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Claude Sonnet 5.5 (low) vs GPT-5.6 Luna (low)

The average score is effectively tied at 6.9 vs 6.9. GPT-5.6 Luna (low) has the lower benchmark cost at $0.049 vs $0.909. GPT-5.6 Luna (low) is faster at 6.96s vs 7.46s, with pass rates of 46.4% vs 56.5%.

Last updated at: 2026-11-13

Compared models

Rank
#238
Total Output Tokens
32,443
Response Time (avg)
7.46s
Total Cost
$0.909
Rank
#237
Total Output Tokens
28,001
Response Time (avg)
6.96s
Total Cost
$0.049
Recommended model GPT-5.6 Luna (low)

It has the best score here (6.9), while costing about 18.6x less than Claude Sonnet 5.5 (low).

Detailed comparison

Metric Claude Sonnet 5.5 Claude Sonnet 5.5 low Release: 2026-09-29 GPT-5.6 Luna GPT-5.6 Luna low Release: 2026-07-09
Score 6.9 6.9
Rank #238 #237
Reliability 10.0 10.0
Consistency 9.4 8.3
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 46.4% 56.5%
Flaky tests 2 5
Total Runs 69 69
Cost per result 9.082 2.428
Total Cost $0.909 $0.049
Input Price $2.000 / 1M $0.200 / 1M
Output Price $10.000 / 1M $1.200 / 1M
Cache Read Price $0.200 / 1M $0.020 / 1M
Cache Write Price $2.500 / 1M $0.250 / 1M
Total Input Tokens 291,853 202,680
Output Tokens 24,116 9,230
Reasoning Tokens 8,327 18,771
Response Time (avg) 7.46s 6.96s
Response Time (max) 46.61s 45.74s
Response Time (total) 171.47s 160.19s
Parameters ~1T total (~100B active) ~400B total (~17B active)
Availability Closed Closed

Cache prices apply to input tokens. Reads reuse cached prompts; writes store them and can cost extra. Output tokens use the output price.

Model generation showcase

Hamster playing table tennis

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

#238 Claude Sonnet 5.5

low
Cost
$0.020
Time
15.3s
Tokens
2,077 tok

#237 GPT-5.6 Luna

low
Cost
$0.011
Time
10.2s
Tokens
1,897 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
Claude Sonnet 5.5 3.2 9.7 0.0% 0 5.81s 10,608 5,903 0
GPT-5.6 Luna 5.5 10.0 33.3% 0 4.61s 7,302 557 3,535

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