Noometry

Model comparison

Claude 3 Opus vs GPT-5.5 Pro

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 29.5 on the Noometry Index.

Last verified . 7 shared benchmarks.

Claude 3 Opus Anthropic

29.5

Rank #310 Confirmed

GPT-5.5 Pro OpenAI

64.3

Rank #8 Confirmed

Summary

  • They share 7 benchmarks with published results for both. Claude 3 Opus scores higher in 0 categories and GPT-5.5 Pro in 3 categories; 3 gaps are clear of the uncertainty.
  • The widest gap is in math, where GPT-5.5 Pro leads 84.0 to 14.8.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 4.7% for Claude 3 Opus and 100% for GPT-5.5 Pro.

Side by side

Claude 3 OpusGPT-5.5 Pro
ProviderAnthropicOpenAI
Noometry Index29.564.3
Released2024-02-292026-04-23
WeightsProprietaryProprietary
Context window—1.05M
Max output—128K
Input $ / M tokens—$30
Output $ / M tokens—$180
Results tracked4614

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Category by category

Coding Not comparable

Claude 3 Opus: 32.9 (#267), GPT-5.5 Pro: —

BenchmarkClaude 3 OpusGPT-5.5 Pro
WeirdML19.2%—
BigCodeBench Instruct45.5%—
LiveBench Coding38.6%—
LMArena Coding1264—
BigCodeBench Complete57.4%—
HumanEval+77.4%—
MBPP+73.3%—

Agentic & Tool Use Not comparable

Claude 3 Opus: 24.6 (#116), GPT-5.5 Pro: —

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

Reasoning GPT-5.5 Pro leads

Claude 3 Opus: 14.6 (#324), GPT-5.5 Pro: 73.3 (#10)

BenchmarkClaude 3 OpusGPT-5.5 Pro
SimpleBench23.5%76.9%
Chess Puzzles5%64%
DTBench61.6%96%
LMCA17%53.9%
Epoch Capabilities Index126.91162.07
ARC-AGI-2—84.6%
ARC-AGI-1—96.5%
CritPt—30.6%
EnigmaEval0.8%—
LiveBench Reasoning40.6%—
LMArena Hard Prompts1245—
LiveBench Data Analysis57.9%—
ForecastBench58.4—
LiveBench49.2%—
WinoGrande88.5%—

Math GPT-5.5 Pro leads

Claude 3 Opus: 14.8 (#299), GPT-5.5 Pro: 84.0 (#10)

BenchmarkClaude 3 OpusGPT-5.5 Pro
OTIS Mock AIME 2024-20254.7%100%
FrontierMath (Tiers 1-3)—87.7%
FrontierMath Tier 4—78%
LiveBench Math43.6%—
LMArena Math1273—
MATH Level 537.5%—
FrontierMath (Feb 2025 set)—52.4%
FrontierMath Tier 4 (v1)—39.6%

Knowledge GPT-5.5 Pro leads

Claude 3 Opus: 24.5 (#267), GPT-5.5 Pro: 64.1 (#19)

BenchmarkClaude 3 OpusGPT-5.5 Pro
GPQA Diamond47.2%93.9%
SimpleQA Verified12.6%—
Confabulations22.7%—
LMArena Expert1223—
MMLU84.6%—

Multimodal Not comparable

Claude 3 Opus: 27.1 (#116), GPT-5.5 Pro: —

BenchmarkClaude 3 OpusGPT-5.5 Pro
LMArena Vision1023—

Multilingual Not comparable

Claude 3 Opus: 41.4 (#207), GPT-5.5 Pro: —

BenchmarkClaude 3 OpusGPT-5.5 Pro
LMArena Non-English1258—
LMArena Chinese1248—
LMArena French1275—
LMArena German1258—
LMArena Japanese1204—
LMArena Korean1187—
LMArena Russian1280—
LMArena Spanish1246—

Instruction Following Not comparable

Claude 3 Opus: 64.1 (#228), GPT-5.5 Pro: —

BenchmarkClaude 3 OpusGPT-5.5 Pro
LiveBench Instruction Following63.9%—
LMArena Instruction Following1248—

Long Context Not comparable

Claude 3 Opus: 38.2 (#202), GPT-5.5 Pro: —

BenchmarkClaude 3 OpusGPT-5.5 Pro
LMArena Longer Query1259—

Writing & Preference Not comparable

Claude 3 Opus: 47.2 (#213), GPT-5.5 Pro: —

BenchmarkClaude 3 OpusGPT-5.5 Pro
LMArena Text1262—
LMArena Creative Writing1235—
LMArena Multi-Turn1275—
LiveBench Language50.4%—

Frequently asked questions

Is Claude 3 Opus better than GPT-5.5 Pro?

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 29.5 on the Noometry Index.

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

7 benchmarks have published results for both models. Claude 3 Opus has 46 scored results on Noometry and GPT-5.5 Pro has 14.

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