# GPT-5.3 Codex vs Grok 4.1

> GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 41.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-3-codex-vs-grok-4-1
- Last updated: 2026-10-12
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. GPT-5.3 Codex scores higher in 2 categories and Grok 4.1 in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in coding, where GPT-5.3 Codex leads 48.6 to 33.7.

## Snapshot

| | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 45.8 | 41.5 |
| Rank | 69 | 134 |
| Context | 400K | — |
| Input $/M | $1.75 | — |
| Output $/M | $14 | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.3 Codex: 48.6 (#56)
- Grok 4.1: 33.7 (#253)

| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| LMArena WebDev | 1409 | 1214 |
| SWE-bench Verified | 74.8% | — |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1445 |
| ALE-Bench | 1,655 | — |

## Agentic & Tool Use

- GPT-5.3 Codex: 48.0 (#9)
- Grok 4.1: 34.1 (#49)

| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| Cybench | — | 39% |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |

## Reasoning

- GPT-5.3 Codex: —
- Grok 4.1: 29.5 (#91)

| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| LMArena Hard Prompts | — | 1435 |
| Epoch Capabilities Index | 156.77 | — |

## Math

- GPT-5.3 Codex: —
- Grok 4.1: 38.9 (#120)

| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| LMArena Math | — | 1422 |

## Knowledge

- GPT-5.3 Codex: —
- Grok 4.1: 39.5 (#133)

| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| LMArena Expert | — | 1417 |

## Multilingual

- GPT-5.3 Codex: —
- Grok 4.1: 53.4 (#68)

| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| LMArena Non-English | — | 1425 |
| LMArena Chinese | — | 1465 |
| LMArena French | — | 1448 |
| LMArena German | — | 1446 |
| LMArena Japanese | — | 1397 |
| LMArena Korean | — | 1407 |
| LMArena Russian | — | 1434 |
| LMArena Spanish | — | 1438 |

## Instruction Following

- GPT-5.3 Codex: —
- Grok 4.1: 73.8 (#111)

| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| LMArena Instruction Following | — | 1400 |

## Long Context

- GPT-5.3 Codex: —
- Grok 4.1: 43.2 (#100)

| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| LMArena Longer Query | — | 1416 |

## Writing & Preference

- GPT-5.3 Codex: —
- Grok 4.1: 62.4 (#75)

| Benchmark | GPT-5.3 Codex | Grok 4.1 |
|---|---|---|
| LMArena Text | — | 1437 |
| LMArena Creative Writing | — | 1411 |
| LMArena Multi-Turn | — | 1437 |

## FAQ

### Is GPT-5.3 Codex better than Grok 4.1?

GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 41.5 on the Noometry Index.

### Is GPT-5.3 Codex or Grok 4.1 better for coding?

GPT-5.3 Codex scores higher on coding benchmarks: 48.6 versus 33.7 in the Noometry coding category.

### How many benchmarks do GPT-5.3 Codex and Grok 4.1 share?

1 benchmark has published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Grok 4.1 has 19.