Noometry

Model comparison

Grok 4.5 vs Longcat Flash Chat

Grok 4.5 is the stronger model overall, scoring 55.0 to 42.1 on the Noometry Index.

Last verified . 19 shared benchmarks.

Grok 4.5 xAI

55.0

Rank #25 Confirmed

Longcat Flash Chat Meituan

42.1

Rank #120 Confirmed

Summary

  • They share 19 benchmarks with published results for both. Grok 4.5 scores higher in 8 categories and Longcat Flash Chat in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Grok 4.5 leads 56.1 to 19.0.
  • The biggest single-benchmark swing is NYT Connections (extended): 79.9% for Grok 4.5 and 17.7% for Longcat Flash Chat.
  • Longcat Flash Chat has downloadable open weights; the other is API-only.

Side by side

Grok 4.5Longcat Flash Chat
ProviderxAIMeituan
Noometry Index55.042.1
Released2026-07-08—
WeightsProprietaryOpen
Context window500K—
Max output500K—
Input $ / M tokens$2—
Output $ / M tokens$6—
Results tracked5219

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Category by category

Coding Grok 4.5 leads

Grok 4.5: 52.2 (#35), Longcat Flash Chat: 43.5 (#87)

BenchmarkGrok 4.5Longcat Flash Chat
LMArena Coding14741471
DeepSWE53.8%—
FrontierCode42.4%—
LMArena WebDev1553—
SciCode54.1%—
WeirdML46.4%—
ALE-Bench1,309—

Agentic & Tool Use Not comparable

Grok 4.5: 44.4 (#17), Longcat Flash Chat: —

BenchmarkGrok 4.5Longcat Flash Chat
APEX-Agents56.2%—
τ²-bench Banking47.9%—
PostTrainBench23.4%—
GBAEval65.4%—
GDP.pdf14%—
LMArena Search1213—
Vending-Bench 23,887—

Reasoning Grok 4.5 leads

Grok 4.5: 56.1 (#25), Longcat Flash Chat: 19.0 (#272)

BenchmarkGrok 4.5Longcat Flash Chat
Kagi LLM Benchmark83.5%43.9%
NYT Connections (extended)79.9%17.7%
LMArena Hard Prompts14621440
ARC-AGI-252.6%—
SimpleBench70%—
ARC-AGI-187.2%—
CritPt15.4%—
Chess Puzzles36%—
DTBench96.5%—
LMCA45.2%—
Surface Evolver Bench74.4%—
Epoch Capabilities Index153.92—

Math Grok 4.5 leads

Grok 4.5: 60.9 (#35), Longcat Flash Chat: 39.4 (#107)

BenchmarkGrok 4.5Longcat Flash Chat
LMArena Math14591442
FrontierMath (Tiers 1-3)57.2%—
FrontierMath Tier 424.4%—
OTIS Mock AIME 2024-202597.8%—
ProofBench31%—

Knowledge Grok 4.5 leads

Grok 4.5: 62.3 (#24), Longcat Flash Chat: 40.6 (#116)

BenchmarkGrok 4.5Longcat Flash Chat
LMArena Expert14661454
GPQA Diamond93.4%—
SimpleQA Verified48.3%—

Multimodal Not comparable

Grok 4.5: 37.6 (#72), Longcat Flash Chat: —

BenchmarkGrok 4.5Longcat Flash Chat
LMArena Vision1288—
Blueprint-Bench 227.3%—
Furniture Assembly22.5%—
LMArena Document1452—

Multilingual Grok 4.5 leads

Grok 4.5: 54.4 (#42), Longcat Flash Chat: 51.9 (#101)

BenchmarkGrok 4.5Longcat Flash Chat
LMArena Non-English14401404
LMArena Chinese14961465
LMArena French14561456
LMArena German14461408
LMArena Japanese14281373
LMArena Korean14041371
LMArena Russian14481395
LMArena Spanish14501445

Instruction Following Grok 4.5 leads

Grok 4.5: 76.0 (#48), Longcat Flash Chat: 74.4 (#96)

BenchmarkGrok 4.5Longcat Flash Chat
LMArena Instruction Following14461411

Long Context Grok 4.5 leads

Grok 4.5: 44.8 (#56), Longcat Flash Chat: 43.5 (#93)

BenchmarkGrok 4.5Longcat Flash Chat
LMArena Longer Query14631425

Writing & Preference Grok 4.5 leads

Grok 4.5: 65.8 (#42), Longcat Flash Chat: 61.0 (#91)

BenchmarkGrok 4.5Longcat Flash Chat
LMArena Text14481427
LMArena Creative Writing14421388
LMArena Multi-Turn14561418
EQ-Bench Creative Writing1579—

Frequently asked questions

Is Grok 4.5 better than Longcat Flash Chat?

Grok 4.5 is the stronger model overall, scoring 55.0 to 42.1 on the Noometry Index.

Is Grok 4.5 or Longcat Flash Chat better for coding?

Grok 4.5 scores higher on coding benchmarks: 52.2 versus 43.5 in the Noometry coding category.

How many benchmarks do Grok 4.5 and Longcat Flash Chat share?

19 benchmarks have published results for both models. Grok 4.5 has 52 scored results on Noometry and Longcat Flash Chat has 19.

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