Noometry

Model comparison

Claude 2 vs GPT-5.3 Codex

GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 25.0 on the Noometry Index.

Last verified . 1 shared benchmarks.

Claude 2 Anthropic

25.0

Rank #346 Reported

GPT-5.3 Codex OpenAI

45.8

Rank #69 Reported

Summary

  • They share 1 benchmark with published results for both.

Side by side

Claude 2GPT-5.3 Codex
ProviderAnthropicOpenAI
Noometry Index25.045.8
Released2023-07-112026-02-05
WeightsProprietaryProprietary
Context window—400K
Max output—128K
Input $ / M tokens—$1.75
Output $ / M tokens—$14
Results tracked88

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Category by category

Coding Not comparable

Claude 2: —, GPT-5.3 Codex: 48.6 (#56)

BenchmarkClaude 2GPT-5.3 Codex
SWE-bench Verified—74.8%
LMArena WebDev—1409
WeirdML—79.3%
ALE-Bench—1,655
HumanEval+61.6%—

Agentic & Tool Use Not comparable

Claude 2: —, GPT-5.3 Codex: 48.0 (#9)

BenchmarkClaude 2GPT-5.3 Codex
Terminal-Bench—78.4%
METR Time Horizons—74.5%
Vending-Bench 2—5,940

Reasoning Not comparable

Claude 2: 21.7 (#216), GPT-5.3 Codex: —

BenchmarkClaude 2GPT-5.3 Codex
Epoch Capabilities Index120.13156.77
DTBench51.9%—

Math Not comparable

Claude 2: 9.3 (#320), GPT-5.3 Codex: —

BenchmarkClaude 2GPT-5.3 Codex
OTIS Mock AIME 2024-20252.5%—
MATH Level 511.7%—

Knowledge Not comparable

Claude 2: 16.9 (#287), GPT-5.3 Codex: —

BenchmarkClaude 2GPT-5.3 Codex
GPQA Diamond34.7%—
MMLU78.5%—
TriviaQA87.5%—

Frequently asked questions

Is Claude 2 better than GPT-5.3 Codex?

GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 25.0 on the Noometry Index.

How many benchmarks do Claude 2 and GPT-5.3 Codex share?

1 benchmark has published results for both models. Claude 2 has 8 scored results on Noometry and GPT-5.3 Codex has 8.

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