Noometry

Model comparison

GPT-6 Astra vs Grok 3

GPT-6 Astra is the stronger model overall, scoring 70.8 to 39.9 on the Noometry Index.

Last verified . 26 shared benchmarks.

GPT-6 Astra OpenAI

70.8

Rank #1 Confirmed

Grok 3 xAI

39.9

Rank #157 Confirmed

Summary

  • They share 26 benchmarks with published results for both. GPT-6 Astra scores higher in 9 categories and Grok 3 in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where GPT-6 Astra leads 85.1 to 13.7.
  • The biggest single-benchmark swing is ARC-AGI-2: 95% for GPT-6 Astra and 0% for Grok 3.

Side by side

GPT-6 AstraGrok 3
ProviderOpenAIxAI
Noometry Index70.839.9
Released2026-09-032025-04-09
WeightsProprietaryProprietary
Context window1.05M—
Max output128K—
Input $ / M tokens$10—
Output $ / M tokens$50—
Results tracked5640

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Category by category

Coding GPT-6 Astra leads

GPT-6 Astra: 73.7 (#2), Grok 3: 41.9 (#115)

BenchmarkGPT-6 AstraGrok 3
WeirdML93.6%37.2%
LMArena Coding14871432
DeepSWE74.1%—
FrontierCode53.3%—
Aider Polyglot—53.3%
LMArena WebDev1786—
FrontierSWE65.5%—
SciCode56.5%—
GSO79.4%—
MirrorCode46.7%—
ALE-Bench2,951—

Agentic & Tool Use GPT-6 Astra leads

GPT-6 Astra: 52.9 (#3), Grok 3: 30.5 (#76)

BenchmarkGPT-6 AstraGrok 3
BALROG68.3%29.5%
APEX-Agents64.7%—
Remote Labor Index20.8%—
GDP.pdf34.2%—
Vending-Bench 215,515—

Reasoning GPT-6 Astra leads

GPT-6 Astra: 85.1 (#1), Grok 3: 13.7 (#333)

BenchmarkGPT-6 AstraGrok 3
ARC-AGI-295%0%
ARC-AGI-198.5%5.5%
LMArena Hard Prompts14621434
Epoch Capabilities Index166.45138.33
SimpleBench—36.1%
Kagi LLM Benchmark—61.3%
NYT Connections (extended)98.1%—
CritPt31.7%—
Chess Puzzles72%—
EBR-Bench76.2%—
Mystery Game Puzzles84%—
DTBench97.3%—
LMCA64.4%—
Bench to the Future 30.14—

Math GPT-6 Astra leads

GPT-6 Astra: 93.5 (#2), Grok 3: 38.0 (#145)

BenchmarkGPT-6 AstraGrok 3
OTIS Mock AIME 2024-2025100%55.6%
LMArena Math14651391
FrontierMath (Tiers 1-3)93.7%—
FrontierMath Tier 497.6%—
ProofBench99%—
Omni-MATH—46.4%
MATH Level 5—88.7%
FrontierMath (Feb 2025 set)—3.8%
FrontierMath Erdős2.9%—
FrontierMath Tier 4 (v1)—0%

Knowledge GPT-6 Astra leads

GPT-6 Astra: 75.3 (#1), Grok 3: 46.2 (#82)

BenchmarkGPT-6 AstraGrok 3
GPQA Diamond95.8%75.8%
Vectara Hallucination Rate8.7%5.8%
LMArena Expert14831421
Humanity's Last Exam54.8%—
SimpleQA Verified75.6%—
MMLU-Pro—78.8%
Confabulations—14.2%
GPQA (HELM)—65%

Multimodal Not comparable

GPT-6 Astra: 55.0 (#3), Grok 3: —

BenchmarkGPT-6 AstraGrok 3
LMArena Vision1281—
Blueprint-Bench 249.7%—
Furniture Assembly80%—
LMArena Document1468—

Multilingual GPT-6 Astra leads

GPT-6 Astra: 53.7 (#61), Grok 3: 52.3 (#87)

BenchmarkGPT-6 AstraGrok 3
LMArena Non-English14301410
LMArena Chinese14841448
LMArena French14561460
LMArena German14401431
LMArena Japanese13791387
LMArena Korean14261373
LMArena Russian14361416
LMArena Spanish14071417

Instruction Following GPT-6 Astra leads

GPT-6 Astra: 76.3 (#44), Grok 3: 75.0 (#73)

BenchmarkGPT-6 AstraGrok 3
LMArena Instruction Following14501409
IFEval—88.4%

Long Context GPT-6 Astra leads

GPT-6 Astra: 44.5 (#62), Grok 3: 38.7 (#192)

BenchmarkGPT-6 AstraGrok 3
LMArena Longer Query14561439
Fiction.LiveBench—58.3%

Writing & Preference GPT-6 Astra leads

GPT-6 Astra: 75.3 (#7), Grok 3: 55.8 (#141)

BenchmarkGPT-6 AstraGrok 3
LMArena Text14411426
LMArena Creative Writing14181414
EQ-Bench Creative Writing21731186
LMArena Multi-Turn14481425
Short-Story Creative Writing—76.4%
WildBench—84.9%

Frequently asked questions

Is GPT-6 Astra better than Grok 3?

GPT-6 Astra is the stronger model overall, scoring 70.8 to 39.9 on the Noometry Index.

Is GPT-6 Astra or Grok 3 better for coding?

GPT-6 Astra scores higher on coding benchmarks: 73.7 versus 41.9 in the Noometry coding category.

How many benchmarks do GPT-6 Astra and Grok 3 share?

26 benchmarks have published results for both models. GPT-6 Astra has 56 scored results on Noometry and Grok 3 has 40.

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