Noometry

Model comparison

GPT-5.2 Pro vs GPT-5.6 Luna

GPT-5.6 Luna is the stronger model overall, scoring 54.6 to 52.3 on the Noometry Index.

Last verified . 7 shared benchmarks.

GPT-5.2 Pro OpenAI

52.3

Rank #39 Reported

GPT-5.6 Luna OpenAI

54.6

Rank #30 Confirmed

Summary

  • They share 7 benchmarks with published results for both. GPT-5.2 Pro scores higher in 1 category and GPT-5.6 Luna in 1 category; 2 gaps are clear of the uncertainty.
  • The widest gap is in math, where GPT-5.6 Luna leads 77.7 to 65.3.
  • The biggest single-benchmark swing is FrontierMath Tier 4: 46% for GPT-5.2 Pro and 61% for GPT-5.6 Luna.
  • GPT-5.6 Luna is cheaper at $0.20 / $1.20 per million input/output tokens, against $21 / $168 for GPT-5.2 Pro.
  • GPT-5.6 Luna accepts more context: 1.05M tokens versus 400K.

Side by side

GPT-5.2 ProGPT-5.6 Luna
ProviderOpenAIOpenAI
Noometry Index52.354.6
Released2025-12-112026-07-09
WeightsProprietaryProprietary
Context window400K1.05M
Max output128K128K
Input $ / M tokens$21$0.20
Output $ / M tokens$168$1.20
Results tracked852

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Category by category

Coding Not comparable

GPT-5.2 Pro: —, GPT-5.6 Luna: 54.5 (#28)

BenchmarkGPT-5.2 ProGPT-5.6 Luna
DeepSWE—67.2%
FrontierCode—39.8%
CursorBench—35.9%
LMArena WebDev—1519
SciCode—53.6%
WeirdML—60.9%
LMArena Coding—1466
ALE-Bench—1,667

Agentic & Tool Use Not comparable

GPT-5.2 Pro: —, GPT-5.6 Luna: 34.4 (#45)

BenchmarkGPT-5.2 ProGPT-5.6 Luna
APEX-Agents—43%
BALROG—45.6%
GDP.pdf—22.7%
Vending-Bench 2—4,095

Reasoning GPT-5.2 Pro leads

GPT-5.2 Pro: 51.5 (#33), GPT-5.6 Luna: 47.6 (#43)

BenchmarkGPT-5.2 ProGPT-5.6 Luna
ARC-AGI-254.2%59.5%
SimpleBench57.4%46.8%
NYT Connections (extended)79.3%69.4%
ARC-AGI-190.5%88%
Epoch Capabilities Index155.4156.39
Kagi LLM Benchmark—49.1%
CritPt—20.6%
Chess Puzzles—40%
LMArena Hard Prompts—1451
Mystery Game Puzzles—21%
DTBench—89.1%
LMCA—48.5%
Surface Evolver Bench—61.9%

Math GPT-5.6 Luna leads

GPT-5.2 Pro: 65.3 (#29), GPT-5.6 Luna: 77.7 (#14)

BenchmarkGPT-5.2 ProGPT-5.6 Luna
FrontierMath (Tiers 1-3)74%82.1%
FrontierMath Tier 446%61%
OTIS Mock AIME 2024-2025—98.3%
ProofBench—60%
LMArena Math—1458
FrontierMath Tier 4 (v1)31.3%—

Knowledge Not comparable

GPT-5.2 Pro: —, GPT-5.6 Luna: 58.5 (#34)

BenchmarkGPT-5.2 ProGPT-5.6 Luna
GPQA Diamond—91.6%
SimpleQA Verified—41%
LMArena Expert—1478

Multimodal Not comparable

GPT-5.2 Pro: —, GPT-5.6 Luna: 42.7 (#28)

BenchmarkGPT-5.2 ProGPT-5.6 Luna
LMArena Vision—1258
Blueprint-Bench 2—22.6%
Furniture Assembly—42.5%
LMArena Document—1457

Multilingual Not comparable

GPT-5.2 Pro: —, GPT-5.6 Luna: 52.8 (#78)

BenchmarkGPT-5.2 ProGPT-5.6 Luna
LMArena Non-English—1417
LMArena Chinese—1470
LMArena French—1456
LMArena German—1454
LMArena Japanese—1411
LMArena Korean—1415
LMArena Russian—1428
LMArena Spanish—1448

Instruction Following Not comparable

GPT-5.2 Pro: —, GPT-5.6 Luna: 75.6 (#57)

BenchmarkGPT-5.2 ProGPT-5.6 Luna
LMArena Instruction Following—1437

Long Context Not comparable

GPT-5.2 Pro: —, GPT-5.6 Luna: 43.9 (#82)

BenchmarkGPT-5.2 ProGPT-5.6 Luna
LMArena Longer Query—1436

Writing & Preference Not comparable

GPT-5.2 Pro: —, GPT-5.6 Luna: 68.0 (#29)

BenchmarkGPT-5.2 ProGPT-5.6 Luna
LMArena Text—1431
LMArena Creative Writing—1396
EQ-Bench Creative Writing—1829
EQ-Bench 4—1156
LMArena Multi-Turn—1434

Frequently asked questions

Is GPT-5.2 Pro better than GPT-5.6 Luna?

GPT-5.6 Luna is the stronger model overall, scoring 54.6 to 52.3 on the Noometry Index.

Which is cheaper, GPT-5.2 Pro or GPT-5.6 Luna?

GPT-5.6 Luna is cheaper. It lists at $0.20 per million input tokens and $1.20 per million output tokens; GPT-5.2 Pro lists at $21 and $168.

Which has the bigger context window?

GPT-5.6 Luna does, with 1.05M tokens against 400K.

How many benchmarks do GPT-5.2 Pro and GPT-5.6 Luna share?

7 benchmarks have published results for both models. GPT-5.2 Pro has 8 scored results on Noometry and GPT-5.6 Luna has 52.

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