# 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.

- Canonical page: https://noometry.com/compare/claude-2-vs-gpt-5-3-codex
- Last updated: 2026-10-12
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both.

## Snapshot

| | Claude 2 | GPT-5.3 Codex |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 25.0 | 45.8 |
| Rank | 346 | 69 |
| Context | — | 400K |
| Input $/M | — | $1.75 |
| Output $/M | — | $14 |
| Weights | Proprietary | Proprietary |

## Coding

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

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

## Agentic & Tool Use

- Claude 2: —
- GPT-5.3 Codex: 48.0 (#9)

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

## Reasoning

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

| Benchmark | Claude 2 | GPT-5.3 Codex |
|---|---|---|
| Epoch Capabilities Index | 120.13 | 156.77 |
| DTBench | 51.9% | — |

## Math

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

| Benchmark | Claude 2 | GPT-5.3 Codex |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | — |
| MATH Level 5 | 11.7% | — |

## Knowledge

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

| Benchmark | Claude 2 | GPT-5.3 Codex |
|---|---|---|
| GPQA Diamond | 34.7% | — |
| MMLU | 78.5% | — |
| TriviaQA | 87.5% | — |

## FAQ

### 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.