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GPT-5.6 Luna (low) vs GLM 5.3 FlashX (low)

GLM 5.3 FlashX (low) leads on average score with 6.3 vs 6.2. GPT-5.6 Luna (low) has the lower benchmark cost at $0.051 vs $0.090. GPT-5.6 Luna (low) is faster at 5.20s vs 6.58s, with pass rates of 54.5% vs 65.2%.

Last updated at: 2026-09-21

Compared models

Rank
#205
Total Output Tokens
26,286
Response Time (avg)
5.20s
Total Cost
$0.051
Rank
#201
Total Output Tokens
37,036
Response Time (avg)
6.58s
Total Cost
$0.090
Recommended model GPT-5.6 Luna (low)

Its score stays close to the best score here (6.2 vs 6.3), while costing about 1.8x less than GLM 5.3 FlashX (low).

Detailed comparison

Metric GPT-5.6 Luna GPT-5.6 Luna low Release: 2026-07-09 GLM 5.3 FlashX GLM 5.3 FlashX low Release: 2026-09-21
Score 6.2 6.3
Rank #205 #201
Reliability 10.0 10.0
Consistency 8.2 7.0
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 54.5% 65.2%
Flaky tests 5 8
Total Runs 66 66
Cost per result 2.437 0.816
Total Cost $0.051 $0.090
Input Price $0.200 / 1M $0.370 / 1M
Output Price $1.200 / 1M $1.250 / 1M
Total Input Tokens 96,355 117,325
Output Tokens 8,213 10,494
Reasoning Tokens 18,073 26,542
Response Time (avg) 5.20s 6.58s
Response Time (max) 19.44s 73.01s
Response Time (total) 114.46s 144.85s
Parameters ~400B total (~17B active) 320B total (18B active)
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#205 GPT-5.6 Luna

low
Cost
$0.011
Time
10.2s
Tokens
1,897 tok

#201 GLM 5.3 FlashX

low
Cost
$0.002
Time
8.4s
Tokens
1,526 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-5.6 Luna 5.5 10.0 33.3% 0 4.61s 7,302 557 3,535
GLM 5.3 FlashX 5.5 7.4 44.4% 1 5.45s 7,317 382 4,760

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