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Claude Opus 5 vs OpenAI: GPT-5.6 Luna

GPT-5.6 Luna (high) leads on average score with 7.7 vs 7.5. GPT-5.6 Luna (high) has the lower benchmark cost at $1.017 vs $1.550. Claude Opus 5 is faster at 7.60s vs 18.68s, with pass rates of 57.6% vs 72.7%.

Recommended modelGPT-5.6 Luna (high)It has the best score here (7.7), while costing about 1.5x less than Claude Opus 5.

Last updated at: 2026-07-25

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 7.7
Rank #59 #51
Reliability 10.0 10.0
Consistency 9.6 8.9
Tests Correct
Attempt pass rate 57.6% 72.7%
Flaky tests 1 3
Total Runs 66 66
Cost per result 12.912 6.780
Total Cost $1.550 $1.017
Input Price $5.000 / 1M $1.000 / 1M
Output Price $25.000 / 1M $6.000 / 1M
Total Input Tokens 185,550 80,918
Output Tokens 24,866 5,088
Reasoning Tokens 0 150,910
Response Time (avg) 7.60s 18.68s
Response Time (max) 47.72s 111.09s
Response Time (total) 167.28s 411.05s

Hamster playing table tennis

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

#59 Claude Opus 5

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

#51 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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