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GPT-6 Luna (low) vs Grok 4.20 (medium)

The average score is effectively tied at 7.0 vs 7.0. GPT-6 Luna (low) has the lower benchmark cost at $0.020 vs $0.805. GPT-6 Luna (low) is faster at 21.96s vs 32.56s, with pass rates of 62.1% vs 60.6%.

Last updated at: 2026-09-23

Compared models

Rank
#159
Total Output Tokens
22,605
Response Time (avg)
21.96s
Total Cost
$0.020
Rank
#164
Total Output Tokens
270,259
Response Time (avg)
32.56s
Total Cost
$0.805
Recommended model GPT-6 Luna (low)

It has the best score here (7.0), while costing about 41.6x less than Grok 4.20 (medium).

Detailed comparison

Metric GPT-6 Luna GPT-6 Luna low Release: 2026-09-23 Grok 4.20 Grok 4.20 medium Release: 2026-03-31
Score 7.0 7.0
Rank #159 #164
Reliability 9.6 10.0
Consistency 8.5 8.2
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 62.1% 60.6%
Flaky tests 4 5
Total Runs 66 66
Cost per result 0.176 10.365
Total Cost $0.020 $0.805
Input Price $0.100 / 1M $1.250 / 1M
Output Price $0.500 / 1M $2.500 / 1M
Total Input Tokens 80,159 102,986
Output Tokens 4,623 5,860
Reasoning Tokens 17,982 264,399
Response Time (avg) 21.96s 32.56s
Response Time (max) 89.37s 199.66s
Response Time (total) 483.19s 716.36s
Parameters ~400B total (~17B active) ~1T total (~100B active)
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#159 GPT-6 Luna

low
Cost
$0.002
Time
19.2s
Tokens
2,598 tok

#164 SpaceXAI: Grok 4.20

medium
Cost
$0.041
Time
110.3s
Tokens
16,336 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-6 Luna 6.0 7.2 55.6% 1 15.39s 7,302 493 6,655
Grok 4.20 6.3 6.6 55.6% 1 109.93s 8,307 268 103,150

Quick Compare

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