Noometry

Model comparison

Claude Opus 4.1 vs GPT-5.3 Chat

GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 41.0 on the Noometry Index.

Last verified . 17 shared benchmarks.

Claude Opus 4.1 Anthropic

41.0

Rank #142 Confirmed

GPT-5.3 Chat OpenAI

42.8

Rank #109 Confirmed

Summary

  • They share 17 benchmarks with published results for both. Claude Opus 4.1 scores higher in 6 categories and GPT-5.3 Chat in 2 categories; 7 gaps are clear of the uncertainty.
  • The widest gap is in math, where GPT-5.3 Chat leads 38.2 to 22.3.
  • GPT-5.3 Chat is cheaper at $1.75 / $14 per million input/output tokens, against $15 / $75 for Claude Opus 4.1.
  • Claude Opus 4.1 accepts more context: 200K tokens versus 128K.

Side by side

Claude Opus 4.1GPT-5.3 Chat
ProviderAnthropicOpenAI
Noometry Index41.042.8
Released2025-08-052026-03-03
WeightsProprietaryProprietary
Context window200K128K
Max output32K16K
Input $ / M tokens$15$1.75
Output $ / M tokens$75$14
Results tracked4818

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Category by category

Coding Claude Opus 4.1 leads

Claude Opus 4.1: 44.4 (#73), GPT-5.3 Chat: 41.4 (#124)

BenchmarkClaude Opus 4.1GPT-5.3 Chat
LMArena Coding14791408
SWE-bench Verified73.3%—
LMArena WebDev1390—
WeirdML45.9%—
ALE-Bench674.77—
AlgoTune1.34—

Agentic & Tool Use Not comparable

Claude Opus 4.1: 35.0 (#41), GPT-5.3 Chat: —

BenchmarkClaude Opus 4.1GPT-5.3 Chat
Terminal-Bench38%—
GDPval43.6%—
Cybench42%—
DeepResearch Bench48.3%—
LMArena Search1148—
METR Time Horizons66.8%—

Reasoning Claude Opus 4.1 leads

Claude Opus 4.1: 32.2 (#76), GPT-5.3 Chat: 28.5 (#102)

BenchmarkClaude Opus 4.1GPT-5.3 Chat
LMArena Hard Prompts14431399
SimpleBench60%—
Chess Puzzles7%—
EnigmaEval7.2%—
EBR-Bench7.9%—
Mystery Game Puzzles21%—
DTBench80%—
LMCA37.1%—
Epoch Capabilities Index144.12—
ForecastBench62—

Math GPT-5.3 Chat leads

Claude Opus 4.1: 22.3 (#277), GPT-5.3 Chat: 38.2 (#142)

BenchmarkClaude Opus 4.1GPT-5.3 Chat
LMArena Math14311389
FrontierMath (Tiers 1-3)12.6%—
FrontierMath Tier 42.4%—
OTIS Mock AIME 2024-202568.9%—
FrontierMath (Feb 2025 set)7.2%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Claude Opus 4.1 leads

Claude Opus 4.1: 42.0 (#101), GPT-5.3 Chat: 38.8 (#140)

BenchmarkClaude Opus 4.1GPT-5.3 Chat
LMArena Expert14391397
GPQA Diamond77.3%—
Humanity's Last Exam11.5%—
Confabulations17.1%—
Vectara Hallucination Rate11.8%—

Multimodal Not comparable

Claude Opus 4.1: 26.8 (#119), GPT-5.3 Chat: —

BenchmarkClaude Opus 4.1GPT-5.3 Chat
VPCT35%—

Multilingual Claude Opus 4.1 leads

Claude Opus 4.1: 52.0 (#95), GPT-5.3 Chat: 50.3 (#124)

BenchmarkClaude Opus 4.1GPT-5.3 Chat
LMArena Non-English14051382
LMArena Chinese14271432
LMArena French14311397
LMArena German14131384
LMArena Japanese13781352
LMArena Korean13801346
LMArena Russian14221400
LMArena Spanish14481371

Instruction Following Claude Opus 4.1 leads

Claude Opus 4.1: 75.6 (#58), GPT-5.3 Chat: 72.8 (#129)

BenchmarkClaude Opus 4.1GPT-5.3 Chat
LMArena Instruction Following14351378

Long Context Claude Opus 4.1 leads

Claude Opus 4.1: 44.5 (#63), GPT-5.3 Chat: 42.6 (#120)

BenchmarkClaude Opus 4.1GPT-5.3 Chat
LMArena Longer Query14551396

Writing & Preference Too close to call

Claude Opus 4.1: 62.4 (#74), GPT-5.3 Chat: 63.1 (#68)

BenchmarkClaude Opus 4.1GPT-5.3 Chat
LMArena Text14191389
LMArena Creative Writing14121355
LMArena Multi-Turn14441412
Short-Story Creative Writing84.7%—
EQ-Bench Creative Writing—1690

Frequently asked questions

Is Claude Opus 4.1 better than GPT-5.3 Chat?

GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 41.0 on the Noometry Index.

Which is cheaper, Claude Opus 4.1 or GPT-5.3 Chat?

GPT-5.3 Chat is cheaper. It lists at $1.75 per million input tokens and $14 per million output tokens; Claude Opus 4.1 lists at $15 and $75.

Is Claude Opus 4.1 or GPT-5.3 Chat better for coding?

Claude Opus 4.1 scores higher on coding benchmarks: 44.4 versus 41.4 in the Noometry coding category.

Which has the bigger context window?

Claude Opus 4.1 does, with 200K tokens against 128K.

How many benchmarks do Claude Opus 4.1 and GPT-5.3 Chat share?

17 benchmarks have published results for both models. Claude Opus 4.1 has 48 scored results on Noometry and GPT-5.3 Chat has 18.

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