Noometry

Model comparison

Claude Sonnet 4.6 vs GPT-5.3 Chat

Claude Sonnet 4.6 is the stronger model overall, scoring 50.1 to 42.1 on the Noometry Index.

Last verified . 18 shared benchmarks.

Claude Sonnet 4.6 Anthropic

50.1

Rank #42 Confirmed

GPT-5.3 Chat OpenAI

42.1

Rank #109 Confirmed

Summary

  • They share 18 benchmarks with published results for both. Claude Sonnet 4.6 scores higher in 8 categories and GPT-5.3 Chat in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Sonnet 4.6 leads 46.1 to 27.3.
  • GPT-5.3 Chat is cheaper at $1.75 / $14 per million input/output tokens, against $3 / $15 for Claude Sonnet 4.6.
  • Claude Sonnet 4.6 accepts more context: 1M tokens versus 128K.

Side by side

Claude Sonnet 4.6GPT-5.3 Chat
ProviderAnthropicOpenAI
Noometry Index50.142.1
Released2026-02-172026-03-03
WeightsProprietaryProprietary
Context window1M128K
Max output128K16K
Input $ / M tokens$3$1.75
Output $ / M tokens$15$14
Results tracked5718

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Category by category

Coding Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 46.0 (#62), GPT-5.3 Chat: 40.8 (#124)

BenchmarkClaude Sonnet 4.6GPT-5.3 Chat
LMArena Coding15041408
SWE-bench Verified75.2%—
DeepSWE29.9%—
FrontierCode24.3%—
LMArena WebDev1521—
SciCode46.8%—
WeirdML66.1%—
ALE-Bench1,327—

Agentic & Tool Use Not comparable

Claude Sonnet 4.6: 39.1 (#26), GPT-5.3 Chat: —

BenchmarkClaude Sonnet 4.6GPT-5.3 Chat
Terminal-Bench53.4%—
APEX-Agents43%—
OSWorld 2.09.3%—
DeepResearch Bench54.9%—
OSWorld72.1%—
ExploitBench23.6%—
GBAEval48.8%—
GDP.pdf18%—
LMArena Search1221—
Vending-Bench 27,204—

Reasoning Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 46.1 (#40), GPT-5.3 Chat: 27.3 (#105)

BenchmarkClaude Sonnet 4.6GPT-5.3 Chat
LMArena Hard Prompts14851399
ARC-AGI-260.4%—
NYT Connections (extended)80.9%—
ARC-AGI-186.5%—
CritPt3.1%—
Chess Puzzles13%—
Thematic Generalization76.3%—
Mystery Game Puzzles16%—
DTBench89.9%—
LMCA46.5%—
Epoch Capabilities Index152.25—
ForecastBench62—

Math Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 51.9 (#41), GPT-5.3 Chat: 35.4 (#146)

BenchmarkClaude Sonnet 4.6GPT-5.3 Chat
LMArena Math14631389
OTIS Mock AIME 2024-202585.8%—
ProofBench45%—
FrontierMath (Feb 2025 set)32.4%—
FrontierMath Tier 4 (v1)8.3%—

Knowledge Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 51.6 (#60), GPT-5.3 Chat: 38.2 (#137)

BenchmarkClaude Sonnet 4.6GPT-5.3 Chat
LMArena Expert15001397
GPQA Diamond87.4%—
SimpleQA Verified35.5%—
Vectara Hallucination Rate10.6%—

Multimodal Not comparable

Claude Sonnet 4.6: 38.0 (#61), GPT-5.3 Chat: —

BenchmarkClaude Sonnet 4.6GPT-5.3 Chat
LMArena Vision1283—
Blueprint-Bench 26.7%—
LMArena Document1482—

Multilingual Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 54.6 (#39), GPT-5.3 Chat: 50.5 (#119)

BenchmarkClaude Sonnet 4.6GPT-5.3 Chat
LMArena Non-English14401383
LMArena Chinese14911433
LMArena French14651398
LMArena German14281384
LMArena Japanese14191351
LMArena Korean14111347
LMArena Russian14401400
LMArena Spanish14651371

Instruction Following Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 77.6 (#23), GPT-5.3 Chat: 73.0 (#124)

BenchmarkClaude Sonnet 4.6GPT-5.3 Chat
LMArena Instruction Following14761378

Long Context Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 45.3 (#40), GPT-5.3 Chat: 42.6 (#115)

BenchmarkClaude Sonnet 4.6GPT-5.3 Chat
LMArena Longer Query14791396

Writing & Preference Claude Sonnet 4.6 leads

Claude Sonnet 4.6: 70.4 (#22), GPT-5.3 Chat: 63.3 (#65)

BenchmarkClaude Sonnet 4.6GPT-5.3 Chat
LMArena Text14581389
LMArena Creative Writing14351356
EQ-Bench Creative Writing18101690
LMArena Multi-Turn14641413
EQ-Bench 41207—

Frequently asked questions

Is Claude Sonnet 4.6 better than GPT-5.3 Chat?

Claude Sonnet 4.6 is the stronger model overall, scoring 50.1 to 42.1 on the Noometry Index.

Which is cheaper, Claude Sonnet 4.6 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 Sonnet 4.6 lists at $3 and $15.

Is Claude Sonnet 4.6 or GPT-5.3 Chat better for coding?

Claude Sonnet 4.6 scores higher on coding benchmarks: 46.0 versus 40.8 in the Noometry coding category.

Which has the bigger context window?

Claude Sonnet 4.6 does, with 1M tokens against 128K.

How many benchmarks do Claude Sonnet 4.6 and GPT-5.3 Chat share?

18 benchmarks have published results for both models. Claude Sonnet 4.6 has 57 scored results on Noometry and GPT-5.3 Chat has 18.

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