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OpenAI: GPT-5.3 Chat vs OpenAI: GPT-5.6 Luna

GPT-5.6 Luna (medium) leads on average score with 7.6 vs 7.5. GPT-5.6 Luna (medium) has the lower benchmark cost at $0.352 vs $0.571. GPT-5.3 Chat is faster at 6.88s vs 7.28s, with pass rates of 68.2% vs 65.2%.

Recommended modelGPT-5.6 Luna (medium)It has the best score here (7.6), while costing about 1.6x less than GPT-5.3 Chat.

Last updated at: 2026-07-17

Metric GPT-5.3 Chat GPT-5.3 Chat none Release: 2026-03-03 GPT-5.6 Luna GPT-5.6 Luna medium Release: 2026-07-09
Score 7.5 7.6
Rank #52 #48
Reliability 10.0 10.0
Consistency 8.2 9.6
Tests Correct
Attempt pass rate 68.2% 65.2%
Flaky tests 5 1
Total Runs 66 66
Cost per result 4.387 2.513
Total Cost $0.571 $0.352
Input Price $1.750 / 1M $1.000 / 1M
Output Price $14.000 / 1M $6.000 / 1M
Total Input Tokens 78,990 89,676
Output Tokens 30,854 5,699
Reasoning Tokens 0 37,980
Response Time (avg) 6.88s 7.28s
Response Time (max) 18.33s 29.85s
Response Time (total) 151.31s 160.27s

Hamster playing table tennis

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

#52 GPT-5.3 Chat

none
Cost
$0.008
Time
8.1s
Tokens
634 tok

#48 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-5.3 Chat 5.6 4.7 55.6% 2 10.52s 7,302 6,632 0
GPT-5.6 Luna 5.4 7.2 44.4% 1 10.38s 7,302 564 9,928

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