Noometry

Model comparison

Claude Fable 5.1 vs Longcat Flash Chat

Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 42.1 on the Noometry Index.

Last verified . 18 shared benchmarks.

Claude Fable 5.1 Anthropic

69.0

Rank #2 Confirmed

Longcat Flash Chat Meituan

42.1

Rank #120 Confirmed

Summary

  • They share 18 benchmarks with published results for both. Claude Fable 5.1 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 Fable 5.1 leads 76.7 to 19.0.
  • The biggest single-benchmark swing is NYT Connections (extended): 90% for Claude Fable 5.1 and 17.7% for Longcat Flash Chat.
  • Longcat Flash Chat has downloadable open weights; the other is API-only.

Side by side

Claude Fable 5.1Longcat Flash Chat
ProviderAnthropicMeituan
Noometry Index69.042.1
Released2026-09-01—
WeightsProprietaryOpen
Context window1M—
Max output128K—
Input $ / M tokens$10—
Output $ / M tokens$50—
Results tracked5219

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding Claude Fable 5.1 leads

Claude Fable 5.1: 74.7 (#1), Longcat Flash Chat: 43.5 (#87)

BenchmarkClaude Fable 5.1Longcat Flash Chat
LMArena Coding15281471
FrontierCode50.9%—
CursorBench51.8%—
LMArena WebDev1744—
FrontierSWE56.3%—
SciCode63.1%—
GSO88.2%—
WeirdML92.9%—
MirrorCode73.3%—
ALE-Bench2,143—

Agentic & Tool Use Not comparable

Claude Fable 5.1: 50.7 (#5), Longcat Flash Chat: —

BenchmarkClaude Fable 5.1Longcat Flash Chat
APEX-Agents68.6%—
Remote Labor Index17.9%—
GDP.pdf29.6%—
Vending-Bench 25,422—

Reasoning Claude Fable 5.1 leads

Claude Fable 5.1: 76.7 (#7), Longcat Flash Chat: 19.0 (#272)

BenchmarkClaude Fable 5.1Longcat Flash Chat
NYT Connections (extended)90%17.7%
LMArena Hard Prompts15261440
ARC-AGI-290%—
Kagi LLM Benchmark—43.9%
ARC-AGI-197.5%—
CritPt31.1%—
Chess Puzzles47%—
EBR-Bench57.1%—
Mystery Game Puzzles58%—
DTBench97.6%—
LMCA65.5%—
Epoch Capabilities Index164.7—

Math Claude Fable 5.1 leads

Claude Fable 5.1: 89.6 (#4), Longcat Flash Chat: 39.4 (#107)

BenchmarkClaude Fable 5.1Longcat Flash Chat
LMArena Math15251442
FrontierMath (Tiers 1-3)90.2%—
FrontierMath Tier 487.8%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
FrontierMath Erdős0%—

Knowledge Claude Fable 5.1 leads

Claude Fable 5.1: 69.6 (#6), Longcat Flash Chat: 40.6 (#116)

BenchmarkClaude Fable 5.1Longcat Flash Chat
LMArena Expert15351454
Humanity's Last Exam46.5%—
SimpleQA Verified70.8%—

Multimodal Not comparable

Claude Fable 5.1: 53.9 (#4), Longcat Flash Chat: —

BenchmarkClaude Fable 5.1Longcat Flash Chat
LMArena Vision1318—
Blueprint-Bench 241.9%—
Furniture Assembly70%—
LMArena Document1513—

Multilingual Claude Fable 5.1 leads

Claude Fable 5.1: 59.1 (#3), Longcat Flash Chat: 51.9 (#101)

BenchmarkClaude Fable 5.1Longcat Flash Chat
LMArena Non-English15071404
LMArena Chinese15861465
LMArena French15251456
LMArena German15001408
LMArena Japanese15431373
LMArena Korean15341371
LMArena Russian15211395
LMArena Spanish15161445

Instruction Following Claude Fable 5.1 leads

Claude Fable 5.1: 79.2 (#6), Longcat Flash Chat: 74.4 (#96)

BenchmarkClaude Fable 5.1Longcat Flash Chat
LMArena Instruction Following15171411

Long Context Claude Fable 5.1 leads

Claude Fable 5.1: 46.7 (#20), Longcat Flash Chat: 43.5 (#93)

BenchmarkClaude Fable 5.1Longcat Flash Chat
LMArena Longer Query15221425

Writing & Preference Claude Fable 5.1 leads

Claude Fable 5.1: 79.2 (#2), Longcat Flash Chat: 61.0 (#91)

BenchmarkClaude Fable 5.1Longcat Flash Chat
LMArena Text15101427
LMArena Creative Writing15071388
LMArena Multi-Turn14921418
EQ-Bench Creative Writing2162—

Frequently asked questions

Is Claude Fable 5.1 better than Longcat Flash Chat?

Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 42.1 on the Noometry Index.

Is Claude Fable 5.1 or Longcat Flash Chat better for coding?

Claude Fable 5.1 scores higher on coding benchmarks: 74.7 versus 43.5 in the Noometry coding category.

How many benchmarks do Claude Fable 5.1 and Longcat Flash Chat share?

18 benchmarks have published results for both models. Claude Fable 5.1 has 52 scored results on Noometry and Longcat Flash Chat has 19.

Related comparisons

Go deeper