Noometry

Model comparison

Claude 3 Sonnet vs GPT-5.5 Instant

GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 29.0 on the Noometry Index.

Last verified . 21 shared benchmarks.

Claude 3 Sonnet Anthropic

29.0

Rank #319 Confirmed

GPT-5.5 Instant OpenAI

42.7

Rank #110 Confirmed

Summary

  • They share 21 benchmarks with published results for both. Claude 3 Sonnet 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 21.1.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 2.5% for Claude 3 Sonnet and 68.1% for GPT-5.5 Instant.

Side by side

Claude 3 SonnetGPT-5.5 Instant
ProviderAnthropicOpenAI
Noometry Index29.042.7
Released2024-02-292026-05-05
WeightsProprietaryProprietary
Context window——
Max output——
Input $ / M tokens——
Output $ / M tokens——
Results tracked3027

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Category by category

Coding GPT-5.5 Instant leads

Claude 3 Sonnet: 29.6 (#302), GPT-5.5 Instant: 44.3 (#74)

BenchmarkClaude 3 SonnetGPT-5.5 Instant
LMArena Coding12231433
SciCode—48.6%
WeirdML10.2%—
BigCodeBench Instruct42.7%—
BigCodeBench Complete53.8%—
HumanEval+64%—
MBPP+69.3%—

Reasoning GPT-5.5 Instant leads

Claude 3 Sonnet: 20.5 (#237), GPT-5.5 Instant: 24.9 (#155)

BenchmarkClaude 3 SonnetGPT-5.5 Instant
LMArena Hard Prompts11971426
Epoch Capabilities Index120.7142.52
CritPt—0%
Chess Puzzles—12%
DTBench53.6%—
WinoGrande75.1%—

Math GPT-5.5 Instant leads

Claude 3 Sonnet: 10.7 (#310), GPT-5.5 Instant: 26.5 (#259)

BenchmarkClaude 3 SonnetGPT-5.5 Instant
OTIS Mock AIME 2024-20252.5%68.1%
LMArena Math12131420
FrontierMath (Tiers 1-3)—26.3%
FrontierMath Tier 4—2.4%
MATH Level 518.2%—

Knowledge GPT-5.5 Instant leads

Claude 3 Sonnet: 21.1 (#276), GPT-5.5 Instant: 48.9 (#74)

BenchmarkClaude 3 SonnetGPT-5.5 Instant
GPQA Diamond40.6%82.5%
LMArena Expert11731409
MMLU75.9%—

Multimodal GPT-5.5 Instant leads

Claude 3 Sonnet: 25.2 (#125), GPT-5.5 Instant: 40.0 (#52)

BenchmarkClaude 3 SonnetGPT-5.5 Instant
LMArena Vision9841250
LMArena Document—1403

Multilingual GPT-5.5 Instant leads

Claude 3 Sonnet: 37.8 (#234), GPT-5.5 Instant: 52.8 (#80)

BenchmarkClaude 3 SonnetGPT-5.5 Instant
LMArena Non-English12051417
LMArena Chinese11891456
LMArena French12291428
LMArena German12041411
LMArena Japanese11311408
LMArena Korean11281392
LMArena Russian12271431
LMArena Spanish12041429

Instruction Following GPT-5.5 Instant leads

Claude 3 Sonnet: 62.8 (#235), GPT-5.5 Instant: 74.2 (#100)

BenchmarkClaude 3 SonnetGPT-5.5 Instant
LMArena Instruction Following11991406

Long Context GPT-5.5 Instant leads

Claude 3 Sonnet: 36.7 (#228), GPT-5.5 Instant: 43.4 (#96)

BenchmarkClaude 3 SonnetGPT-5.5 Instant
LMArena Longer Query12111422

Writing & Preference GPT-5.5 Instant leads

Claude 3 Sonnet: 42.1 (#238), GPT-5.5 Instant: 61.8 (#85)

BenchmarkClaude 3 SonnetGPT-5.5 Instant
LMArena Text12181419
LMArena Creative Writing11861419
LMArena Multi-Turn12271433

Frequently asked questions

Is Claude 3 Sonnet better than GPT-5.5 Instant?

GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 29.0 on the Noometry Index.

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

GPT-5.5 Instant scores higher on coding benchmarks: 44.3 versus 29.6 in the Noometry coding category.

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

21 benchmarks have published results for both models. Claude 3 Sonnet has 30 scored results on Noometry and GPT-5.5 Instant has 27.

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