Models / GPT-5.6 Luna

OpenAI

GPT-5.6 Luna

27 published results from 2 sources. Each card shows where the number comes from and what it does not measure. Results are never combined into one score.

Provider
OpenAI
Sources
2
Our benchmarks
0
Price
Not yet published

Reported by others

Reported by Arena (formerly LMArena)
-0.05
Confirmed task success · rank 25 of 46
Unit
IPS effect estimate, higher is better
Range
-0.06 to -0.03
Sample
31264 observations
Configuration
GPT-5.6 Luna
Measured
28 Sep 2026
Not shown
Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.
Reported by Arena (formerly LMArena)
-0.04
Praise over complaint · rank 23 of 46
Unit
IPS effect estimate, higher is better
Range
-0.06 to -0.02
Sample
11564 observations
Configuration
GPT-5.6 Luna
Measured
28 Sep 2026
Not shown
Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.
Reported by Arena (formerly LMArena)
0.02
Steerability · rank 11 of 46
Unit
IPS effect estimate, higher is better
Range
0.01 to 0.03
Sample
39237 observations
Configuration
GPT-5.6 Luna
Measured
28 Sep 2026
Not shown
Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.
Reported by Arena (formerly LMArena)
0.00
Tool grounding · rank 1 of 46
Unit
IPS effect estimate, higher is better
Range
0.00 to 0.00
Sample
3288506 observations
Configuration
GPT-5.6 Luna
Measured
28 Sep 2026
Not shown
Not a success rate: the estimated effect of choosing this model as the agent's orchestrator, against an even mix of the models tested, inside Arena's own harness.
Reported by Arena (formerly LMArena)
1,462
Overall · rank 14 of 44
Unit
Arena rating, higher is better
Range
1,454 to 1,470
Sample
5766 votes
Configuration
GPT-5.6 Luna (xhigh)
Measured
13 Sep 2026
Not shown
Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
Reported by Arena (formerly LMArena)
1,461
Overall · rank 28 of 177
Unit
Arena rating, higher is better
Range
1,458 to 1,465
Sample
35475 votes
Configuration
GPT-5.6 Luna (xhigh)
Measured
25 Sep 2026
Not shown
Not an error rate: claims that cannot be checked on the web are skipped, and preference still carries most of the weight.
Reported by Arena (formerly LMArena)
1,463
Business, management and finance · rank 24 of 402
Unit
Arena rating, higher is better
Range
1,455 to 1,471
Sample
6871 votes
Configuration
GPT-5.6 Luna (xhigh)
Measured
25 Sep 2026
Not shown
Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
Reported by Arena (formerly LMArena)
1,412
Creative writing · rank 69 of 407
Unit
Arena rating, higher is better
Range
1,404 to 1,420
Sample
7224 votes
Configuration
GPT-5.6 Luna (xhigh)
Measured
25 Sep 2026
Not shown
Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
Reported by Arena (formerly LMArena)
1,491
Expert prompts · rank 22 of 359
Unit
Arena rating, higher is better
Range
1,481 to 1,501
Sample
4120 votes
Configuration
GPT-5.6 Luna (xhigh)
Measured
25 Sep 2026
Not shown
Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
Reported by Arena (formerly LMArena)
1,446
Instruction following · rank 48 of 409
Unit
Arena rating, higher is better
Range
1,439 to 1,452
Sample
12879 votes
Configuration
GPT-5.6 Luna (xhigh)
Measured
25 Sep 2026
Not shown
Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
Reported by Arena (formerly LMArena)
1,454
Overall · rank 53 of 409
Unit
Arena rating, higher is better
Range
1,449 to 1,458
Sample
35823 votes
Configuration
GPT-5.6 Luna (xhigh)
Measured
25 Sep 2026
Not shown
Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
Reported by Arena (formerly LMArena)
1,435
Writing, literature and language · rank 51 of 408
Unit
Arena rating, higher is better
Range
1,428 to 1,442
Sample
9607 votes
Configuration
GPT-5.6 Luna (xhigh)
Measured
25 Sep 2026
Not shown
Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
Reported by UGI Leaderboard
16.0%
Requested-length error · rank 127 of 370
Unit
% off the requested word count, lower is better
Configuration
gpt-5.6-luna
Measured
9 Jul 2026
