Noometry

Model comparison

Grok 4.1 Fast vs Longcat Flash Chat

Grok 4.1 Fast and Longcat Flash Chat score almost the same on the Noometry Index (41.4 vs 42.1), so choose on price, context window or the category you care about most.

Last verified . 18 shared benchmarks.

Grok 4.1 Fast xAI

41.4

Rank #136 Confirmed

Longcat Flash Chat Meituan

42.1

Rank #120 Confirmed

Summary

  • They share 18 benchmarks with published results for both. Grok 4.1 Fast scores higher in 1 category and Longcat Flash Chat in 7 categories; 7 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 19.0.
  • The biggest single-benchmark swing is NYT Connections (extended): 87.4% for Grok 4.1 Fast and 17.7% for Longcat Flash Chat.
  • Longcat Flash Chat has downloadable open weights; the other is API-only.

Side by side

Grok 4.1 FastLongcat Flash Chat
ProviderxAIMeituan
Noometry Index41.442.1
Released2025-06-27—
WeightsProprietaryOpen
Context window128K—
Max output30K—
Input $ / M tokens$0.20—
Output $ / M tokens$0.50—
Results tracked3219

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Category by category

Coding Longcat Flash Chat leads

Grok 4.1 Fast: 34.1 (#245), Longcat Flash Chat: 43.5 (#87)

BenchmarkGrok 4.1 FastLongcat Flash Chat
LMArena Coding14111471
LMArena WebDev1242—
ALE-Bench394.93—

Agentic & Tool Use Not comparable

Grok 4.1 Fast: 36.3 (#39), Longcat Flash Chat: —

BenchmarkGrok 4.1 FastLongcat Flash Chat
Berkeley Function Calling Leaderboard69.6%—
τ²-bench Banking13.1%—
LMArena Search1171—
Vending-Bench 21,107—

Reasoning Grok 4.1 Fast leads

Grok 4.1 Fast: 43.4 (#49), Longcat Flash Chat: 19.0 (#272)

BenchmarkGrok 4.1 FastLongcat Flash Chat
NYT Connections (extended)87.4%17.7%
LMArena Hard Prompts14071440
SimpleBench56%—
Kagi LLM Benchmark—43.9%
DTBench87.7%—
ForecastBench61—

Math Longcat Flash Chat leads

Grok 4.1 Fast: 31.9 (#221), Longcat Flash Chat: 39.4 (#107)

BenchmarkGrok 4.1 FastLongcat Flash Chat
LMArena Math14081442
MathArena Final-Answer Competitions60.9%—
ProofBench4%—

Knowledge Longcat Flash Chat leads

Grok 4.1 Fast: 33.1 (#207), Longcat Flash Chat: 40.6 (#116)

BenchmarkGrok 4.1 FastLongcat Flash Chat
LMArena Expert13991454
Vectara Hallucination Rate17.8%—

Multimodal Not comparable

Grok 4.1 Fast: 37.0 (#76), Longcat Flash Chat: —

BenchmarkGrok 4.1 FastLongcat Flash Chat
LMArena Vision1201—

Multilingual Too close to call

Grok 4.1 Fast: 51.0 (#114), Longcat Flash Chat: 51.9 (#101)

BenchmarkGrok 4.1 FastLongcat Flash Chat
LMArena Non-English13911404
LMArena Chinese14411465
LMArena French14151456
LMArena German14041408
LMArena Japanese13491373
LMArena Korean13611371
LMArena Russian13871395
LMArena Spanish14131445

Instruction Following Longcat Flash Chat leads

Grok 4.1 Fast: 72.7 (#133), Longcat Flash Chat: 74.4 (#96)

BenchmarkGrok 4.1 FastLongcat Flash Chat
LMArena Instruction Following13761411

Long Context Longcat Flash Chat leads

Grok 4.1 Fast: 42.4 (#126), Longcat Flash Chat: 43.5 (#93)

BenchmarkGrok 4.1 FastLongcat Flash Chat
LMArena Longer Query13901425

Writing & Preference Longcat Flash Chat leads

Grok 4.1 Fast: 57.2 (#131), Longcat Flash Chat: 61.0 (#91)

BenchmarkGrok 4.1 FastLongcat Flash Chat
LMArena Text14081427
LMArena Creative Writing13941388
LMArena Multi-Turn13891418
EQ-Bench Creative Writing1327—

Frequently asked questions

Is Grok 4.1 Fast better than Longcat Flash Chat?

Grok 4.1 Fast and Longcat Flash Chat score almost the same on the Noometry Index (41.4 vs 42.1), so choose on price, context window or the category you care about most.

Is Grok 4.1 Fast or Longcat Flash Chat better for coding?

Longcat Flash Chat scores higher on coding benchmarks: 43.5 versus 34.1 in the Noometry coding category.

How many benchmarks do Grok 4.1 Fast and Longcat Flash Chat share?

18 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Longcat Flash Chat has 19.

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