Noometry

Model comparison

Claude 3 Opus vs GPT-5.5 Instant

GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 29.5 on the Noometry Index.

Last verified . 22 shared benchmarks.

Claude 3 Opus Anthropic

29.5

Rank #310 Confirmed

GPT-5.5 Instant OpenAI

42.7

Rank #110 Confirmed

Summary

  • They share 22 benchmarks with published results for both. Claude 3 Opus scores higher in 0 categories and GPT-5.5 Instant in 9 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where GPT-5.5 Instant leads 48.9 to 24.5.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 4.7% for Claude 3 Opus and 68.1% for GPT-5.5 Instant.

Side by side

Claude 3 OpusGPT-5.5 Instant
ProviderAnthropicOpenAI
Noometry Index29.542.7
Released2024-02-292026-05-05
WeightsProprietaryProprietary
Context window——
Max output——
Input $ / M tokens——
Output $ / M tokens——
Results tracked4627

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Category by category

Coding GPT-5.5 Instant leads

Claude 3 Opus: 32.9 (#267), GPT-5.5 Instant: 44.3 (#74)

BenchmarkClaude 3 OpusGPT-5.5 Instant
LMArena Coding12641433
SciCode—48.6%
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-5.5 Instant: —

BenchmarkClaude 3 OpusGPT-5.5 Instant
Cybench10%—
METR Time Horizons29.5%—

Reasoning GPT-5.5 Instant leads

Claude 3 Opus: 14.6 (#324), GPT-5.5 Instant: 24.9 (#155)

BenchmarkClaude 3 OpusGPT-5.5 Instant
Chess Puzzles5%12%
LMArena Hard Prompts12451426
Epoch Capabilities Index126.91142.52
SimpleBench23.5%—
CritPt—0%
EnigmaEval0.8%—
LiveBench Reasoning40.6%—
DTBench61.6%—
LiveBench Data Analysis57.9%—
LMCA17%—
ForecastBench58.4—
LiveBench49.2%—
WinoGrande88.5%—

Math GPT-5.5 Instant leads

Claude 3 Opus: 14.8 (#299), GPT-5.5 Instant: 26.5 (#259)

BenchmarkClaude 3 OpusGPT-5.5 Instant
OTIS Mock AIME 2024-20254.7%68.1%
LMArena Math12731420
FrontierMath (Tiers 1-3)—26.3%
FrontierMath Tier 4—2.4%
LiveBench Math43.6%—
MATH Level 537.5%—

Knowledge GPT-5.5 Instant leads

Claude 3 Opus: 24.5 (#267), GPT-5.5 Instant: 48.9 (#74)

BenchmarkClaude 3 OpusGPT-5.5 Instant
GPQA Diamond47.2%82.5%
LMArena Expert12231409
SimpleQA Verified12.6%—
Confabulations22.7%—
MMLU84.6%—

Multimodal GPT-5.5 Instant leads

Claude 3 Opus: 27.1 (#116), GPT-5.5 Instant: 40.0 (#52)

BenchmarkClaude 3 OpusGPT-5.5 Instant
LMArena Vision10231250
LMArena Document—1403

Multilingual GPT-5.5 Instant leads

Claude 3 Opus: 41.4 (#207), GPT-5.5 Instant: 52.8 (#80)

BenchmarkClaude 3 OpusGPT-5.5 Instant
LMArena Non-English12581417
LMArena Chinese12481456
LMArena French12751428
LMArena German12581411
LMArena Japanese12041408
LMArena Korean11871392
LMArena Russian12801431
LMArena Spanish12461429

Instruction Following GPT-5.5 Instant leads

Claude 3 Opus: 64.1 (#228), GPT-5.5 Instant: 74.2 (#100)

BenchmarkClaude 3 OpusGPT-5.5 Instant
LMArena Instruction Following12481406
LiveBench Instruction Following63.9%—

Long Context GPT-5.5 Instant leads

Claude 3 Opus: 38.2 (#202), GPT-5.5 Instant: 43.4 (#96)

BenchmarkClaude 3 OpusGPT-5.5 Instant
LMArena Longer Query12591422

Writing & Preference GPT-5.5 Instant leads

Claude 3 Opus: 47.2 (#213), GPT-5.5 Instant: 61.8 (#85)

BenchmarkClaude 3 OpusGPT-5.5 Instant
LMArena Text12621419
LMArena Creative Writing12351419
LMArena Multi-Turn12751433
LiveBench Language50.4%—

Frequently asked questions

Is Claude 3 Opus better than GPT-5.5 Instant?

GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 29.5 on the Noometry Index.

Is Claude 3 Opus or GPT-5.5 Instant better for coding?

GPT-5.5 Instant scores higher on coding benchmarks: 44.3 versus 32.9 in the Noometry coding category.

How many benchmarks do Claude 3 Opus and GPT-5.5 Instant share?

22 benchmarks have published results for both models. Claude 3 Opus has 46 scored results on Noometry and GPT-5.5 Instant has 27.

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