Noometry

Model comparison

GPT-6 Sol vs Grok 4 Fast

GPT-6 Sol is the stronger model overall, scoring 61.8 to 39.4 on the Noometry Index.

Last verified . 23 shared benchmarks.

GPT-6 Sol OpenAI

61.8

Rank #12 Confirmed

Grok 4 Fast xAI

39.4

Rank #167 Confirmed

Summary

  • They share 23 benchmarks with published results for both. GPT-6 Sol scores higher in 7 categories and Grok 4 Fast in 2 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where GPT-6 Sol leads 74.0 to 22.2.
  • The biggest single-benchmark swing is ARC-AGI-2: 89.6% for GPT-6 Sol and 5.3% for Grok 4 Fast.

Side by side

GPT-6 SolGrok 4 Fast
ProviderOpenAIxAI
Noometry Index61.839.4
Released2026-09-222025-09-19
WeightsProprietaryProprietary
Context window1.05M—
Max output128K—
Input $ / M tokens$2—
Output $ / M tokens$10—
Results tracked4530

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Category by category

Coding GPT-6 Sol leads

GPT-6 Sol: 60.1 (#11), Grok 4 Fast: 32.5 (#271)

BenchmarkGPT-6 SolGrok 4 Fast
LMArena WebDev16881159
LMArena Coding14471429
DeepSWE68.8%—
FrontierCode49.3%—
SciCode57.6%—
WeirdML—42.9%
ALE-Bench2,462—

Agentic & Tool Use GPT-6 Sol leads

GPT-6 Sol: 37.2 (#36), Grok 4 Fast: 29.5 (#86)

BenchmarkGPT-6 SolGrok 4 Fast
APEX-Agents54.3%—
τ²-bench Banking—15.7%
Cybench—30%
GDP.pdf26.4%—
LMArena Search—1171
Vending-Bench 214,428—

Reasoning GPT-6 Sol leads

GPT-6 Sol: 74.0 (#9), Grok 4 Fast: 22.2 (#201)

BenchmarkGPT-6 SolGrok 4 Fast
ARC-AGI-289.6%5.3%
ARC-AGI-195.5%48.5%
LMArena Hard Prompts14181412
DTBench97.3%82.7%
Epoch Capabilities Index162.72144.2
Kagi LLM Benchmark—66.1%
NYT Connections (extended)90.1%—
CritPt30.9%—
EBR-Bench53.3%—
Mystery Game Puzzles56%—
LMCA59.1%—
ForecastBench—60.5

Math GPT-6 Sol leads

GPT-6 Sol: 87.2 (#7), Grok 4 Fast: 38.9 (#123)

BenchmarkGPT-6 SolGrok 4 Fast
LMArena Math14021419
FrontierMath (Tiers 1-3)89.8%—
FrontierMath Tier 490%—
OTIS Mock AIME 2024-2025100%—
ProofBench83%—

Knowledge GPT-6 Sol leads

GPT-6 Sol: 64.8 (#15), Grok 4 Fast: 32.0 (#214)

BenchmarkGPT-6 SolGrok 4 Fast
Vectara Hallucination Rate6.5%19.7%
LMArena Expert14391411
GPQA Diamond94.3%—
SimpleQA Verified60.7%—

Multimodal Not comparable

GPT-6 Sol: 47.6 (#10), Grok 4 Fast: —

BenchmarkGPT-6 SolGrok 4 Fast
LMArena Vision1245—
Blueprint-Bench 236.9%—
Furniture Assembly58.3%—

Multilingual Too close to call

GPT-6 Sol: 50.5 (#118), Grok 4 Fast: 51.3 (#111)

BenchmarkGPT-6 SolGrok 4 Fast
LMArena Non-English13851396
LMArena Chinese14051457
LMArena French14101431
LMArena German13901383
LMArena Japanese13851352
LMArena Korean13411357
LMArena Russian14011389
LMArena Spanish13841415

Instruction Following GPT-6 Sol leads

GPT-6 Sol: 74.5 (#94), Grok 4 Fast: 73.2 (#121)

BenchmarkGPT-6 SolGrok 4 Fast
LMArena Instruction Following14121387

Long Context Grok 4 Fast leads

GPT-6 Sol: 43.1 (#108), Grok 4 Fast: 63.2 (#3)

BenchmarkGPT-6 SolGrok 4 Fast
LMArena Longer Query14111415
Fiction.LiveBench—94.4%

Writing & Preference GPT-6 Sol leads

GPT-6 Sol: 71.9 (#18), Grok 4 Fast: 60.0 (#102)

BenchmarkGPT-6 SolGrok 4 Fast
LMArena Text13951407
LMArena Creative Writing13781387
LMArena Multi-Turn14121414
EQ-Bench Creative Writing2125—

Frequently asked questions

Is GPT-6 Sol better than Grok 4 Fast?

GPT-6 Sol is the stronger model overall, scoring 61.8 to 39.4 on the Noometry Index.

Is GPT-6 Sol or Grok 4 Fast better for coding?

GPT-6 Sol scores higher on coding benchmarks: 60.1 versus 32.5 in the Noometry coding category.

How many benchmarks do GPT-6 Sol and Grok 4 Fast share?

23 benchmarks have published results for both models. GPT-6 Sol has 45 scored results on Noometry and Grok 4 Fast has 30.

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