Noometry

Model comparison

Claude Opus 5.5 vs GPT-5.4 Pro

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 58.8 on the Noometry Index.

Last verified . 7 shared benchmarks.

Claude Opus 5.5 Anthropic

68.5

Rank #3 Confirmed

GPT-5.4 Pro OpenAI

58.8

Rank #16 Confirmed

Summary

  • They share 7 benchmarks with published results for both. Claude Opus 5.5 scores higher in 3 categories and GPT-5.4 Pro in 1 category; 4 gaps are clear of the uncertainty.
  • The widest gap is in coding, where Claude Opus 5.5 leads 71.4 to 42.6.
  • The biggest single-benchmark swing is FrontierMath Tier 4: 95% for Claude Opus 5.5 and 58.5% for GPT-5.4 Pro.
  • Claude Opus 5.5 is cheaper at $4 / $20 per million input/output tokens, against $30 / $180 for GPT-5.4 Pro.
  • GPT-5.4 Pro accepts more context: 1.05M tokens versus 1M.

Side by side

Claude Opus 5.5GPT-5.4 Pro
ProviderAnthropicOpenAI
Noometry Index68.558.8
Released2026-09-222026-03-05
WeightsProprietaryProprietary
Context window1M1.05M
Max output128K128K
Input $ / M tokens$4$30
Output $ / M tokens$20$180
Results tracked3516

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.4 (#1), GPT-5.4 Pro: 42.6 (#89)

BenchmarkClaude Opus 5.5GPT-5.4 Pro
FrontierCode54.4%—
CursorBench57.8%—
LMArena WebDev1820—
FrontierSWE62.3%—
SciCode66.9%—
WeirdML—57.4%
LMArena Coding1545—
MirrorCode77.4%—

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#13), GPT-5.4 Pro: —

BenchmarkClaude Opus 5.5GPT-5.4 Pro
APEX-Agents73.5%—
GDP.pdf30.6%—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 79.5 (#2), GPT-5.4 Pro: 71.0 (#10)

BenchmarkClaude Opus 5.5GPT-5.4 Pro
ARC-AGI-292.5%83.3%
ARC-AGI-197.5%94.5%
CritPt31.7%30%
SimpleBench—74.1%
NYT Connections (extended)88.5%—
Chess Puzzles—58.6%
EnigmaEval—23.8%
EBR-Bench71.4%—
LMArena Hard Prompts1545—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—
Epoch Capabilities Index—159.12

Math Claude Opus 5.5 leads

Claude Opus 5.5: 92.4 (#2), GPT-5.4 Pro: 72.0 (#17)

BenchmarkClaude Opus 5.5GPT-5.4 Pro
FrontierMath (Tiers 1-3)91.2%82.5%
FrontierMath Tier 495%58.5%
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
FrontierMath (Feb 2025 set)—50%
FrontierMath Tier 4 (v1)—37.5%

Knowledge GPT-5.4 Pro leads

Claude Opus 5.5: 66.6 (#9), GPT-5.4 Pro: 68.3 (#6)

BenchmarkClaude Opus 5.5GPT-5.4 Pro
GPQA Diamond90.6%94.6%
SimpleQA Verified72.2%46.3%
Humanity's Last Exam—44.3%
Vectara Hallucination Rate—8.3%
LMArena Expert1564—

Multimodal Not comparable

Claude Opus 5.5: 56.5 (#2), GPT-5.4 Pro: —

BenchmarkClaude Opus 5.5GPT-5.4 Pro
Furniture Assembly83.3%—

Multilingual Not comparable

Claude Opus 5.5: 59.8 (#1), GPT-5.4 Pro: —

BenchmarkClaude Opus 5.5GPT-5.4 Pro
LMArena Non-English1513—
LMArena Chinese1572—
LMArena Russian1532—

Instruction Following Not comparable

Claude Opus 5.5: 80.1 (#2), GPT-5.4 Pro: —

BenchmarkClaude Opus 5.5GPT-5.4 Pro
LMArena Instruction Following1535—

Long Context Not comparable

Claude Opus 5.5: 47.3 (#18), GPT-5.4 Pro: —

BenchmarkClaude Opus 5.5GPT-5.4 Pro
LMArena Longer Query1540—

Writing & Preference Not comparable

Claude Opus 5.5: 78.7 (#3), GPT-5.4 Pro: —

BenchmarkClaude Opus 5.5GPT-5.4 Pro
LMArena Text1518—
LMArena Creative Writing1538—
EQ-Bench Creative Writing2050—
LMArena Multi-Turn1520—

Frequently asked questions

Is Claude Opus 5.5 better than GPT-5.4 Pro?

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 58.8 on the Noometry Index.

Which is cheaper, Claude Opus 5.5 or GPT-5.4 Pro?

Claude Opus 5.5 is cheaper. It lists at $4 per million input tokens and $20 per million output tokens; GPT-5.4 Pro lists at $30 and $180.

Is Claude Opus 5.5 or GPT-5.4 Pro better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.4 versus 42.6 in the Noometry coding category.

Which has the bigger context window?

GPT-5.4 Pro does, with 1.05M tokens against 1M.

How many benchmarks do Claude Opus 5.5 and GPT-5.4 Pro share?

7 benchmarks have published results for both models. Claude Opus 5.5 has 35 scored results on Noometry and GPT-5.4 Pro has 16.

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