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GPT-5.2 Chat vs GPT-6 Luna (medium)

The average score is effectively tied at 7.9 vs 7.9. GPT-6 Luna (medium) has the lower benchmark cost at $0.031 vs $0.594. GPT-5.2 Chat is faster at 7.73s vs 15.87s, with pass rates of 69.7% vs 72.7%.

Last updated at: 2026-09-23

Compared models

Rank
#91
Total Output Tokens
29,742
Response Time (avg)
7.73s
Total Cost
$0.594
Rank
#94
Total Output Tokens
45,154
Response Time (avg)
15.87s
Total Cost
$0.031
Recommended model GPT-6 Luna (medium)

It has the best score here (7.9), while costing about 19.5x less than GPT-5.2 Chat.

Detailed comparison

Metric GPT-5.2 Chat GPT-5.2 Chat none Release: 2025-12-11 GPT-6 Luna GPT-6 Luna medium Release: 2026-09-23
Score 7.9 7.9
Rank #91 #94
Reliability 10.0 10.0
Consistency 8.6 8.9
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 69.7% 72.7%
Flaky tests 4 3
Total Runs 66 66
Cost per result 4.564 0.218
Total Cost $0.594 $0.031
Input Price $1.750 / 1M $0.100 / 1M
Output Price $14.000 / 1M $0.500 / 1M
Total Input Tokens 101,104 78,946
Output Tokens 29,742 4,635
Reasoning Tokens 0 40,519
Response Time (avg) 7.73s 15.87s
Response Time (max) 38.52s 35.14s
Response Time (total) 162.40s 349.09s
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.

#91 GPT-5.2 Chat

none
Cost
$0.010
Time
15.3s
Tokens
797 tok

#94 GPT-6 Luna

medium
Cost
$0.002
Time
23.6s
Tokens
2,966 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-5.2 Chat 8.8 7.8 88.9% 1 9.82s 7,305 6,731 0
GPT-6 Luna 6.6 4.6 77.8% 2 23.63s 7,302 438 10,222

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