Noometry

Model comparison

GPT-6 Luna vs Longcat Flash Chat

GPT-6 Luna is the stronger model overall, scoring 53.3 to 42.1 on the Noometry Index.

Last verified . 18 shared benchmarks.

GPT-6 Luna OpenAI

53.3

Rank #36 Confirmed

Longcat Flash Chat Meituan

42.1

Rank #120 Confirmed

Summary

  • They share 18 benchmarks with published results for both. GPT-6 Luna scores higher in 4 categories and Longcat Flash Chat in 4 categories; 6 gaps are clear of the uncertainty.
  • The widest gap is in math, where GPT-6 Luna leads 76.1 to 39.4.
  • The biggest single-benchmark swing is NYT Connections (extended): 68.7% for GPT-6 Luna and 17.7% for Longcat Flash Chat.
  • Longcat Flash Chat has downloadable open weights; the other is API-only.

Side by side

GPT-6 LunaLongcat Flash Chat
ProviderOpenAIMeituan
Noometry Index53.342.1
Released2026-09-22—
WeightsProprietaryOpen
Context window1.05M—
Max output128K—
Input $ / M tokens$0.10—
Output $ / M tokens$0.50—
Results tracked4219

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Category by category

Coding GPT-6 Luna leads

GPT-6 Luna: 55.5 (#25), Longcat Flash Chat: 43.5 (#87)

BenchmarkGPT-6 LunaLongcat Flash Chat
LMArena Coding14391471
DeepSWE66.6%—
FrontierCode42.4%—
LMArena WebDev1581—
SciCode54.6%—
ALE-Bench1,577—

Agentic & Tool Use Not comparable

GPT-6 Luna: 33.3 (#54), Longcat Flash Chat: —

BenchmarkGPT-6 LunaLongcat Flash Chat
APEX-Agents44.3%—
GDP.pdf23%—

Reasoning GPT-6 Luna leads

GPT-6 Luna: 48.2 (#41), Longcat Flash Chat: 19.0 (#272)

BenchmarkGPT-6 LunaLongcat Flash Chat
NYT Connections (extended)68.7%17.7%
LMArena Hard Prompts14111440
ARC-AGI-259.3%—
Kagi LLM Benchmark—43.9%
ARC-AGI-186.7%—
CritPt19.4%—
Chess Puzzles31%—
Mystery Game Puzzles7%—
DTBench90.1%—
LMCA44.5%—
Epoch Capabilities Index156.28—

Math GPT-6 Luna leads

GPT-6 Luna: 76.1 (#15), Longcat Flash Chat: 39.4 (#107)

BenchmarkGPT-6 LunaLongcat Flash Chat
LMArena Math14161442
FrontierMath (Tiers 1-3)78.9%—
FrontierMath Tier 456.1%—
OTIS Mock AIME 2024-202598.9%—
ProofBench64%—

Knowledge GPT-6 Luna leads

GPT-6 Luna: 57.0 (#41), Longcat Flash Chat: 40.6 (#116)

BenchmarkGPT-6 LunaLongcat Flash Chat
LMArena Expert14441454
GPQA Diamond90.5%—
SimpleQA Verified41.4%—

Multimodal Not comparable

GPT-6 Luna: 42.4 (#30), Longcat Flash Chat: —

BenchmarkGPT-6 LunaLongcat Flash Chat
LMArena Vision1217—
Blueprint-Bench 231.2%—
Furniture Assembly44.2%—

Multilingual Longcat Flash Chat leads

GPT-6 Luna: 50.5 (#117), Longcat Flash Chat: 51.9 (#101)

BenchmarkGPT-6 LunaLongcat Flash Chat
LMArena Non-English13861404
LMArena Chinese14331465
LMArena French14201456
LMArena German13691408
LMArena Japanese13691373
LMArena Korean13601371
LMArena Russian13941395
LMArena Spanish13931445

Instruction Following Too close to call

GPT-6 Luna: 74.3 (#99), Longcat Flash Chat: 74.4 (#96)

BenchmarkGPT-6 LunaLongcat Flash Chat
LMArena Instruction Following14091411

Long Context Too close to call

GPT-6 Luna: 43.0 (#111), Longcat Flash Chat: 43.5 (#93)

BenchmarkGPT-6 LunaLongcat Flash Chat
LMArena Longer Query14091425

Writing & Preference Longcat Flash Chat leads

GPT-6 Luna: 58.3 (#119), Longcat Flash Chat: 61.0 (#91)

BenchmarkGPT-6 LunaLongcat Flash Chat
LMArena Text13911427
LMArena Creative Writing13631388
LMArena Multi-Turn13961418

Frequently asked questions

Is GPT-6 Luna better than Longcat Flash Chat?

GPT-6 Luna is the stronger model overall, scoring 53.3 to 42.1 on the Noometry Index.

Is GPT-6 Luna or Longcat Flash Chat better for coding?

GPT-6 Luna scores higher on coding benchmarks: 55.5 versus 43.5 in the Noometry coding category.

How many benchmarks do GPT-6 Luna and Longcat Flash Chat share?

18 benchmarks have published results for both models. GPT-6 Luna has 42 scored results on Noometry and Longcat Flash Chat has 19.

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