Noometry

Model comparison

Claude Opus 4.8 vs Longcat Flash Chat

Claude Opus 4.8 is the stronger model overall, scoring 60.7 to 42.1 on the Noometry Index.

Last verified . 19 shared benchmarks.

Claude Opus 4.8 Anthropic

60.7

Rank #13 Confirmed

Longcat Flash Chat Meituan

42.1

Rank #120 Confirmed

Summary

  • They share 19 benchmarks with published results for both. Claude Opus 4.8 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 Opus 4.8 leads 64.7 to 19.0.
  • The biggest single-benchmark swing is NYT Connections (extended): 91.1% for Claude Opus 4.8 and 17.7% for Longcat Flash Chat.
  • Longcat Flash Chat has downloadable open weights; the other is API-only.

Side by side

Claude Opus 4.8Longcat Flash Chat
ProviderAnthropicMeituan
Noometry Index60.742.1
Released2026-05-28—
WeightsProprietaryOpen
Context window1M—
Max output128K—
Input $ / M tokens$5—
Output $ / M tokens$25—
Results tracked6519

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Category by category

Coding Claude Opus 4.8 leads

Claude Opus 4.8: 59.9 (#12), Longcat Flash Chat: 43.5 (#87)

BenchmarkClaude Opus 4.8Longcat Flash Chat
LMArena Coding14901471
DeepSWE59%—
FrontierCode46.5%—
LMArena WebDev1556—
SciCode53.5%—
GSO47.1%—
WeirdML82.9%—
ALE-Bench1,564—

Agentic & Tool Use Not comparable

Claude Opus 4.8: 47.6 (#11), Longcat Flash Chat: —

BenchmarkClaude Opus 4.8Longcat Flash Chat
APEX-Agents48.9%—
OSWorld 2.020.6%—
Remote Labor Index8.3%—
τ²-bench Banking39.7%—
DeepResearch Bench50.2%—
PostTrainBench33.8%—
GBAEval70.9%—
GDP.pdf24%—
LMArena Search1204—
Vending-Bench 25,787—

Reasoning Claude Opus 4.8 leads

Claude Opus 4.8: 64.7 (#16), Longcat Flash Chat: 19.0 (#272)

BenchmarkClaude Opus 4.8Longcat Flash Chat
Kagi LLM Benchmark88.8%43.9%
NYT Connections (extended)91.1%17.7%
LMArena Hard Prompts14821440
ARC-AGI-272.1%—
SimpleBench64.8%—
ARC-AGI-192.5%—
CritPt20.9%—
Chess Puzzles34%—
EnigmaEval23.5%—
EBR-Bench28.6%—
Mystery Game Puzzles36%—
DTBench94.9%—
LMCA57.5%—
Surface Evolver Bench87.5%—
Bench to the Future 30.14—
Epoch Capabilities Index158.21—
ForecastBench59.9—

Math Claude Opus 4.8 leads

Claude Opus 4.8: 78.4 (#13), Longcat Flash Chat: 39.4 (#107)

BenchmarkClaude Opus 4.8Longcat Flash Chat
LMArena Math14871442
FrontierMath (Tiers 1-3)80%—
FrontierMath Tier 456.1%—
MathArena Final-Answer Competitions91.8%—
OTIS Mock AIME 2024-202598.3%—
ProofBench69%—
FrontierMath (Feb 2025 set)47.2%—
FrontierMath Tier 4 (v1)31.3%—

Knowledge Claude Opus 4.8 leads

Claude Opus 4.8: 61.3 (#29), Longcat Flash Chat: 40.6 (#116)

BenchmarkClaude Opus 4.8Longcat Flash Chat
LMArena Expert15021454
GPQA Diamond91%—
SimpleQA Verified53%—

Multimodal Not comparable

Claude Opus 4.8: 42.9 (#26), Longcat Flash Chat: —

BenchmarkClaude Opus 4.8Longcat Flash Chat
LMArena Vision1294—
Blueprint-Bench 214.5%—
Furniture Assembly42.5%—
LMArena Document1475—

Multilingual Claude Opus 4.8 leads

Claude Opus 4.8: 55.2 (#33), Longcat Flash Chat: 51.9 (#101)

BenchmarkClaude Opus 4.8Longcat Flash Chat
LMArena Non-English14501404
LMArena Chinese15071465
LMArena French14811456
LMArena German14721408
LMArena Japanese14401373
LMArena Korean14321371
LMArena Russian14741395
LMArena Spanish14661445

Instruction Following Claude Opus 4.8 leads

Claude Opus 4.8: 77.4 (#24), Longcat Flash Chat: 74.4 (#96)

BenchmarkClaude Opus 4.8Longcat Flash Chat
LMArena Instruction Following14761411

Long Context Claude Opus 4.8 leads

Claude Opus 4.8: 45.4 (#35), Longcat Flash Chat: 43.5 (#93)

BenchmarkClaude Opus 4.8Longcat Flash Chat
LMArena Longer Query14831425

Writing & Preference Claude Opus 4.8 leads

Claude Opus 4.8: 72.0 (#16), Longcat Flash Chat: 61.0 (#91)

BenchmarkClaude Opus 4.8Longcat Flash Chat
LMArena Text14611427
LMArena Creative Writing14541388
LMArena Multi-Turn14761418
EQ-Bench Creative Writing1840—
EQ-Bench 41281—

Frequently asked questions

Is Claude Opus 4.8 better than Longcat Flash Chat?

Claude Opus 4.8 is the stronger model overall, scoring 60.7 to 42.1 on the Noometry Index.

Is Claude Opus 4.8 or Longcat Flash Chat better for coding?

Claude Opus 4.8 scores higher on coding benchmarks: 59.9 versus 43.5 in the Noometry coding category.

How many benchmarks do Claude Opus 4.8 and Longcat Flash Chat share?

19 benchmarks have published results for both models. Claude Opus 4.8 has 65 scored results on Noometry and Longcat Flash Chat has 19.

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