Noometry

Model comparison

Kimi K2.5 vs Longcat Flash Chat

Kimi K2.5 is the stronger model overall, scoring 47.8 to 41.5 on the Noometry Index.

Last verified . 19 shared benchmarks.

Kimi K2.5 Moonshot AI

47.8

Rank #50 Confirmed

Longcat Flash Chat Meituan

41.5

Rank #121 Confirmed

Summary

  • They share 19 benchmarks with published results for both. Kimi K2.5 scores higher in 8 categories and Longcat Flash Chat in 0 categories; 7 gaps are clear of the uncertainty.
  • The widest gap is in math, where Kimi K2.5 leads 50.3 to 36.6.
  • The biggest single-benchmark swing is NYT Connections (extended): 69.9% for Kimi K2.5 and 17.7% for Longcat Flash Chat.

Side by side

Kimi K2.5Longcat Flash Chat
ProviderMoonshot AIMeituan
Noometry Index47.841.5
Released2026-01-27—
WeightsOpenOpen
Context window262K—
Max output262K—
Input $ / M tokens$0.45—
Output $ / M tokens$2.25—
Results tracked5119

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

Category by category

Coding Kimi K2.5 leads

Kimi K2.5: 48.7 (#48), Longcat Flash Chat: 42.9 (#85)

BenchmarkKimi K2.5Longcat Flash Chat
LMArena Coding14741471
SWE-bench Verified73.8%—
SWE-bench Verified (bash only)70.8%—
LMArena WebDev1436—
SWE-bench Multilingual67.3%—
SciCode49%—
WeirdML45.6%—
ALE-Bench821.65—

Agentic & Tool Use Not comparable

Kimi K2.5: 34.0 (#44), Longcat Flash Chat: —

BenchmarkKimi K2.5Longcat Flash Chat
Terminal-Bench43.2%—
OSWorld63.3%—
Vending-Bench 21,198—

Reasoning Kimi K2.5 leads

Kimi K2.5: 31.2 (#74), Longcat Flash Chat: 18.3 (#267)

BenchmarkKimi K2.5Longcat Flash Chat
Kagi LLM Benchmark78.5%43.9%
NYT Connections (extended)69.9%17.7%
LMArena Hard Prompts14541440
ARC-AGI-211.8%—
SimpleBench46.8%—
ARC-AGI-165.3%—
CritPt3.1%—
Chess Puzzles12%—
EnigmaEval3.4%—
Thematic Generalization69.4%—
Epoch Capabilities Index148.05—

Math Kimi K2.5 leads

Kimi K2.5: 50.3 (#46), Longcat Flash Chat: 36.6 (#107)

BenchmarkKimi K2.5Longcat Flash Chat
LMArena Math14701441
MathArena Final-Answer Competitions62.3%—
OTIS Mock AIME 2024-202592.2%—
FrontierMath (Feb 2025 set)27.9%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Kimi K2.5 leads

Kimi K2.5: 53.6 (#52), Longcat Flash Chat: 40.0 (#111)

BenchmarkKimi K2.5Longcat Flash Chat
LMArena Expert14661454
GPQA Diamond87.6%—
Humanity's Last Exam24.4%—
SimpleQA Verified34.3%—
Vectara Hallucination Rate14.2%—

Multimodal Not comparable

Kimi K2.5: 40.4 (#37), Longcat Flash Chat: —

BenchmarkKimi K2.5Longcat Flash Chat
LMArena Vision1269—
LMArena Document1430—

Multilingual Kimi K2.5 leads

Kimi K2.5: 54.1 (#50), Longcat Flash Chat: 52.1 (#95)

BenchmarkKimi K2.5Longcat Flash Chat
LMArena Non-English14331404
LMArena Chinese14951465
LMArena French14541457
LMArena German14411409
LMArena Japanese14221373
LMArena Korean14121372
LMArena Russian14361396
LMArena Spanish14501445

Instruction Following Too close to call

Kimi K2.5: 75.5 (#60), Longcat Flash Chat: 74.6 (#92)

BenchmarkKimi K2.5Longcat Flash Chat
LMArena Instruction Following14311411

Long Context Kimi K2.5 leads

Kimi K2.5: 52.1 (#7), Longcat Flash Chat: 43.5 (#89)

BenchmarkKimi K2.5Longcat Flash Chat
LMArena Longer Query14451425
Fiction.LiveBench86.1%—
CL-bench19.3%—
CL-bench Life13.2%—

Writing & Preference Kimi K2.5 leads

Kimi K2.5: 65.3 (#51), Longcat Flash Chat: 61.2 (#88)

BenchmarkKimi K2.5Longcat Flash Chat
LMArena Text14451427
LMArena Creative Writing14231388
LMArena Multi-Turn14441418
EQ-Bench Creative Writing1579—

Frequently asked questions

Is Kimi K2.5 better than Longcat Flash Chat?

Kimi K2.5 is the stronger model overall, scoring 47.8 to 41.5 on the Noometry Index.

Is Kimi K2.5 or Longcat Flash Chat better for coding?

Kimi K2.5 scores higher on coding benchmarks: 48.7 versus 42.9 in the Noometry coding category.

How many benchmarks do Kimi K2.5 and Longcat Flash Chat share?

19 benchmarks have published results for both models. Kimi K2.5 has 51 scored results on Noometry and Longcat Flash Chat has 19.

Related comparisons

Go deeper