Noometry

Model comparison

Grok 4.3 vs Longcat Flash Chat

Grok 4.3 is the stronger model overall, scoring 43.8 to 42.1 on the Noometry Index.

Last verified . 18 shared benchmarks.

Grok 4.3 xAI

43.8

Rank #86 Confirmed

Longcat Flash Chat Meituan

42.1

Rank #120 Confirmed

Summary

  • They share 18 benchmarks with published results for both. Grok 4.3 scores higher in 3 categories and Longcat Flash Chat in 5 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Grok 4.3 leads 35.9 to 19.0.
  • The biggest single-benchmark swing is NYT Connections (extended): 55.2% for Grok 4.3 and 17.7% for Longcat Flash Chat.
  • Longcat Flash Chat has downloadable open weights; the other is API-only.

Side by side

Grok 4.3Longcat Flash Chat
ProviderxAIMeituan
Noometry Index43.842.1
Released2026-04-17—
WeightsProprietaryOpen
Context window1M—
Max output30K—
Input $ / M tokens$1.25—
Output $ / M tokens$2.50—
Results tracked4019

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Category by category

Coding Longcat Flash Chat leads

Grok 4.3: 41.6 (#121), Longcat Flash Chat: 43.5 (#87)

BenchmarkGrok 4.3Longcat Flash Chat
LMArena Coding14151471
LMArena WebDev1357—
SciCode47.3%—
WeirdML49.9%—
ALE-Bench944.17—

Agentic & Tool Use Not comparable

Grok 4.3: 27.7 (#99), Longcat Flash Chat: —

BenchmarkGrok 4.3Longcat Flash Chat
GDP.pdf8%—
LMArena Search1165—
Vending-Bench 235.26—

Reasoning Grok 4.3 leads

Grok 4.3: 35.9 (#68), Longcat Flash Chat: 19.0 (#272)

BenchmarkGrok 4.3Longcat Flash Chat
NYT Connections (extended)55.2%17.7%
LMArena Hard Prompts13961440
Kagi LLM Benchmark—43.9%
CritPt8%—
Chess Puzzles25%—
DTBench90.7%—
LMCA38.3%—
Epoch Capabilities Index149.16—
ForecastBench60.3—

Math Grok 4.3 leads

Grok 4.3: 46.0 (#74), Longcat Flash Chat: 39.4 (#107)

BenchmarkGrok 4.3Longcat Flash Chat
LMArena Math13881442
FrontierMath (Tiers 1-3)42.8%—
FrontierMath Tier 414.6%—
OTIS Mock AIME 2024-202593.3%—
ProofBench11%—

Knowledge Grok 4.3 leads

Grok 4.3: 52.5 (#62), Longcat Flash Chat: 40.6 (#116)

BenchmarkGrok 4.3Longcat Flash Chat
LMArena Expert13851454
GPQA Diamond88.8%—
SimpleQA Verified33.2%—

Multimodal Not comparable

Grok 4.3: 31.6 (#104), Longcat Flash Chat: —

BenchmarkGrok 4.3Longcat Flash Chat
LMArena Vision1229—
Blueprint-Bench 20%—

Multilingual Longcat Flash Chat leads

Grok 4.3: 50.5 (#120), Longcat Flash Chat: 51.9 (#101)

BenchmarkGrok 4.3Longcat Flash Chat
LMArena Non-English13851404
LMArena Chinese14221465
LMArena French14121456
LMArena German13951408
LMArena Japanese13791373
LMArena Korean13561371
LMArena Russian13991395
LMArena Spanish13981445

Instruction Following Longcat Flash Chat leads

Grok 4.3: 72.1 (#140), Longcat Flash Chat: 74.4 (#96)

BenchmarkGrok 4.3Longcat Flash Chat
LMArena Instruction Following13661411

Long Context Longcat Flash Chat leads

Grok 4.3: 42.5 (#123), Longcat Flash Chat: 43.5 (#93)

BenchmarkGrok 4.3Longcat Flash Chat
LMArena Longer Query13931425

Writing & Preference Longcat Flash Chat leads

Grok 4.3: 58.5 (#118), Longcat Flash Chat: 61.0 (#91)

BenchmarkGrok 4.3Longcat Flash Chat
LMArena Text13971427
LMArena Creative Writing13801388
LMArena Multi-Turn14061418
EQ-Bench 41075—

Frequently asked questions

Is Grok 4.3 better than Longcat Flash Chat?

Grok 4.3 is the stronger model overall, scoring 43.8 to 42.1 on the Noometry Index.

Is Grok 4.3 or Longcat Flash Chat better for coding?

Longcat Flash Chat scores higher on coding benchmarks: 43.5 versus 41.6 in the Noometry coding category.

How many benchmarks do Grok 4.3 and Longcat Flash Chat share?

18 benchmarks have published results for both models. Grok 4.3 has 40 scored results on Noometry and Longcat Flash Chat has 19.

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