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GPT-5.6 Luna (low) vs gpt-oss-120b (medium)

The average score is effectively tied at 6.2 vs 6.1. gpt-oss-120b (medium) has the lower benchmark cost at $0.019 vs $0.026. GPT-5.6 Luna (low) is faster at 5.20s vs 20.81s, with pass rates of 54.5% vs 50.0%.

Last updated at: 2026-08-15

Rank
#165
Total Output Tokens
26,286
Response Time (avg)
5.20s
Total Cost
$0.026
Rank
#169
Total Output Tokens
98,282
Response Time (avg)
20.81s
Total Cost
$0.019
Recommended model GPT-5.6 Luna (low)

It has the best score here (6.2), while responding about 4.0x faster than gpt-oss-120b (medium).

Detailed comparison

Metric GPT-5.6 Luna GPT-5.6 Luna low Release: 2026-07-09 gpt-oss-120b gpt-oss-120b medium Release: 2025-08-05
Score 6.2 6.1
Rank #165 #169
Reliability 10.0 10.0
Consistency 8.2 8.0
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 54.5% 50.0%
Flaky tests 5 5
Total Runs 66 66
Cost per result 2.437 0.224
Total Cost $0.026 $0.019
Input Price $0.100 / 1M $0.030 / 1M
Output Price $0.600 / 1M $0.170 / 1M
Total Input Tokens 96,355 108,767
Output Tokens 8,213 29,378
Reasoning Tokens 18,073 68,904
Response Time (avg) 5.20s 20.81s
Response Time (max) 19.44s 68.16s
Response Time (total) 114.46s 332.88s
Parameters ~400B total (~17B active) 117B total (5.1B active)
Availability Closed Open source

Model generation showcase

Hamster playing table tennis

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

#165 GPT-5.6 Luna

low
Cost
$0.011
Time
10.2s
Tokens
1,897 tok

#169 gpt-oss-120b

medium
Cost
$0.001
Time
26.7s
Tokens
555 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 5.5 10.0 33.3% 0 4.61s 7,302 557 3,535
gpt-oss-120b 5.9 7.0 55.6% 1 38.37s 7,782 3,365 11,973

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