Noometry

Model comparison

Grok 4.1 vs Kimi K2.5

Kimi K2.5 is the stronger model overall, scoring 47.8 to 40.8 on the Noometry Index.

Last verified . 18 shared benchmarks.

Grok 4.1 xAI

40.8

Rank #135 Confirmed

Kimi K2.5 Moonshot AI

47.8

Rank #50 Confirmed

Summary

  • They share 18 benchmarks with published results for both. Grok 4.1 scores higher in 0 categories and Kimi K2.5 in 9 categories; 7 gaps are clear of the uncertainty.
  • The widest gap is in coding, where Kimi K2.5 leads 48.7 to 33.4.
  • Kimi K2.5 has downloadable open weights; the other is API-only.

Side by side

Grok 4.1Kimi K2.5
ProviderxAIMoonshot AI
Noometry Index40.847.8
Released2025-11-172026-01-27
WeightsProprietaryOpen
Context window—262K
Max output—262K
Input $ / M tokens—$0.45
Output $ / M tokens—$2.25
Results tracked1951

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Category by category

Coding Kimi K2.5 leads

Grok 4.1: 33.4 (#246), Kimi K2.5: 48.7 (#48)

BenchmarkGrok 4.1Kimi K2.5
LMArena WebDev12141436
LMArena Coding14451474
SWE-bench Verified—73.8%
SWE-bench Verified (bash only)—70.8%
SWE-bench Multilingual—67.3%
SciCode—49%
WeirdML—45.6%
ALE-Bench—821.65

Agentic & Tool Use Too close to call

Grok 4.1: 33.8 (#47), Kimi K2.5: 34.0 (#44)

BenchmarkGrok 4.1Kimi K2.5
Terminal-Bench—43.2%
Cybench39%—
OSWorld—63.3%
Vending-Bench 2—1,198

Reasoning Kimi K2.5 leads

Grok 4.1: 28.3 (#91), Kimi K2.5: 31.2 (#74)

BenchmarkGrok 4.1Kimi K2.5
LMArena Hard Prompts14361454
ARC-AGI-2—11.8%
SimpleBench—46.8%
Kagi LLM Benchmark—78.5%
NYT Connections (extended)—69.9%
ARC-AGI-1—65.3%
CritPt—3.1%
Chess Puzzles—12%
EnigmaEval—3.4%
Thematic Generalization—69.4%
Epoch Capabilities Index—148.05

Math Kimi K2.5 leads

Grok 4.1: 36.2 (#124), Kimi K2.5: 50.3 (#46)

BenchmarkGrok 4.1Kimi K2.5
LMArena Math14221470
MathArena Final-Answer Competitions—62.3%
OTIS Mock AIME 2024-2025—92.2%
FrontierMath (Feb 2025 set)—27.9%
FrontierMath Tier 4 (v1)—4.2%

Knowledge Kimi K2.5 leads

Grok 4.1: 38.9 (#129), Kimi K2.5: 53.6 (#52)

BenchmarkGrok 4.1Kimi K2.5
LMArena Expert14171466
GPQA Diamond—87.6%
Humanity's Last Exam—24.4%
SimpleQA Verified—34.3%
Vectara Hallucination Rate—14.2%

Multimodal Not comparable

Grok 4.1: —, Kimi K2.5: 40.4 (#37)

BenchmarkGrok 4.1Kimi K2.5
LMArena Vision—1269
LMArena Document—1430

Multilingual Too close to call

Grok 4.1: 53.6 (#64), Kimi K2.5: 54.1 (#50)

BenchmarkGrok 4.1Kimi K2.5
LMArena Non-English14251433
LMArena Chinese14641495
LMArena French14481454
LMArena German14471441
LMArena Japanese13961422
LMArena Korean14071412
LMArena Russian14341436
LMArena Spanish14381450

Instruction Following Kimi K2.5 leads

Grok 4.1: 74.0 (#106), Kimi K2.5: 75.5 (#60)

BenchmarkGrok 4.1Kimi K2.5
LMArena Instruction Following14001431

Long Context Kimi K2.5 leads

Grok 4.1: 43.2 (#96), Kimi K2.5: 52.1 (#7)

BenchmarkGrok 4.1Kimi K2.5
LMArena Longer Query14161445
Fiction.LiveBench—86.1%
CL-bench—19.3%
CL-bench Life—13.2%

Writing & Preference Kimi K2.5 leads

Grok 4.1: 62.6 (#71), Kimi K2.5: 65.3 (#51)

BenchmarkGrok 4.1Kimi K2.5
LMArena Text14371445
LMArena Creative Writing14111423
LMArena Multi-Turn14381444
EQ-Bench Creative Writing—1579

Frequently asked questions

Is Grok 4.1 better than Kimi K2.5?

Kimi K2.5 is the stronger model overall, scoring 47.8 to 40.8 on the Noometry Index.

Is Grok 4.1 or Kimi K2.5 better for coding?

Kimi K2.5 scores higher on coding benchmarks: 48.7 versus 33.4 in the Noometry coding category.

How many benchmarks do Grok 4.1 and Kimi K2.5 share?

18 benchmarks have published results for both models. Grok 4.1 has 19 scored results on Noometry and Kimi K2.5 has 51.

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