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Claude Sonnet 5.5 (xhigh) vs GPT-6 Luna (high)

The average score is effectively tied at 8.3 vs 8.3. GPT-6 Luna (high) has the lower benchmark cost at $0.054 vs $1.069. Claude Sonnet 5.5 (xhigh) is faster at 13.17s vs 17.53s, with pass rates of 78.8% vs 75.8%.

Last updated at: 2026-09-29

Compared models

Rank
#79
Total Output Tokens
77,105
Response Time (avg)
13.17s
Total Cost
$1.069
Rank
#81
Total Output Tokens
91,405
Response Time (avg)
17.53s
Total Cost
$0.054
Recommended model GPT-6 Luna (high)

It has the best score here (8.3), while costing about 19.9x less than Claude Sonnet 5.5 (xhigh).

Detailed comparison

Metric Claude Sonnet 5.5 Claude Sonnet 5.5 xhigh Release: 2026-09-29 GPT-6 Luna GPT-6 Luna high Release: 2026-09-23
Score 8.3 8.3
Rank #79 #81
Reliability 10.0 10.0
Consistency 8.7 9.0
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 78.8% 75.8%
Flaky tests 4 3
Total Runs 66 66
Cost per result 7.123 0.359
Total Cost $1.069 $0.054
Input Price $2.000 / 1M $0.100 / 1M
Output Price $10.000 / 1M $0.500 / 1M
Total Input Tokens 148,643 80,441
Output Tokens 9,700 4,761
Reasoning Tokens 67,405 86,644
Response Time (avg) 13.17s 17.53s
Response Time (max) 54.91s 106.93s
Response Time (total) 289.67s 385.74s
Parameters ~1T 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.

#79 Claude Sonnet 5.5

xhigh
Cost
$0.319
Time
258.6s
Tokens
31,969 tok

#81 GPT-6 Luna

high
Cost
$0.003
Time
49.2s
Tokens
5,231 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 8.2 7.2 88.9% 1 11.90s 10,608 555 9,501
GPT-6 Luna 7.8 7.4 77.8% 1 24.69s 7,302 483 15,691

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