Noometry

Model comparison

Grok 4 Fast vs Kimi K2.7 Code

Kimi K2.7 Code is the stronger model overall, scoring 43.0 to 39.0 on the Noometry Index.

Last verified . 3 shared benchmarks.

Grok 4 Fast xAI

39.0

Rank #164 Confirmed

Kimi K2.7 Code Moonshot AI

43.0

Rank #90 Confirmed

Summary

  • They share 3 benchmarks with published results for both. Grok 4 Fast scores higher in 1 category and Kimi K2.7 Code in 4 categories; 5 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where Kimi K2.7 Code leads 53.6 to 31.5.
  • The biggest single-benchmark swing is WeirdML: 42.9% for Grok 4 Fast and 54.1% for Kimi K2.7 Code.
  • Kimi K2.7 Code has downloadable open weights; the other is API-only.

Side by side

Grok 4 FastKimi K2.7 Code
ProviderxAIMoonshot AI
Noometry Index39.043.0
Released2025-09-192026-06-12
WeightsProprietaryOpen
Context window—262K
Max output—262K
Input $ / M tokens—$0.95
Output $ / M tokens—$4
Results tracked3019

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Category by category

Coding Kimi K2.7 Code leads

Grok 4 Fast: 32.3 (#264), Kimi K2.7 Code: 42.4 (#92)

BenchmarkGrok 4 FastKimi K2.7 Code
LMArena WebDev11601473
WeirdML42.9%54.1%
DeepSWE—30.5%
FrontierCode—30.1%
SciCode—47.5%
LMArena Coding1429—
ALE-Bench—886.23

Agentic & Tool Use Grok 4 Fast leads

Grok 4 Fast: 29.3 (#80), Kimi K2.7 Code: 23.9 (#115)

BenchmarkGrok 4 FastKimi K2.7 Code
APEX-Agents—37.6%
τ²-bench Banking15.7%—
Cybench30%—
GBAEval—0.9%
LMArena Search1171—
Vending-Bench 2—5,083

Reasoning Kimi K2.7 Code leads

Grok 4 Fast: 22.5 (#179), Kimi K2.7 Code: 38.2 (#56)

BenchmarkGrok 4 FastKimi K2.7 Code
Epoch Capabilities Index144.21150.01
ARC-AGI-25.3%—
SimpleBench—57.9%
Kagi LLM Benchmark66.1%—
ARC-AGI-148.5%—
CritPt—10%
Chess Puzzles—21%
LMArena Hard Prompts1413—
DTBench82.7%—
Surface Evolver Bench—48.8%
ForecastBench60.5—

Math Kimi K2.7 Code leads

Grok 4 Fast: 36.1 (#126), Kimi K2.7 Code: 52.6 (#39)

BenchmarkGrok 4 FastKimi K2.7 Code
FrontierMath (Tiers 1-3)—54%
FrontierMath Tier 4—12.2%
OTIS Mock AIME 2024-2025—95.6%
LMArena Math1419—

Knowledge Kimi K2.7 Code leads

Grok 4 Fast: 31.5 (#211), Kimi K2.7 Code: 53.6 (#51)

BenchmarkGrok 4 FastKimi K2.7 Code
GPQA Diamond—87.9%
SimpleQA Verified—36.5%
Vectara Hallucination Rate19.7%—
LMArena Expert1411—

Multilingual Not comparable

Grok 4 Fast: 51.5 (#106), Kimi K2.7 Code: —

BenchmarkGrok 4 FastKimi K2.7 Code
LMArena Non-English1397—
LMArena Chinese1458—
LMArena French1433—
LMArena German1383—
LMArena Japanese1358—
LMArena Korean1359—
LMArena Russian1387—
LMArena Spanish1414—

Instruction Following Not comparable

Grok 4 Fast: 73.4 (#116), Kimi K2.7 Code: —

BenchmarkGrok 4 FastKimi K2.7 Code
LMArena Instruction Following1388—

Long Context Not comparable

Grok 4 Fast: 63.2 (#3), Kimi K2.7 Code: —

BenchmarkGrok 4 FastKimi K2.7 Code
Fiction.LiveBench94.4%—
LMArena Longer Query1415—

Writing & Preference Not comparable

Grok 4 Fast: 60.2 (#96), Kimi K2.7 Code: —

BenchmarkGrok 4 FastKimi K2.7 Code
LMArena Text1407—
LMArena Creative Writing1388—
LMArena Multi-Turn1414—

Frequently asked questions

Is Grok 4 Fast better than Kimi K2.7 Code?

Kimi K2.7 Code is the stronger model overall, scoring 43.0 to 39.0 on the Noometry Index.

Is Grok 4 Fast or Kimi K2.7 Code better for coding?

Kimi K2.7 Code scores higher on coding benchmarks: 42.4 versus 32.3 in the Noometry coding category.

How many benchmarks do Grok 4 Fast and Kimi K2.7 Code share?

3 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Kimi K2.7 Code has 19.

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