# ERNIE 5.1 vs GPT-5.3 Codex

> GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 43.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/ernie-5-1-vs-gpt-5-3-codex
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where GPT-5.3 Codex leads 48.5 to 43.4.

## Snapshot

| | ERNIE 5.1 | GPT-5.3 Codex |
|---|---|---|
| Provider | Baidu | OpenAI |
| Noometry Index | 43.1 | 45.5 |
| Rank | 87 | 61 |
| Context | — | 400K |
| Input $/M | — | $1.75 |
| Output $/M | — | $14 |
| Weights | Proprietary | Proprietary |

## Coding

- ERNIE 5.1: 43.4 (#78)
- GPT-5.3 Codex: 48.5 (#51)

| Benchmark | ERNIE 5.1 | GPT-5.3 Codex |
|---|---|---|
| SWE-bench Verified | — | 74.8% |
| LMArena WebDev | — | 1408 |
| WeirdML | — | 79.3% |
| LMArena Coding | 1488 | — |
| ALE-Bench | — | 1,655 |

## Agentic & Tool Use

- ERNIE 5.1: —
- GPT-5.3 Codex: 47.8 (#9)

| Benchmark | ERNIE 5.1 | GPT-5.3 Codex |
|---|---|---|
| Terminal-Bench | — | 78.4% |
| LMArena Search | 1227 | — |
| METR Time Horizons | — | 74.5% |
| Vending-Bench 2 | — | 5,940 |

## Reasoning

- ERNIE 5.1: 20.9 (#209)
- GPT-5.3 Codex: —

| Benchmark | ERNIE 5.1 | GPT-5.3 Codex |
|---|---|---|
| NYT Connections (extended) | 23.4% | — |
| LMArena Hard Prompts | 1481 | — |
| Epoch Capabilities Index | — | 156.84 |

## Math

- ERNIE 5.1: 37.5 (#96)
- GPT-5.3 Codex: —

| Benchmark | ERNIE 5.1 | GPT-5.3 Codex |
|---|---|---|
| LMArena Math | 1481 | — |

## Knowledge

- ERNIE 5.1: 41.2 (#103)
- GPT-5.3 Codex: —

| Benchmark | ERNIE 5.1 | GPT-5.3 Codex |
|---|---|---|
| LMArena Expert | 1491 | — |

## Multilingual

- ERNIE 5.1: 55.7 (#28)
- GPT-5.3 Codex: —

| Benchmark | ERNIE 5.1 | GPT-5.3 Codex |
|---|---|---|
| LMArena Non-English | 1455 | — |
| LMArena Chinese | 1507 | — |
| LMArena French | 1486 | — |
| LMArena German | 1470 | — |
| LMArena Japanese | 1422 | — |
| LMArena Korean | 1428 | — |
| LMArena Russian | 1459 | — |
| LMArena Spanish | 1472 | — |

## Instruction Following

- ERNIE 5.1: 76.9 (#35)
- GPT-5.3 Codex: —

| Benchmark | ERNIE 5.1 | GPT-5.3 Codex |
|---|---|---|
| LMArena Instruction Following | 1460 | — |

## Long Context

- ERNIE 5.1: 44.7 (#56)
- GPT-5.3 Codex: —

| Benchmark | ERNIE 5.1 | GPT-5.3 Codex |
|---|---|---|
| LMArena Longer Query | 1462 | — |

## Writing & Preference

- ERNIE 5.1: 65.3 (#50)
- GPT-5.3 Codex: —

| Benchmark | ERNIE 5.1 | GPT-5.3 Codex |
|---|---|---|
| LMArena Text | 1468 | — |
| LMArena Creative Writing | 1440 | — |
| LMArena Multi-Turn | 1471 | — |

## FAQ

### Is ERNIE 5.1 better than GPT-5.3 Codex?

GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 43.1 on the Noometry Index.

### Is ERNIE 5.1 or GPT-5.3 Codex better for coding?

GPT-5.3 Codex scores higher on coding benchmarks: 48.5 versus 43.4 in the Noometry coding category.

### How many benchmarks do ERNIE 5.1 and GPT-5.3 Codex share?

0 benchmarks have published results for both models. ERNIE 5.1 has 19 scored results on Noometry and GPT-5.3 Codex has 8.