12 2,005
GPT-5.6 Luna 3.0 10.0 0.0% 0 651ms 195 26 0

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