Noometry

Model comparison

GPT-5.3 Chat vs Grok 4

Grok 4 is the stronger model overall, scoring 48.1 to 42.8 on the Noometry Index.

Last verified . 17 shared benchmarks.

GPT-5.3 Chat OpenAI

42.8

Rank #109 Confirmed

Grok 4 xAI

48.1

Rank #56 Confirmed

Summary

  • They share 17 benchmarks with published results for both. GPT-5.3 Chat scores higher in 1 category and Grok 4 in 7 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in long context, where Grok 4 leads 63.1 to 42.6.

Side by side

GPT-5.3 ChatGrok 4
ProviderOpenAIxAI
Noometry Index42.848.1
Released2026-03-032025-07-09
WeightsProprietaryProprietary
Context window128K—
Max output16K—
Input $ / M tokens$1.75—
Output $ / M tokens$14—
Results tracked1848

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Category by category

Coding Grok 4 leads

GPT-5.3 Chat: 41.4 (#124), Grok 4: 50.3 (#46)

BenchmarkGPT-5.3 ChatGrok 4
LMArena Coding14081408
Aider Polyglot—79.6%
WeirdML—45.7%

Agentic & Tool Use Not comparable

GPT-5.3 Chat: —, Grok 4: 32.3 (#68)

BenchmarkGPT-5.3 ChatGrok 4
Terminal-Bench—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-5.3 Chat: 28.5 (#102), Grok 4: 36.7 (#65)

BenchmarkGPT-5.3 ChatGrok 4
LMArena Hard Prompts13991409
ARC-AGI-2—16%
SimpleBench—60.5%
Kagi LLM Benchmark—73.6%
ARC-AGI-1—66.7%
Chess Puzzles—28%
Epoch Capabilities Index—146.44
ForecastBench—60.9

Math Grok 4 leads

GPT-5.3 Chat: 38.2 (#142), Grok 4: 48.4 (#64)

BenchmarkGPT-5.3 ChatGrok 4
LMArena Math13891422
OTIS Mock AIME 2024-2025—84%
Omni-MATH—60.3%
FrontierMath (Feb 2025 set)—19.7%
FrontierMath Tier 4 (v1)—2.1%

Knowledge Grok 4 leads

GPT-5.3 Chat: 38.8 (#140), Grok 4: 53.8 (#55)

BenchmarkGPT-5.3 ChatGrok 4
LMArena Expert13971415
GPQA Diamond—87%
MMLU-Pro—85.1%
Confabulations—12.4%
GPQA (HELM)—72.7%

Multimodal Not comparable

GPT-5.3 Chat: —, Grok 4: 33.7 (#94)

BenchmarkGPT-5.3 ChatGrok 4
LMArena Vision—1210
GeoBench—45%

Multilingual Grok 4 leads

GPT-5.3 Chat: 50.3 (#124), Grok 4: 51.8 (#103)

BenchmarkGPT-5.3 ChatGrok 4
LMArena Non-English13821403
LMArena Chinese14321427
LMArena French13971418
LMArena German13841429
LMArena Japanese13521394
LMArena Korean13461377
LMArena Russian14001410
LMArena Spanish13711420

Instruction Following Grok 4 leads

GPT-5.3 Chat: 72.8 (#129), Grok 4: 79.2 (#5)

BenchmarkGPT-5.3 ChatGrok 4
LMArena Instruction Following13781387
IFEval—94.9%

Long Context Grok 4 leads

GPT-5.3 Chat: 42.6 (#120), Grok 4: 63.1 (#4)

BenchmarkGPT-5.3 ChatGrok 4
LMArena Longer Query13961409
Fiction.LiveBench—94.4%

Writing & Preference GPT-5.3 Chat leads

GPT-5.3 Chat: 63.1 (#68), Grok 4: 58.5 (#116)

BenchmarkGPT-5.3 ChatGrok 4
LMArena Text13891411
LMArena Creative Writing13551397
LMArena Multi-Turn14121416
Short-Story Creative Writing—76.9%
EQ-Bench Creative Writing1690—
WildBench—79.7%

Frequently asked questions

Is GPT-5.3 Chat better than Grok 4?

Grok 4 is the stronger model overall, scoring 48.1 to 42.8 on the Noometry Index.

Is GPT-5.3 Chat or Grok 4 better for coding?

Grok 4 scores higher on coding benchmarks: 50.3 versus 41.4 in the Noometry coding category.

How many benchmarks do GPT-5.3 Chat and Grok 4 share?

17 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Grok 4 has 48.

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