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Gemini 3.5 Flash vs GPT-5.6 Luna (medium)

GPT-5.6 Luna (medium) leads on average score with 7.4 vs 6.1. GPT-5.6 Luna (medium) has the lower benchmark cost at $0.065 vs $1.752. GPT-5.6 Luna (medium) is faster at 9.64s vs 14.13s, with pass rates of 68.1% vs 62.3%.

Last updated at: 2026-10-02

Compared models

Rank
#232
Total Output Tokens
153,595
Response Time (avg)
14.13s
Total Cost
$1.752
Rank
#122
Total Output Tokens
47,986
Response Time (avg)
9.64s
Total Cost
$0.065
Recommended model GPT-5.6 Luna (medium)

It has the best score here (7.4), while costing about 27.2x less than Gemini 3.5 Flash.

Detailed comparison

Metric Gemini 3.5 Flash Gemini 3.5 Flash none Release: 2026-05-19 GPT-5.6 Luna GPT-5.6 Luna medium Release: 2026-07-09
Score 6.1 7.4
Rank #232 #122
Reliability 10.0 10.0
Consistency 8.6 9.0
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 68.1% 62.3%
Flaky tests 4 3
Total Runs 69 69
Cost per result 12.511 2.822
Total Cost $1.752 $0.065
Input Price $1.500 / 1M $0.200 / 1M
Output Price $9.000 / 1M $1.200 / 1M
Cache Read Price $0.150 / 1M $0.020 / 1M
Cache Write Price $0.084 / 1M $0.250 / 1M
Total Input Tokens 246,061 212,780
Output Tokens 153,595 6,849
Reasoning Tokens 0 41,137
Response Time (avg) 14.13s 9.64s
Response Time (max) 85.26s 58.09s
Response Time (total) 268.55s 221.62s
Parameters ~500B total (~20B active) ~400B total (~17B active)
Availability Closed Closed

Cache prices apply to input tokens. Reads reuse cached prompts; writes store them and can cost extra. Output tokens use the output price.

Model generation showcase

Hamster playing table tennis

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

#232 Gemini 3.5 Flash

none
Cost
$0.225
Time
125.5s
Tokens
25,004 tok

#122 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

Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.5 Flash 8.8 7.8 88.9% 1 34.69s 8,122 75,927 0
GPT-5.6 Luna 5.4 7.2 44.4% 1 10.38s 7,302 564 9,928

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