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GPT-5.4 Mini (medium) vs GPT-5.6 Luna (medium)

The average score is effectively tied at 7.5 vs 7.4. GPT-5.6 Luna (medium) has the lower benchmark cost at $0.072 vs $0.786. GPT-5.6 Luna (medium) is faster at 7.43s vs 26.72s, with pass rates of 68.2% vs 62.1%.

Last updated at: 2026-08-20

Rank
#88
Total Output Tokens
158,344
Response Time (avg)
26.72s
Total Cost
$0.786
Rank
#93
Total Output Tokens
44,525
Response Time (avg)
7.43s
Total Cost
$0.072
Recommended model GPT-5.6 Luna (medium)

It has the best score here (7.4), while costing about 11.0x less than GPT-5.4 Mini (medium).

Detailed comparison

Metric GPT-5.4 Mini GPT-5.4 Mini medium Release: 2026-03-17 GPT-5.6 Luna GPT-5.6 Luna medium Release: 2026-07-09
Score 7.5 7.4
Rank #88 #93
Reliability 10.0 10.0
Consistency 8.1 9.2
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 68.2% 62.1%
Flaky tests 5 2
Total Runs 66 66
Cost per result 6.546 2.601
Total Cost $0.786 $0.072
Input Price $0.750 / 1M $0.200 / 1M
Output Price $4.500 / 1M $1.200 / 1M
Total Input Tokens 97,164 89,685
Output Tokens 6,211 5,701
Reasoning Tokens 152,133 38,824
Response Time (avg) 26.72s 7.43s
Response Time (max) 138.75s 29.85s
Response Time (total) 587.90s 163.54s
Parameters ~400B total (~17B active) ~400B total (~17B active)
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#88 GPT-5.4 Mini

medium
Cost
$0.056
Time
95.5s
Tokens
12,464 tok

#93 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
GPT-5.4 Mini 8.4 7.4 88.9% 1 57.87s 7,305 467 40,902
GPT-5.6 Luna 5.4 7.2 44.4% 1 10.38s 7,302 564 9,928

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