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GPT-5.5 vs GPT-6 Luna (low)

The average score is effectively tied at 7.0 vs 7.0. GPT-6 Luna (low) has the lower benchmark cost at $0.020 vs $0.544. GPT-5.5 is faster at 2.35s vs 21.96s, with pass rates of 59.1% vs 62.1%.

Last updated at: 2026-09-23

Compared models

Rank
#162
Total Output Tokens
4,915
Response Time (avg)
2.35s
Total Cost
$0.544
Rank
#159
Total Output Tokens
22,605
Response Time (avg)
21.96s
Total Cost
$0.020
Recommended model GPT-6 Luna (low)

It has the best score here (7.0), while costing about 28.2x less than GPT-5.5.

Detailed comparison

Metric GPT-5.5 GPT-5.5 none Release: 2026-04-24 GPT-6 Luna GPT-6 Luna low Release: 2026-09-23
Score 7.0 7.0
Rank #162 #159
Reliability 10.0 9.6
Consistency 9.2 8.5
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 59.1% 62.1%
Flaky tests 2 4
Total Runs 66 66
Cost per result 4.533 0.176
Total Cost $0.544 $0.020
Input Price $5.000 / 1M $0.100 / 1M
Output Price $30.000 / 1M $0.500 / 1M
Total Input Tokens 79,294 80,159
Output Tokens 4,915 4,623
Reasoning Tokens 0 17,982
Response Time (avg) 2.35s 21.96s
Response Time (max) 12.24s 89.37s
Response Time (total) 51.78s 483.19s
Parameters ~1.5T total (~100B 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.

#162 GPT-5.5

none
Cost
$0.090
Time
54.3s
Tokens
3,063 tok

#159 GPT-6 Luna

low
Cost
$0.002
Time
19.2s
Tokens
2,598 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-5.5 5.5 10.0 33.3% 0 1.35s 7,305 462 0
GPT-6 Luna 6.0 7.2 55.6% 1 15.39s 7,302 493 6,655

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