Noometry

Model comparison

Claude Opus 5.5 vs GPT-4

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 29.1 on the Noometry Index.

Last verified . 21 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

GPT-4 OpenAI

29.1

Rank #316 Confirmed

Summary

  • They share 21 benchmarks with published results for both. Claude Opus 5.5 scores higher in 8 categories and GPT-4 in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Opus 5.5 leads 91.8 to 10.8.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Opus 5.5 and 1.1% for GPT-4.
  • Claude Opus 5.5 is cheaper at $4 / $20 per million input/output tokens, against $30 / $60 for GPT-4.
  • Claude Opus 5.5 accepts more context: 1M tokens versus 8K.

Side by side

Claude Opus 5.5GPT-4
ProviderAnthropicOpenAI
Noometry Index68.629.1
Released2026-09-222023-03-14
WeightsProprietaryProprietary
Context window1M8K
Max output128K8K
Input $ / M tokens$4$30
Output $ / M tokens$20$60
Results tracked4438

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), GPT-4: 31.6 (#283)

BenchmarkClaude Opus 5.5GPT-4
LMArena Coding15471254
FrontierCode54.6%—
CursorBench57.8%—
LMArena WebDev1813—
FrontierSWE62.3%—
SciCode66.9%—
WeirdML—12.4%
BigCodeBench Instruct—46%
MirrorCode77.4%—
BigCodeBench Complete—57.2%
ALE-Bench2,147—
HumanEval+—79.3%

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#15), GPT-4: —

BenchmarkClaude Opus 5.5GPT-4
APEX-Agents73.5%—
GDP.pdf30.6%—
METR Time Horizons—36.1%
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), GPT-4: 17.8 (#289)

BenchmarkClaude Opus 5.5GPT-4
LMArena Hard Prompts15351241
Mystery Game Puzzles71%12%
DTBench98.9%62.7%
LMCA68.2%17.1%
Epoch Capabilities Index167.33125.89
ARC-AGI-293.3%—
NYT Connections (extended)88.5%—
ARC-AGI-198.5%—
CritPt31.7%—
Chess Puzzles—4%
EBR-Bench71.4%—
BIG-Bench Hard—75.1%
ForecastBench—57.8
HellaSwag—95.3%
WinoGrande—87.5%

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), GPT-4: 10.8 (#309)

BenchmarkClaude Opus 5.5GPT-4
OTIS Mock AIME 2024-2025100%1.1%
LMArena Math15061269
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
ProofBench100%—
MATH Level 5—23%
FrontierMath Erdős2.9%—
GSM8K—92%

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), GPT-4: 18.4 (#282)

BenchmarkClaude Opus 5.5GPT-4
GPQA Diamond90.6%35.7%
LMArena Expert15471211
SimpleQA Verified72.2%—
MMLU—86.4%
TriviaQA—84.8%

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), GPT-4: —

BenchmarkClaude Opus 5.5GPT-4
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.1 (#2), GPT-4: 40.6 (#215)

BenchmarkClaude Opus 5.5GPT-4
LMArena Non-English15071246
LMArena Chinese15881242
LMArena French15141283
LMArena Russian15201251
LMArena Spanish15071261
LMArena German—1251
LMArena Japanese—1209
LMArena Korean—1184

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.0 (#3), GPT-4: 65.3 (#222)

BenchmarkClaude Opus 5.5GPT-4
LMArena Instruction Following15371241

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.1 (#19), GPT-4: 37.7 (#212)

BenchmarkClaude Opus 5.5GPT-4
LMArena Longer Query15321244

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), GPT-4: 34.9 (#268)

BenchmarkClaude Opus 5.5GPT-4
LMArena Text15151263
LMArena Creative Writing15331244
EQ-Bench Creative Writing2050752
LMArena Multi-Turn14991257

Frequently asked questions

Is Claude Opus 5.5 better than GPT-4?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 29.1 on the Noometry Index.

Which is cheaper, Claude Opus 5.5 or GPT-4?

Claude Opus 5.5 is cheaper. It lists at $4 per million input tokens and $20 per million output tokens; GPT-4 lists at $30 and $60.

Is Claude Opus 5.5 or GPT-4 better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 31.6 in the Noometry coding category.

Which has the bigger context window?

Claude Opus 5.5 does, with 1M tokens against 8K.

How many benchmarks do Claude Opus 5.5 and GPT-4 share?

21 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and GPT-4 has 38.

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