Noometry

Model comparison

Grok 4 Fast vs Olmo 3.1 32b Instruct

Grok 4 Fast and Olmo 3.1 32b Instruct score almost the same on the Noometry Index (39.4 vs 39.4), so choose on price, context window or the category you care about most.

Last verified . 16 shared benchmarks.

Grok 4 Fast xAI

39.4

Rank #167 Confirmed

Olmo 3.1 32b Instruct Allen Institute for AI (Ai2)

39.4

Rank #168 Confirmed

Summary

  • They share 16 benchmarks with published results for both. Grok 4 Fast scores higher in 5 categories and Olmo 3.1 32b Instruct in 3 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in long context, where Grok 4 Fast leads 63.2 to 39.9.
  • Olmo 3.1 32b Instruct has downloadable open weights; the other is API-only.

Side by side

Grok 4 FastOlmo 3.1 32b Instruct
ProviderxAIAllen Institute for AI (Ai2)
Noometry Index39.439.4
Released2025-09-19—
WeightsProprietaryOpen
Context window——
Max output——
Input $ / M tokens——
Output $ / M tokens——
Results tracked3016

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

Category by category

Coding Olmo 3.1 32b Instruct leads

Grok 4 Fast: 32.5 (#271), Olmo 3.1 32b Instruct: 39.5 (#157)

BenchmarkGrok 4 FastOlmo 3.1 32b Instruct
LMArena Coding14291347
LMArena WebDev1159—
WeirdML42.9%—

Agentic & Tool Use Not comparable

Grok 4 Fast: 29.5 (#86), Olmo 3.1 32b Instruct: —

BenchmarkGrok 4 FastOlmo 3.1 32b Instruct
τ²-bench Banking15.7%—
Cybench30%—
LMArena Search1171—

Reasoning Olmo 3.1 32b Instruct leads

Grok 4 Fast: 22.2 (#201), Olmo 3.1 32b Instruct: 26.4 (#132)

BenchmarkGrok 4 FastOlmo 3.1 32b Instruct
LMArena Hard Prompts14121322
ARC-AGI-25.3%—
Kagi LLM Benchmark66.1%—
ARC-AGI-148.5%—
DTBench82.7%—
Epoch Capabilities Index144.2—
ForecastBench60.5—

Math Grok 4 Fast leads

Grok 4 Fast: 38.9 (#123), Olmo 3.1 32b Instruct: 36.3 (#167)

BenchmarkGrok 4 FastOlmo 3.1 32b Instruct
LMArena Math14191305

Knowledge Olmo 3.1 32b Instruct leads

Grok 4 Fast: 32.0 (#214), Olmo 3.1 32b Instruct: 36.1 (#175)

BenchmarkGrok 4 FastOlmo 3.1 32b Instruct
LMArena Expert14111308
Vectara Hallucination Rate19.7%—

Multilingual Grok 4 Fast leads

Grok 4 Fast: 51.3 (#111), Olmo 3.1 32b Instruct: 42.6 (#191)

BenchmarkGrok 4 FastOlmo 3.1 32b Instruct
LMArena Non-English13961275
LMArena Chinese14571304
LMArena French14311328
LMArena German13831282
LMArena Korean13571206
LMArena Russian13891268
LMArena Spanish14151336
LMArena Japanese1352—

Instruction Following Grok 4 Fast leads

Grok 4 Fast: 73.2 (#121), Olmo 3.1 32b Instruct: 68.6 (#187)

BenchmarkGrok 4 FastOlmo 3.1 32b Instruct
LMArena Instruction Following13871299

Long Context Grok 4 Fast leads

Grok 4 Fast: 63.2 (#3), Olmo 3.1 32b Instruct: 39.9 (#166)

BenchmarkGrok 4 FastOlmo 3.1 32b Instruct
LMArena Longer Query14151312
Fiction.LiveBench94.4%—

Writing & Preference Grok 4 Fast leads

Grok 4 Fast: 60.0 (#102), Olmo 3.1 32b Instruct: 50.2 (#185)

BenchmarkGrok 4 FastOlmo 3.1 32b Instruct
LMArena Text14071311
LMArena Creative Writing13871264
LMArena Multi-Turn14141309

Frequently asked questions

Is Grok 4 Fast better than Olmo 3.1 32b Instruct?

Grok 4 Fast and Olmo 3.1 32b Instruct score almost the same on the Noometry Index (39.4 vs 39.4), so choose on price, context window or the category you care about most.

Is Grok 4 Fast or Olmo 3.1 32b Instruct better for coding?

Olmo 3.1 32b Instruct scores higher on coding benchmarks: 39.5 versus 32.5 in the Noometry coding category.

How many benchmarks do Grok 4 Fast and Olmo 3.1 32b Instruct share?

16 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Olmo 3.1 32b Instruct has 16.

Related comparisons

Go deeper