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Claude Opus 5 vs GPT-5.6 Luna (high)

The average score is effectively tied at 7.5 vs 7.6. GPT-5.6 Luna (high) has the lower benchmark cost at $0.179 vs $1.550. Claude Opus 5 is faster at 7.65s vs 16.49s, with pass rates of 57.6% vs 69.7%.

Last updated at: 2026-09-08

Compared models

Rank
#97
Total Output Tokens
24,866
Response Time (avg)
7.65s
Total Cost
$1.550
Rank
#94
Total Output Tokens
135,315
Response Time (avg)
16.49s
Total Cost
$0.179
Recommended model GPT-5.6 Luna (high)

It has the best score here (7.6), while costing about 8.7x less than Claude Opus 5.

Detailed comparison

Metric Claude Opus 5 Claude Opus 5 none Release: 2026-07-25 GPT-5.6 Luna GPT-5.6 Luna high Release: 2026-07-09
Score 7.5 7.6
Rank #97 #94
Reliability 10.0 10.0
Consistency 9.6 8.5
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 57.6% 69.7%
Flaky tests 1 4
Total Runs 66 66
Cost per result 12.912 6.100
Total Cost $1.550 $0.179
Input Price $5.000 / 1M $0.200 / 1M
Output Price $25.000 / 1M $1.200 / 1M
Total Input Tokens 185,547 80,927
Output Tokens 24,866 5,088
Reasoning Tokens 0 130,227
Response Time (avg) 7.65s 16.49s
Response Time (max) 47.72s 111.09s
Response Time (total) 168.35s 362.78s
Parameters ~5T total (~500B 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.

#97 Claude Opus 5

none
Cost
$0.271
Time
149.3s
Tokens
10,962 tok

#94 GPT-5.6 Luna

high
Cost
$0.033
Time
34.2s
Tokens
5,484 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 Opus 5 5.9 9.7 33.3% 0 5.54s 10,590 2,886 0
GPT-5.6 Luna 5.5 4.7 55.6% 2 15.63s 7,302 510 17,746

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