Not shown
Not other format limits such as character counts or bullet counts.
Reported by UGI Leaderboard
19.0%
Requested-length error · rank 163 of 370
Unit
% off the requested word count, lower is better
Configuration
gpt-5.6-luna
Measured
9 Jul 2026
Not shown
Not other format limits such as character counts or bullet counts.
Reported by UGI Leaderboard
20.0%
Requested-length error · rank 179 of 370
Unit
% off the requested word count, lower is better
Configuration
gpt-5.6-luna
Measured
9 Jul 2026
Not shown
Not other format limits such as character counts or bullet counts.
Reported by UGI Leaderboard
17.0%
Requested-length error · rank 140 of 370
Unit
% off the requested word count, lower is better
Configuration
gpt-5.6-luna
Measured
9 Jul 2026
Not shown
Not other format limits such as character counts or bullet counts.
Reported by UGI Leaderboard
15.0%
Requested-length error · rank 119 of 370
Unit
% off the requested word count, lower is better
Configuration
GPT-5.6 Luna (xhigh)
Measured
9 Jul 2026
Not shown
Not other format limits such as character counts or bullet counts.
Reported by UGI Leaderboard
0.37
Style adherence · rank 84 of 370
Unit
score from 0 to 1, higher is better
Configuration
gpt-5.6-luna
Measured
9 Jul 2026
Not shown
Not brand voice on your own examples: UGI's prompts are private and lean towards creative writing.
Reported by UGI Leaderboard
0.37
Style adherence · rank 90 of 370
Unit
score from 0 to 1, higher is better
Configuration
gpt-5.6-luna
Measured
9 Jul 2026
Not shown
Not brand voice on your own examples: UGI's prompts are private and lean towards creative writing.
Reported by UGI Leaderboard
0.38
Style adherence · rank 65 of 370
Unit
score from 0 to 1, higher is better
Configuration
gpt-5.6-luna
Measured
9 Jul 2026
Not shown
Not brand voice on your own examples: UGI's prompts are private and lean towards creative writing.
Reported by UGI Leaderboard
0.36
Style adherence · rank 136 of 370
Unit
score from 0 to 1, higher is better
Configuration
gpt-5.6-luna
Measured
9 Jul 2026
Not shown
Not brand voice on your own examples: UGI's prompts are private and lean towards creative writing.
Reported by UGI Leaderboard
0.38
Style adherence · rank 58 of 370
Unit
score from 0 to 1, higher is better
Configuration
GPT-5.6 Luna (xhigh)
Measured
9 Jul 2026
Not shown
Not brand voice on your own examples: UGI's prompts are private and lean towards creative writing.
Reported by UGI Leaderboard
53.7
Writing score · rank 137 of 370
Unit
score out of 100, higher is better
Configuration
gpt-5.6-luna
Measured
9 Jul 2026
Not shown
Not business copy quality: UGI's prompts are private and lean towards creative writing, and models that often refuse get no score.
Reported by UGI Leaderboard
47.0
Writing score · rank 170 of 370
Unit
score out of 100, higher is better
Configuration
gpt-5.6-luna
Measured
9 Jul 2026
Not shown
Not business copy quality: UGI's prompts are private and lean towards creative writing, and models that often refuse get no score.
Reported by UGI Leaderboard
49.2
Writing score · rank 160 of 370
Unit
score out of 100, higher is better
Configuration
gpt-5.6-luna
Measured
9 Jul 2026
Not shown
Not business copy quality: UGI's prompts are private and lean towards creative writing, and models that often refuse get no score.
Reported by UGI Leaderboard
41.0
Writing score · rank 209 of 370
Unit
score out of 100, higher is better
Configuration
gpt-5.6-luna
Measured
9 Jul 2026
Not shown
Not business copy quality: UGI's prompts are private and lean towards creative writing, and models that often refuse get no score.
Reported by UGI Leaderboard
52.8
Writing score · rank 142 of 370
Unit
score out of 100, higher is better
Configuration
GPT-5.6 Luna (xhigh)
Measured
9 Jul 2026
Not shown
Not business copy quality: UGI's prompts are private and lean towards creative writing, and models that often refuse get no score.

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