Noometry

Model comparison

Grok 4.1 Fast vs Kimi K2 Thinking Turbo

Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.8 to 41.4 on the Noometry Index.

Last verified . 18 shared benchmarks.

Grok 4.1 Fast xAI

41.4

Rank #136 Confirmed

Kimi K2 Thinking Turbo Moonshot AI

45.8

Rank #70 Confirmed

Summary

  • They share 18 benchmarks with published results for both. Grok 4.1 Fast scores higher in 1 category and Kimi K2 Thinking Turbo in 7 categories; 6 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where Kimi K2 Thinking Turbo leads 50.9 to 33.1.
  • Kimi K2 Thinking Turbo has downloadable open weights; the other is API-only.

Side by side

Grok 4.1 FastKimi K2 Thinking Turbo
ProviderxAIMoonshot AI
Noometry Index41.445.8
Released2025-06-272025-11-06
WeightsProprietaryOpen
Context window128K—
Max output30K—
Input $ / M tokens$0.20—
Output $ / M tokens$0.50—
Results tracked3221

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Category by category

Coding Kimi K2 Thinking Turbo leads

Grok 4.1 Fast: 34.1 (#245), Kimi K2 Thinking Turbo: 38.4 (#178)

BenchmarkGrok 4.1 FastKimi K2 Thinking Turbo
LMArena WebDev12421322
LMArena Coding14111454
ALE-Bench394.93—

Agentic & Tool Use Not comparable

Grok 4.1 Fast: 36.3 (#39), Kimi K2 Thinking Turbo: —

BenchmarkGrok 4.1 FastKimi K2 Thinking Turbo
Berkeley Function Calling Leaderboard69.6%—
τ²-bench Banking13.1%—
LMArena Search1171—
Vending-Bench 21,107—

Reasoning Grok 4.1 Fast leads

Grok 4.1 Fast: 43.4 (#49), Kimi K2 Thinking Turbo: 32.5 (#75)

BenchmarkGrok 4.1 FastKimi K2 Thinking Turbo
LMArena Hard Prompts14071428
SimpleBench56%—
NYT Connections (extended)87.4%—
Chess Puzzles—20%
DTBench87.7%—
ForecastBench61—

Math Kimi K2 Thinking Turbo leads

Grok 4.1 Fast: 31.9 (#221), Kimi K2 Thinking Turbo: 47.4 (#68)

BenchmarkGrok 4.1 FastKimi K2 Thinking Turbo
LMArena Math14081429
MathArena Final-Answer Competitions60.9%—
OTIS Mock AIME 2024-2025—83.1%
ProofBench4%—

Knowledge Kimi K2 Thinking Turbo leads

Grok 4.1 Fast: 33.1 (#207), Kimi K2 Thinking Turbo: 50.9 (#69)

BenchmarkGrok 4.1 FastKimi K2 Thinking Turbo
LMArena Expert13991439
GPQA Diamond—84.2%
Vectara Hallucination Rate17.8%—

Multimodal Not comparable

Grok 4.1 Fast: 37.0 (#76), Kimi K2 Thinking Turbo: —

BenchmarkGrok 4.1 FastKimi K2 Thinking Turbo
LMArena Vision1201—

Multilingual Too close to call

Grok 4.1 Fast: 51.0 (#114), Kimi K2 Thinking Turbo: 51.4 (#109)

BenchmarkGrok 4.1 FastKimi K2 Thinking Turbo
LMArena Non-English13911398
LMArena Chinese14411456
LMArena French14151425
LMArena German14041390
LMArena Japanese13491357
LMArena Korean13611330
LMArena Russian13871391
LMArena Spanish14131406

Instruction Following Kimi K2 Thinking Turbo leads

Grok 4.1 Fast: 72.7 (#133), Kimi K2 Thinking Turbo: 74.0 (#109)

BenchmarkGrok 4.1 FastKimi K2 Thinking Turbo
LMArena Instruction Following13761403

Long Context Too close to call

Grok 4.1 Fast: 42.4 (#126), Kimi K2 Thinking Turbo: 43.2 (#102)

BenchmarkGrok 4.1 FastKimi K2 Thinking Turbo
LMArena Longer Query13901415

Writing & Preference Kimi K2 Thinking Turbo leads

Grok 4.1 Fast: 57.2 (#131), Kimi K2 Thinking Turbo: 60.0 (#104)

BenchmarkGrok 4.1 FastKimi K2 Thinking Turbo
LMArena Text14081415
LMArena Creative Writing13941374
LMArena Multi-Turn13891414
EQ-Bench Creative Writing1327—

Frequently asked questions

Is Grok 4.1 Fast better than Kimi K2 Thinking Turbo?

Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.8 to 41.4 on the Noometry Index.

Is Grok 4.1 Fast or Kimi K2 Thinking Turbo better for coding?

Kimi K2 Thinking Turbo scores higher on coding benchmarks: 38.4 versus 34.1 in the Noometry coding category.

How many benchmarks do Grok 4.1 Fast and Kimi K2 Thinking Turbo share?

18 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Kimi K2 Thinking Turbo has 21.

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