Noometry

Model comparison

Claude 3 Opus vs GPT-5.3 Chat

GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 29.5 on the Noometry Index.

Last verified . 17 shared benchmarks.

Claude 3 Opus Anthropic

29.5

Rank #310 Confirmed

GPT-5.3 Chat OpenAI

42.8

Rank #109 Confirmed

Summary

  • They share 17 benchmarks with published results for both. Claude 3 Opus scores higher in 0 categories and GPT-5.3 Chat in 8 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where GPT-5.3 Chat leads 38.2 to 14.8.

Side by side

Claude 3 OpusGPT-5.3 Chat
ProviderAnthropicOpenAI
Noometry Index29.542.8
Released2024-02-292026-03-03
WeightsProprietaryProprietary
Context window—128K
Max output—16K
Input $ / M tokens—$1.75
Output $ / M tokens—$14
Results tracked4618

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Category by category

Coding GPT-5.3 Chat leads

Claude 3 Opus: 32.9 (#267), GPT-5.3 Chat: 41.4 (#124)

BenchmarkClaude 3 OpusGPT-5.3 Chat
LMArena Coding12641408
WeirdML19.2%—
BigCodeBench Instruct45.5%—
LiveBench Coding38.6%—
BigCodeBench Complete57.4%—
HumanEval+77.4%—
MBPP+73.3%—

Agentic & Tool Use Not comparable

Claude 3 Opus: 24.6 (#116), GPT-5.3 Chat: —

BenchmarkClaude 3 OpusGPT-5.3 Chat
Cybench10%—
METR Time Horizons29.5%—

Reasoning GPT-5.3 Chat leads

Claude 3 Opus: 14.6 (#324), GPT-5.3 Chat: 28.5 (#102)

BenchmarkClaude 3 OpusGPT-5.3 Chat
LMArena Hard Prompts12451399
SimpleBench23.5%—
Chess Puzzles5%—
EnigmaEval0.8%—
LiveBench Reasoning40.6%—
DTBench61.6%—
LiveBench Data Analysis57.9%—
LMCA17%—
Epoch Capabilities Index126.91—
ForecastBench58.4—
LiveBench49.2%—
WinoGrande88.5%—

Math GPT-5.3 Chat leads

Claude 3 Opus: 14.8 (#299), GPT-5.3 Chat: 38.2 (#142)

BenchmarkClaude 3 OpusGPT-5.3 Chat
LMArena Math12731389
OTIS Mock AIME 2024-20254.7%—
LiveBench Math43.6%—
MATH Level 537.5%—

Knowledge GPT-5.3 Chat leads

Claude 3 Opus: 24.5 (#267), GPT-5.3 Chat: 38.8 (#140)

BenchmarkClaude 3 OpusGPT-5.3 Chat
LMArena Expert12231397
GPQA Diamond47.2%—
SimpleQA Verified12.6%—
Confabulations22.7%—
MMLU84.6%—

Multimodal Not comparable

Claude 3 Opus: 27.1 (#116), GPT-5.3 Chat: —

BenchmarkClaude 3 OpusGPT-5.3 Chat
LMArena Vision1023—

Multilingual GPT-5.3 Chat leads

Claude 3 Opus: 41.4 (#207), GPT-5.3 Chat: 50.3 (#124)

BenchmarkClaude 3 OpusGPT-5.3 Chat
LMArena Non-English12581382
LMArena Chinese12481432
LMArena French12751397
LMArena German12581384
LMArena Japanese12041352
LMArena Korean11871346
LMArena Russian12801400
LMArena Spanish12461371

Instruction Following GPT-5.3 Chat leads

Claude 3 Opus: 64.1 (#228), GPT-5.3 Chat: 72.8 (#129)

BenchmarkClaude 3 OpusGPT-5.3 Chat
LMArena Instruction Following12481378
LiveBench Instruction Following63.9%—

Long Context GPT-5.3 Chat leads

Claude 3 Opus: 38.2 (#202), GPT-5.3 Chat: 42.6 (#120)

BenchmarkClaude 3 OpusGPT-5.3 Chat
LMArena Longer Query12591396

Writing & Preference GPT-5.3 Chat leads

Claude 3 Opus: 47.2 (#213), GPT-5.3 Chat: 63.1 (#68)

BenchmarkClaude 3 OpusGPT-5.3 Chat
LMArena Text12621389
LMArena Creative Writing12351355
LMArena Multi-Turn12751412
EQ-Bench Creative Writing—1690
LiveBench Language50.4%—

Frequently asked questions

Is Claude 3 Opus better than GPT-5.3 Chat?

GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 29.5 on the Noometry Index.

Is Claude 3 Opus or GPT-5.3 Chat better for coding?

GPT-5.3 Chat scores higher on coding benchmarks: 41.4 versus 32.9 in the Noometry coding category.

How many benchmarks do Claude 3 Opus and GPT-5.3 Chat share?

17 benchmarks have published results for both models. Claude 3 Opus has 46 scored results on Noometry and GPT-5.3 Chat has 18.

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