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GPT-5.6 Luna (medium) vs Grok Build 0.1 (medium)

The average score is effectively tied at 7.4 vs 7.5. GPT-5.6 Luna (medium) has the lower benchmark cost at $0.072 vs $1.130. GPT-5.6 Luna (medium) is faster at 7.43s vs 54.50s, with pass rates of 62.1% vs 60.6%.

Last updated at: 2026-09-18

Compared models

Rank
#116
Total Output Tokens
44,525
Response Time (avg)
7.43s
Total Cost
$0.072
Rank
#111
Total Output Tokens
511,406
Response Time (avg)
54.50s
Total Cost
$1.130
Recommended model GPT-5.6 Luna (medium)

It has the best score here (7.4), while costing about 15.8x less than Grok Build 0.1 (medium).

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 7.4 7.5
Rank #116 #111
Reliability 10.0 10.0
Consistency 9.2 9.6
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 62.1% 60.6%
Flaky tests 2 1
Total Runs 66 66
Cost per result 2.601 8.691
Total Cost $0.072 $1.130
Input Price $0.200 / 1M $1.000 / 1M
Output Price $1.200 / 1M $2.000 / 1M
Total Input Tokens 89,685 106,946
Output Tokens 5,701 7,993
Reasoning Tokens 38,824 503,413
Response Time (avg) 7.43s 54.50s
Response Time (max) 29.85s 252.69s
Response Time (total) 163.54s 1199.07s
Parameters ~400B total (~17B active) ~300B total (~30B active)
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#116 GPT-5.6 Luna

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

#111 SpaceXAI: 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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