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GPT-5.6 Luna (medium) vs Grok 4.20 (medium)

GPT-5.6 Luna (medium) leads on average score with 7.4 vs 6.3. GPT-5.6 Luna (medium) has the lower benchmark cost at $0.065 vs $1.246. GPT-5.6 Luna (medium) is faster at 9.64s vs 36.73s, with pass rates of 62.3% vs 58.0%.

Last updated at: 2026-10-01

Compared models

Rank
#122
Total Output Tokens
47,986
Response Time (avg)
9.64s
Total Cost
$0.065
Rank
#224
Total Output Tokens
302,087
Response Time (avg)
36.73s
Total Cost
$1.246
Recommended model GPT-5.6 Luna (medium)

It has the best score here (7.4), while costing about 19.3x less than Grok 4.20 (medium).

Detailed comparison

Metric GPT-5.6 Luna GPT-5.6 Luna medium Release: 2026-07-09 Grok 4.20 Grok 4.20 medium Release: 2026-03-31
Score 7.4 6.3
Rank #122 #224
Reliability 10.0 10.0
Consistency 9.0 8.2
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 62.3% 58.0%
Flaky tests 3 5
Total Runs 69 69
Cost per result 2.822 14.374
Total Cost $0.065 $1.246
Input Price $0.200 / 1M $1.250 / 1M
Output Price $1.200 / 1M $2.500 / 1M
Cache Read Price $0.020 / 1M $0.200 / 1M
Cache Write Price $0.250 / 1M N/A
Total Input Tokens 212,780 392,127
Output Tokens 6,849 7,754
Reasoning Tokens 41,137 294,333
Response Time (avg) 9.64s 36.73s
Response Time (max) 58.09s 199.66s
Response Time (total) 221.62s 844.68s
Parameters ~400B total (~17B active) ~1T total (~100B active)
Availability Closed Closed

Cache prices apply to input tokens. Reads reuse cached prompts; writes store them and can cost extra. Output tokens use the output price.

Model generation showcase

Hamster playing table tennis

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

#122 GPT-5.6 Luna

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

#224 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-5.6 Luna 5.4 7.2 44.4% 1 10.38s 7,302 564 9,928
Grok 4.20 6.3 6.6 55.6% 1 109.93s 8,307 268 103,150

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