# GPT-5.3 Codex vs Mistral Large 4

> GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 43.1 on the Noometry Index. Mistral Large 4 costs 4.7× less per token, which makes it the better buy when GPT-5.3 Codex's lead doesn't matter for your workload.

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

## Summary

- They share 1 benchmark with published results for both. GPT-5.3 Codex scores higher in 1 category and Mistral Large 4 in 0 categories, but none of those gaps is larger than the uncertainty.
- Mistral Large 4 is cheaper at $0.68 / $2.09 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Codex.
- Mistral Large 4 accepts more context: 1.05M tokens versus 400K.

## Snapshot

| | GPT-5.3 Codex | Mistral Large 4 |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 45.8 | 43.1 |
| Rank | 69 | 99 |
| Context | 400K | 1.05M |
| Input $/M | $1.75 | $0.68 |
| Output $/M | $14 | $2.09 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.3 Codex: 48.6 (#56)
- Mistral Large 4: 48.6 (#57)

| Benchmark | GPT-5.3 Codex | Mistral Large 4 |
|---|---|---|
| LMArena WebDev | 1409 | 1541 |
| SWE-bench Verified | 74.8% | — |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1475 |
| ALE-Bench | 1,655 | — |

## Agentic & Tool Use

- GPT-5.3 Codex: 48.0 (#9)
- Mistral Large 4: —

| Benchmark | GPT-5.3 Codex | Mistral Large 4 |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |

## Reasoning

- GPT-5.3 Codex: —
- Mistral Large 4: 22.5 (#192)

| Benchmark | GPT-5.3 Codex | Mistral Large 4 |
|---|---|---|
| NYT Connections (extended) | — | 27.4% |
| LMArena Hard Prompts | — | 1444 |
| Epoch Capabilities Index | 156.77 | — |

## Math

- GPT-5.3 Codex: —
- Mistral Large 4: 40.4 (#91)

| Benchmark | GPT-5.3 Codex | Mistral Large 4 |
|---|---|---|
| LMArena Math | — | 1488 |

## Knowledge

- GPT-5.3 Codex: —
- Mistral Large 4: 36.6 (#166)

| Benchmark | GPT-5.3 Codex | Mistral Large 4 |
|---|---|---|
| SimpleQA Verified | — | 20% |
| LMArena Expert | — | 1447 |

## Multilingual

- GPT-5.3 Codex: —
- Mistral Large 4: 52.6 (#82)

| Benchmark | GPT-5.3 Codex | Mistral Large 4 |
|---|---|---|
| LMArena Non-English | — | 1415 |
| LMArena Chinese | — | 1491 |
| LMArena Russian | — | 1414 |

## Instruction Following

- GPT-5.3 Codex: —
- Mistral Large 4: 75.0 (#76)

| Benchmark | GPT-5.3 Codex | Mistral Large 4 |
|---|---|---|
| LMArena Instruction Following | — | 1424 |

## Long Context

- GPT-5.3 Codex: —
- Mistral Large 4: 43.6 (#89)

| Benchmark | GPT-5.3 Codex | Mistral Large 4 |
|---|---|---|
| LMArena Longer Query | — | 1429 |

## Writing & Preference

- GPT-5.3 Codex: —
- Mistral Large 4: 60.4 (#97)

| Benchmark | GPT-5.3 Codex | Mistral Large 4 |
|---|---|---|
| LMArena Text | — | 1427 |
| LMArena Creative Writing | — | 1361 |
| LMArena Multi-Turn | — | 1424 |

## FAQ

### Is GPT-5.3 Codex better than Mistral Large 4?

GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 43.1 on the Noometry Index. Mistral Large 4 costs 4.7× less per token, which makes it the better buy when GPT-5.3 Codex's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.3 Codex or Mistral Large 4?

Mistral Large 4 is cheaper. It lists at $0.68 per million input tokens and $2.09 per million output tokens; GPT-5.3 Codex lists at $1.75 and $14.

### Is GPT-5.3 Codex or Mistral Large 4 better for coding?

They score almost the same on coding (48.6 vs 48.6); test both on your own repository before choosing.

### Which has the bigger context window?

Mistral Large 4 does, with 1.05M tokens against 400K.

### How many benchmarks do GPT-5.3 Codex and Mistral Large 4 share?

1 benchmark has published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Mistral Large 4 has 15.