Noometry

Model comparison

gpt-oss-20b vs Grok 4

Grok 4 is the stronger model overall, scoring 48.1 to 32.5 on the Noometry Index.

Last verified . 28 shared benchmarks.

gpt-oss-20b OpenAI

32.5

Rank #255 Confirmed

Grok 4 xAI

48.1

Rank #56 Confirmed

Summary

  • They share 28 benchmarks with published results for both. gpt-oss-20b scores higher in 0 categories and Grok 4 in 9 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in long context, where Grok 4 leads 63.1 to 37.9.
  • The biggest single-benchmark swing is GPQA Diamond: 60.8% for gpt-oss-20b and 87% for Grok 4.
  • gpt-oss-20b has downloadable open weights; the other is API-only.

Side by side

gpt-oss-20bGrok 4
ProviderOpenAIxAI
Noometry Index32.548.1
Released2025-08-052025-07-09
WeightsOpenProprietary
Context window131K—
Max output16K—
Input $ / M tokens$0.018—
Output $ / M tokens$0.09—
Results tracked3448

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Category by category

Coding Grok 4 leads

gpt-oss-20b: 37.6 (#192), Grok 4: 50.3 (#46)

Benchmarkgpt-oss-20bGrok 4
WeirdML40.9%45.7%
LMArena Coding13061408
Aider Polyglot—79.6%
SciCode34.4%—
ALE-Bench566.05—

Agentic & Tool Use Grok 4 leads

gpt-oss-20b: 9.3 (#154), Grok 4: 32.3 (#68)

Benchmarkgpt-oss-20bGrok 4
Terminal-Bench3.4%27.2%
Berkeley Function Calling Leaderboard—63%
GDPval—21.1%
Cybench—43%
DeepResearch Bench—47.3%
BALROG—43.6%
LMArena Search—1142
METR Time Horizons—66.6%

Reasoning Grok 4 leads

gpt-oss-20b: 19.3 (#261), Grok 4: 36.7 (#65)

Benchmarkgpt-oss-20bGrok 4
Kagi LLM Benchmark53.2%73.6%
Chess Puzzles4%28%
LMArena Hard Prompts12741409
Epoch Capabilities Index137.82146.44
ARC-AGI-2—16%
SimpleBench—60.5%
ARC-AGI-1—66.7%
CritPt1.4%—
DTBench68%—
LMCA14.5%—
ForecastBench—60.9

Math Grok 4 leads

gpt-oss-20b: 39.4 (#103), Grok 4: 48.4 (#64)

Benchmarkgpt-oss-20bGrok 4
OTIS Mock AIME 2024-202565.3%84%
Omni-MATH56.5%60.3%
LMArena Math13171422
FrontierMath (Feb 2025 set)—19.7%
FrontierMath Tier 4 (v1)—2.1%

Knowledge Grok 4 leads

gpt-oss-20b: 34.6 (#195), Grok 4: 53.8 (#55)

Benchmarkgpt-oss-20bGrok 4
GPQA Diamond60.8%87%
MMLU-Pro74%85.1%
GPQA (HELM)59.4%72.7%
LMArena Expert12581415
Confabulations—12.4%

Multimodal Not comparable

gpt-oss-20b: —, Grok 4: 33.7 (#94)

Benchmarkgpt-oss-20bGrok 4
LMArena Vision—1210
GeoBench—45%

Multilingual Grok 4 leads

gpt-oss-20b: 42.2 (#197), Grok 4: 51.8 (#103)

Benchmarkgpt-oss-20bGrok 4
LMArena Non-English12681403
LMArena Chinese13141427
LMArena German12551429
LMArena Japanese12441394
LMArena Korean12361377
LMArena Russian12781410
LMArena Spanish12671420
LMArena French—1418

Instruction Following Grok 4 leads

gpt-oss-20b: 61.8 (#240), Grok 4: 79.2 (#5)

Benchmarkgpt-oss-20bGrok 4
IFEval73.2%94.9%
LMArena Instruction Following12361387

Long Context Grok 4 leads

gpt-oss-20b: 37.9 (#209), Grok 4: 63.1 (#4)

Benchmarkgpt-oss-20bGrok 4
LMArena Longer Query12501409
Fiction.LiveBench—94.4%

Writing & Preference Grok 4 leads

gpt-oss-20b: 35.5 (#265), Grok 4: 58.5 (#116)

Benchmarkgpt-oss-20bGrok 4
LMArena Text12871411
LMArena Creative Writing12011397
WildBench73.7%79.7%
LMArena Multi-Turn12681416
Short-Story Creative Writing—76.9%
EQ-Bench Creative Writing666—

Frequently asked questions

Is gpt-oss-20b better than Grok 4?

Grok 4 is the stronger model overall, scoring 48.1 to 32.5 on the Noometry Index.

Is gpt-oss-20b or Grok 4 better for coding?

Grok 4 scores higher on coding benchmarks: 50.3 versus 37.6 in the Noometry coding category.

How many benchmarks do gpt-oss-20b and Grok 4 share?

28 benchmarks have published results for both models. gpt-oss-20b has 34 scored results on Noometry and Grok 4 has 48.

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