Noometry

Model comparison

Grok 4 Fast vs Inkling-Small

Inkling-Small is the stronger model overall, scoring 46.5 to 39.0 on the Noometry Index.

Last verified . 21 shared benchmarks.

Grok 4 Fast xAI

39.0

Rank #164 Confirmed

Inkling-Small Thinking Machines Lab

46.5

Rank #57 Confirmed

Summary

  • They share 21 benchmarks with published results for both. Grok 4 Fast scores higher in 2 categories and Inkling-Small in 6 categories; 5 gaps are clear of the uncertainty.
  • The widest gap is in long context, where Grok 4 Fast leads 63.2 to 42.7.
  • The biggest single-benchmark swing is ARC-AGI-1: 48.5% for Grok 4 Fast and 84% for Inkling-Small.
  • Inkling-Small has downloadable open weights; the other is API-only.

Side by side

Grok 4 FastInkling-Small
ProviderxAIThinking Machines Lab
Noometry Index39.046.5
Released2025-09-192026-07-15
WeightsProprietaryOpen
Context window—524K
Max output—1.05M
Input $ / M tokens—$0.45
Output $ / M tokens—$1.20
Results tracked3033

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Category by category

Coding Inkling-Small leads

Grok 4 Fast: 32.3 (#264), Inkling-Small: 43.3 (#80)

BenchmarkGrok 4 FastInkling-Small
LMArena WebDev11601408
LMArena Coding14291451
SciCode—48.7%
WeirdML42.9%—

Agentic & Tool Use Not comparable

Grok 4 Fast: 29.3 (#80), Inkling-Small: —

BenchmarkGrok 4 FastInkling-Small
τ²-bench Banking15.7%—
Cybench30%—
LMArena Search1171—

Reasoning Inkling-Small leads

Grok 4 Fast: 22.5 (#179), Inkling-Small: 39.0 (#53)

BenchmarkGrok 4 FastInkling-Small
ARC-AGI-25.3%40.1%
ARC-AGI-148.5%84%
LMArena Hard Prompts14131424
Epoch Capabilities Index144.21150.13
Kagi LLM Benchmark66.1%—
CritPt—8.3%
Chess Puzzles—18%
Mystery Game Puzzles—6%
DTBench82.7%—
ForecastBench60.5—

Math Inkling-Small leads

Grok 4 Fast: 36.1 (#126), Inkling-Small: 44.9 (#65)

BenchmarkGrok 4 FastInkling-Small
LMArena Math14191453
FrontierMath (Tiers 1-3)—46.3%
FrontierMath Tier 4—17.1%
OTIS Mock AIME 2024-2025—90%
ProofBench—6%

Knowledge Inkling-Small leads

Grok 4 Fast: 31.5 (#211), Inkling-Small: 48.3 (#71)

BenchmarkGrok 4 FastInkling-Small
LMArena Expert14111442
GPQA Diamond—88.5%
SimpleQA Verified—19.1%
Vectara Hallucination Rate19.7%—

Multimodal Not comparable

Grok 4 Fast: —, Inkling-Small: 38.4 (#59)

BenchmarkGrok 4 FastInkling-Small
LMArena Vision—1235

Multilingual Too close to call

Grok 4 Fast: 51.5 (#106), Inkling-Small: 51.7 (#102)

BenchmarkGrok 4 FastInkling-Small
LMArena Non-English13971400
LMArena Chinese14581458
LMArena French14331438
LMArena German13831412
LMArena Japanese13581399
LMArena Korean13591355
LMArena Russian13871392
LMArena Spanish14141426

Instruction Following Too close to call

Grok 4 Fast: 73.4 (#116), Inkling-Small: 73.9 (#112)

BenchmarkGrok 4 FastInkling-Small
LMArena Instruction Following13881397

Long Context Grok 4 Fast leads

Grok 4 Fast: 63.2 (#3), Inkling-Small: 42.7 (#113)

BenchmarkGrok 4 FastInkling-Small
LMArena Longer Query14151401
Fiction.LiveBench94.4%—

Writing & Preference Too close to call

Grok 4 Fast: 60.2 (#96), Inkling-Small: 59.8 (#102)

BenchmarkGrok 4 FastInkling-Small
LMArena Text14071413
LMArena Creative Writing13881330
LMArena Multi-Turn14141420
EQ-Bench Creative Writing—1491

Frequently asked questions

Is Grok 4 Fast better than Inkling-Small?

Inkling-Small is the stronger model overall, scoring 46.5 to 39.0 on the Noometry Index.

Is Grok 4 Fast or Inkling-Small better for coding?

Inkling-Small scores higher on coding benchmarks: 43.3 versus 32.3 in the Noometry coding category.

How many benchmarks do Grok 4 Fast and Inkling-Small share?

21 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Inkling-Small has 33.

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