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Google: Gemini 2.5 Flash vs OpenAI: GPT-5.6 Luna

Gemini 2.5 Flash (medium) leads on average score with 8.2 vs 7.7. Gemini 2.5 Flash (medium) has the lower benchmark cost at $0.643 vs $1.017. GPT-5.6 Luna (high) is faster at 18.68s vs 21.18s, with pass rates of 71.2% vs 72.7%.

Recommended modelGemini 2.5 Flash (medium)It has the best score here (8.2), while costing about 1.6x less than GPT-5.6 Luna (high).

Last updated at: 2026-07-17

Metric Gemini 2.5 Flash Gemini 2.5 Flash medium Release: 2025-06-17 GPT-5.6 Luna GPT-5.6 Luna high Release: 2026-07-09
Score 8.2 7.7
Rank #25 #42
Reliability 10.0 10.0
Consistency 9.6 8.9
Tests Correct
Attempt pass rate 71.2% 72.7%
Flaky tests 1 3
Total Runs 66 66
Cost per result 4.286 6.780
Total Cost $0.643 $1.017
Input Price $0.300 / 1M $1.000 / 1M
Output Price $2.500 / 1M $6.000 / 1M
Total Input Tokens 132,498 80,918
Output Tokens 12,739 5,088
Reasoning Tokens 228,464 150,910
Response Time (avg) 21.18s 18.68s
Response Time (max) 140.50s 111.09s
Response Time (total) 465.89s 411.05s

Hamster playing table tennis

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

#25 Gemini 2.5 Flash

medium
Invalid SVG
Cost
$0.000
Time
274.0s
Tokens
0 tok

#42 GPT-5.6 Luna

high
Cost
$0.033
Time
34.2s
Tokens
5,484 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

Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 2.5 Flash 7.8 10.0 66.7% 0 41.01s 6,669 543 32,303
GPT-5.6 Luna 5.5 4.7 55.6% 2 15.63s 7,302 510 17,746

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