Noometry

Model comparison

GPT-5.3 Chat vs Grok 4.6

Grok 4.6 is the stronger model overall, scoring 56.9 to 42.8 on the Noometry Index.

Last verified . 17 shared benchmarks.

GPT-5.3 Chat OpenAI

42.8

Rank #109 Confirmed

Grok 4.6 xAI

56.9

Rank #21 Confirmed

Summary

  • They share 17 benchmarks with published results for both. GPT-5.3 Chat scores higher in 1 category and Grok 4.6 in 7 categories; 7 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Grok 4.6 leads 61.4 to 28.5.
  • Grok 4.6 is cheaper at $2 / $6 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
  • Grok 4.6 accepts more context: 500K tokens versus 128K.

Side by side

GPT-5.3 ChatGrok 4.6
ProviderOpenAIxAI
Noometry Index42.856.9
Released2026-03-032026-08-12
WeightsProprietaryProprietary
Context window128K500K
Max output16K500K
Input $ / M tokens$1.75$2
Output $ / M tokens$14$6
Results tracked1849

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Category by category

Coding Grok 4.6 leads

GPT-5.3 Chat: 41.4 (#124), Grok 4.6: 58.5 (#16)

BenchmarkGPT-5.3 ChatGrok 4.6
LMArena Coding14081465
DeepSWE—67.5%
FrontierCode—48%
CursorBench—41.4%
LMArena WebDev—1617
FrontierSWE—25.3%
SciCode—56.5%
WeirdML—67.3%
ALE-Bench—1,508

Agentic & Tool Use Not comparable

GPT-5.3 Chat: —, Grok 4.6: 39.4 (#27)

BenchmarkGPT-5.3 ChatGrok 4.6
APEX-Agents—65.3%
GDP.pdf—17.2%
Vending-Bench 2—9,047

Reasoning Grok 4.6 leads

GPT-5.3 Chat: 28.5 (#102), Grok 4.6: 61.4 (#20)

BenchmarkGPT-5.3 ChatGrok 4.6
LMArena Hard Prompts13991447
ARC-AGI-2—67.1%
SimpleBench—75.9%
NYT Connections (extended)—80%
ARC-AGI-1—87.5%
CritPt—19.7%
Chess Puzzles—40%
EBR-Bench—30.5%
Mystery Game Puzzles—34%
DTBench—97.3%
LMCA—48.5%
Epoch Capabilities Index—156.44

Math Grok 4.6 leads

GPT-5.3 Chat: 38.2 (#142), Grok 4.6: 67.0 (#24)

BenchmarkGPT-5.3 ChatGrok 4.6
LMArena Math13891423
FrontierMath (Tiers 1-3)—66%
FrontierMath Tier 4—31.7%
OTIS Mock AIME 2024-2025—99.2%
ProofBench—51%

Knowledge Grok 4.6 leads

GPT-5.3 Chat: 38.8 (#140), Grok 4.6: 63.3 (#20)

BenchmarkGPT-5.3 ChatGrok 4.6
LMArena Expert13971467
GPQA Diamond—94%
SimpleQA Verified—49.3%

Multimodal Not comparable

GPT-5.3 Chat: —, Grok 4.6: 43.6 (#23)

BenchmarkGPT-5.3 ChatGrok 4.6
LMArena Vision—1263
Blueprint-Bench 2—33.2%
Furniture Assembly—40%
LMArena Document—1452

Multilingual Grok 4.6 leads

GPT-5.3 Chat: 50.3 (#124), Grok 4.6: 53.0 (#74)

BenchmarkGPT-5.3 ChatGrok 4.6
LMArena Non-English13821420
LMArena Chinese14321480
LMArena French13971461
LMArena German13841431
LMArena Japanese13521376
LMArena Korean13461397
LMArena Russian14001422
LMArena Spanish13711404

Instruction Following Grok 4.6 leads

GPT-5.3 Chat: 72.8 (#129), Grok 4.6: 75.4 (#63)

BenchmarkGPT-5.3 ChatGrok 4.6
LMArena Instruction Following13781431

Long Context Grok 4.6 leads

GPT-5.3 Chat: 42.6 (#120), Grok 4.6: 44.5 (#66)

BenchmarkGPT-5.3 ChatGrok 4.6
LMArena Longer Query13961454

Writing & Preference Too close to call

GPT-5.3 Chat: 63.1 (#68), Grok 4.6: 62.3 (#80)

BenchmarkGPT-5.3 ChatGrok 4.6
LMArena Text13891428
LMArena Creative Writing13551428
LMArena Multi-Turn14121425
EQ-Bench Creative Writing1690—

Frequently asked questions

Is GPT-5.3 Chat better than Grok 4.6?

Grok 4.6 is the stronger model overall, scoring 56.9 to 42.8 on the Noometry Index.

Which is cheaper, GPT-5.3 Chat or Grok 4.6?

Grok 4.6 is cheaper. It lists at $2 per million input tokens and $6 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.

Is GPT-5.3 Chat or Grok 4.6 better for coding?

Grok 4.6 scores higher on coding benchmarks: 58.5 versus 41.4 in the Noometry coding category.

Which has the bigger context window?

Grok 4.6 does, with 500K tokens against 128K.

How many benchmarks do GPT-5.3 Chat and Grok 4.6 share?

17 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Grok 4.6 has 49.

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