Noometry

Model comparison

GPT-5.2 Pro vs GPT-6 Luna

GPT-6 Luna is the stronger model overall, scoring 53.3 to 52.3 on the Noometry Index.

Last verified . 6 shared benchmarks.

GPT-5.2 Pro OpenAI

52.3

Rank #39 Reported

GPT-6 Luna OpenAI

53.3

Rank #36 Confirmed

Summary

  • They share 6 benchmarks with published results for both. GPT-5.2 Pro scores higher in 1 category and GPT-6 Luna in 1 category; 2 gaps are clear of the uncertainty.
  • The widest gap is in math, where GPT-6 Luna leads 76.1 to 65.3.
  • The biggest single-benchmark swing is NYT Connections (extended): 79.3% for GPT-5.2 Pro and 68.7% for GPT-6 Luna.
  • GPT-6 Luna is cheaper at $0.10 / $0.50 per million input/output tokens, against $21 / $168 for GPT-5.2 Pro.
  • GPT-6 Luna accepts more context: 1.05M tokens versus 400K.

Side by side

GPT-5.2 ProGPT-6 Luna
ProviderOpenAIOpenAI
Noometry Index52.353.3
Released2025-12-112026-09-22
WeightsProprietaryProprietary
Context window400K1.05M
Max output128K128K
Input $ / M tokens$21$0.10
Output $ / M tokens$168$0.50
Results tracked842

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding Not comparable

GPT-5.2 Pro: —, GPT-6 Luna: 55.5 (#25)

BenchmarkGPT-5.2 ProGPT-6 Luna
DeepSWE—66.6%
FrontierCode—42.4%
LMArena WebDev—1581
SciCode—54.6%
LMArena Coding—1439
ALE-Bench—1,577

Agentic & Tool Use Not comparable

GPT-5.2 Pro: —, GPT-6 Luna: 33.3 (#54)

BenchmarkGPT-5.2 ProGPT-6 Luna
APEX-Agents—44.3%
GDP.pdf—23%

Reasoning GPT-5.2 Pro leads

GPT-5.2 Pro: 51.5 (#33), GPT-6 Luna: 48.2 (#41)

BenchmarkGPT-5.2 ProGPT-6 Luna
ARC-AGI-254.2%59.3%
NYT Connections (extended)79.3%68.7%
ARC-AGI-190.5%86.7%
Epoch Capabilities Index155.4156.28
SimpleBench57.4%—
CritPt—19.4%
Chess Puzzles—31%
LMArena Hard Prompts—1411
Mystery Game Puzzles—7%
DTBench—90.1%
LMCA—44.5%

Math GPT-6 Luna leads

GPT-5.2 Pro: 65.3 (#29), GPT-6 Luna: 76.1 (#15)

BenchmarkGPT-5.2 ProGPT-6 Luna
FrontierMath (Tiers 1-3)74%78.9%
FrontierMath Tier 446%56.1%
OTIS Mock AIME 2024-2025—98.9%
ProofBench—64%
LMArena Math—1416
FrontierMath Tier 4 (v1)31.3%—

Knowledge Not comparable

GPT-5.2 Pro: —, GPT-6 Luna: 57.0 (#41)

BenchmarkGPT-5.2 ProGPT-6 Luna
GPQA Diamond—90.5%
SimpleQA Verified—41.4%
LMArena Expert—1444

Multimodal Not comparable

GPT-5.2 Pro: —, GPT-6 Luna: 42.4 (#30)

BenchmarkGPT-5.2 ProGPT-6 Luna
LMArena Vision—1217
Blueprint-Bench 2—31.2%
Furniture Assembly—44.2%

Multilingual Not comparable

GPT-5.2 Pro: —, GPT-6 Luna: 50.5 (#117)

BenchmarkGPT-5.2 ProGPT-6 Luna
LMArena Non-English—1386
LMArena Chinese—1433
LMArena French—1420
LMArena German—1369
LMArena Japanese—1369
LMArena Korean—1360
LMArena Russian—1394
LMArena Spanish—1393

Instruction Following Not comparable

GPT-5.2 Pro: —, GPT-6 Luna: 74.3 (#99)

BenchmarkGPT-5.2 ProGPT-6 Luna
LMArena Instruction Following—1409

Long Context Not comparable

GPT-5.2 Pro: —, GPT-6 Luna: 43.0 (#111)

BenchmarkGPT-5.2 ProGPT-6 Luna
LMArena Longer Query—1409

Writing & Preference Not comparable

GPT-5.2 Pro: —, GPT-6 Luna: 58.3 (#119)

BenchmarkGPT-5.2 ProGPT-6 Luna
LMArena Text—1391
LMArena Creative Writing—1363
LMArena Multi-Turn—1396

Frequently asked questions

Is GPT-5.2 Pro better than GPT-6 Luna?

GPT-6 Luna is the stronger model overall, scoring 53.3 to 52.3 on the Noometry Index.

Which is cheaper, GPT-5.2 Pro or GPT-6 Luna?

GPT-6 Luna is cheaper. It lists at $0.10 per million input tokens and $0.50 per million output tokens; GPT-5.2 Pro lists at $21 and $168.

Which has the bigger context window?

GPT-6 Luna does, with 1.05M tokens against 400K.

How many benchmarks do GPT-5.2 Pro and GPT-6 Luna share?

6 benchmarks have published results for both models. GPT-5.2 Pro has 8 scored results on Noometry and GPT-6 Luna has 42.

Related comparisons

Go deeper