Noometry

Model comparison

Claude Sonnet 4.6 vs Longcat Flash Chat

Claude Sonnet 4.6 is the stronger model overall, scoring 50.3 to 42.1 on the Noometry Index.

Last verified . 18 shared benchmarks.

Claude Sonnet 4.6 Anthropic

50.3

Rank #50 Confirmed

Longcat Flash Chat Meituan

42.1

Rank #120 Confirmed

Summary

  • They share 18 benchmarks with published results for both. Claude Sonnet 4.6 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 Claude Sonnet 4.6 leads 46.1 to 19.0.
  • The biggest single-benchmark swing is NYT Connections (extended): 80.9% for Claude Sonnet 4.6 and 17.7% for Longcat Flash Chat.
  • Longcat Flash Chat has downloadable open weights; the other is API-only.

Side by side

Claude Sonnet 4.6Longcat Flash Chat
ProviderAnthropicMeituan
Noometry Index50.342.1
Released2026-02-17—
WeightsProprietaryOpen
Context window1M—
Max output128K—
Input $ / M tokens$3—
Output $ / M tokens$15—
Results tracked5719

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Category by category

Coding Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 46.3 (#67), Longcat Flash Chat: 43.5 (#87)

BenchmarkClaude Sonnet 4.6Longcat Flash Chat
LMArena Coding15041471
SWE-bench Verified75.2%—
DeepSWE29.9%—
FrontierCode24.3%—
LMArena WebDev1522—
SciCode46.8%—
WeirdML66.1%—
ALE-Bench1,327—

Agentic & Tool Use Not comparable

Claude Sonnet 4.6: 39.1 (#28), Longcat Flash Chat: —

BenchmarkClaude Sonnet 4.6Longcat Flash Chat
Terminal-Bench53.4%—
APEX-Agents43%—
OSWorld 2.09.3%—
DeepResearch Bench54.9%—
OSWorld72.1%—
ExploitBench23.6%—
GBAEval48.8%—
GDP.pdf18%—
LMArena Search1221—
Vending-Bench 27,204—

Reasoning Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 46.1 (#45), Longcat Flash Chat: 19.0 (#272)

BenchmarkClaude Sonnet 4.6Longcat Flash Chat
NYT Connections (extended)80.9%17.7%
LMArena Hard Prompts14841440
ARC-AGI-260.4%—
Kagi LLM Benchmark—43.9%
ARC-AGI-186.5%—
CritPt3.1%—
Chess Puzzles13%—
Thematic Generalization76.3%—
Mystery Game Puzzles16%—
DTBench89.9%—
LMCA46.5%—
Epoch Capabilities Index152.24—
ForecastBench62—

Math Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 52.9 (#49), Longcat Flash Chat: 39.4 (#107)

BenchmarkClaude Sonnet 4.6Longcat Flash Chat
LMArena Math14621442
OTIS Mock AIME 2024-202585.8%—
ProofBench45%—
FrontierMath (Feb 2025 set)32.4%—
FrontierMath Tier 4 (v1)8.3%—

Knowledge Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 51.7 (#65), Longcat Flash Chat: 40.6 (#116)

BenchmarkClaude Sonnet 4.6Longcat Flash Chat
LMArena Expert15001454
GPQA Diamond87.4%—
SimpleQA Verified35.5%—
Vectara Hallucination Rate10.6%—

Multimodal Not comparable

Claude Sonnet 4.6: 38.0 (#68), Longcat Flash Chat: —

BenchmarkClaude Sonnet 4.6Longcat Flash Chat
LMArena Vision1283—
Blueprint-Bench 26.7%—
LMArena Document1482—

Multilingual Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 54.4 (#41), Longcat Flash Chat: 51.9 (#101)

BenchmarkClaude Sonnet 4.6Longcat Flash Chat
LMArena Non-English14401404
LMArena Chinese14911465
LMArena French14651456
LMArena German14281408
LMArena Japanese14201373
LMArena Korean14111371
LMArena Russian14401395
LMArena Spanish14641445

Instruction Following Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 77.4 (#25), Longcat Flash Chat: 74.4 (#96)

BenchmarkClaude Sonnet 4.6Longcat Flash Chat
LMArena Instruction Following14751411

Long Context Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 45.3 (#44), Longcat Flash Chat: 43.5 (#93)

BenchmarkClaude Sonnet 4.6Longcat Flash Chat
LMArena Longer Query14791425

Writing & Preference Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 70.2 (#22), Longcat Flash Chat: 61.0 (#91)

BenchmarkClaude Sonnet 4.6Longcat Flash Chat
LMArena Text14581427
LMArena Creative Writing14351388
LMArena Multi-Turn14641418
EQ-Bench Creative Writing1810—
EQ-Bench 41207—

Frequently asked questions

Is Claude Sonnet 4.6 better than Longcat Flash Chat?

Claude Sonnet 4.6 is the stronger model overall, scoring 50.3 to 42.1 on the Noometry Index.

Is Claude Sonnet 4.6 or Longcat Flash Chat better for coding?

Claude Sonnet 4.6 scores higher on coding benchmarks: 46.3 versus 43.5 in the Noometry coding category.

How many benchmarks do Claude Sonnet 4.6 and Longcat Flash Chat share?

18 benchmarks have published results for both models. Claude Sonnet 4.6 has 57 scored results on Noometry and Longcat Flash Chat has 19.

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