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OpenAI: GPT-5.6 Luna vs xAI: Grok Build 0.1

The average score is effectively tied at 7.6 vs 7.6. GPT-5.6 Luna (medium) has the lower benchmark cost at $0.352 vs $1.097. GPT-5.6 Luna (medium) is faster at 7.28s vs 52.06s, with pass rates of 65.2% vs 63.6%.

Recommended modelGPT-5.6 Luna (medium)It has the best score here (7.6), while costing about 3.1x less than Grok Build 0.1 (medium).

Last updated at: 2026-07-25

Comparison summary

Rank
#57
Total Output Tokens
43,679
Response Time (avg)
7.28s
Total Cost
$0.352
Rank
#55
Total Output Tokens
494,663
Response Time (avg)
52.06s
Total Cost
$1.097

Detailed comparison

Metric GPT-5.6 Luna GPT-5.6 Luna medium Release: 2026-07-09 Grok Build 0.1 Grok Build 0.1 medium Release: 2026-05-21
Score 7.6 7.6
Rank #57 #55
Reliability 10.0 10.0
Consistency 9.6 10.0
Tests Correct
Attempt pass rate 65.2% 63.6%
Flaky tests 1 0
Total Runs 66 66
Cost per result 2.513 7.830
Total Cost $0.352 $1.097
Input Price $1.000 / 1M $1.000 / 1M
Output Price $6.000 / 1M $2.000 / 1M
Total Input Tokens 89,676 106,751
Output Tokens 5,699 7,993
Reasoning Tokens 37,980 486,670
Response Time (avg) 7.28s 52.06s
Response Time (max) 29.85s 252.69s
Response Time (total) 160.27s 1145.27s

Hamster playing table tennis

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

#57 GPT-5.6 Luna

medium
Cost
$0.014
Time
14.6s
Tokens
2,362 tok

#55 xAI: Grok Build 0.1

medium
Cost
$0.028
Time
81.3s
Tokens
14,009 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 5.4 7.2 44.4% 1 10.38s 7,302 564 9,928
Grok Build 0.1 5.7 9.7 33.3% 0 108.46s 8,304 1,138 161,452

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