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GPT-5.4 Nano (medium) vs GPT-5.6 Luna (high)

The average score is effectively tied at 7.5 vs 7.6. GPT-5.4 Nano (medium) has the lower benchmark cost at $0.142 vs $0.179. GPT-5.4 Nano (medium) is faster at 13.32s vs 16.49s, with pass rates of 65.2% vs 69.7%.

Last updated at: 2026-08-20

Rank
#82
Total Output Tokens
99,881
Response Time (avg)
13.32s
Total Cost
$0.142
Rank
#78
Total Output Tokens
135,315
Response Time (avg)
16.49s
Total Cost
$0.179
Recommended model GPT-5.4 Nano (medium)

It has the strongest score in this comparison (7.5) and the best overall balance of cost and response time across all 2 models.

Detailed comparison

Metric GPT-5.4 Nano GPT-5.4 Nano medium Release: 2026-03-17 GPT-5.6 Luna GPT-5.6 Luna high Release: 2026-07-09
Score 7.5 7.6
Rank #82 #78
Reliability 10.0 10.0
Consistency 8.5 8.5
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 65.2% 69.7%
Flaky tests 4 4
Total Runs 66 66
Cost per result 1.179 6.100
Total Cost $0.142 $0.179
Input Price $0.200 / 1M $0.200 / 1M
Output Price $1.250 / 1M $1.200 / 1M
Total Input Tokens 82,828 80,927
Output Tokens 7,100 5,088
Reasoning Tokens 92,781 130,227
Response Time (avg) 13.32s 16.49s
Response Time (max) 94.06s 111.09s
Response Time (total) 292.97s 362.78s
Parameters ~120B total (~5B 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.

#82 GPT-5.4 Nano

medium
Cost
$0.007
Time
24.6s
Tokens
4,943 tok

#78 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
GPT-5.4 Nano 6.1 4.7 66.7% 2 19.12s 7,305 516 20,778
GPT-5.6 Luna 5.5 4.7 55.6% 2 15.63s 7,302 510 17,746

Quick Compare

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