# GPT-5.3 Chat vs Mistral Large 3

> GPT-5.3 Chat is the stronger model overall, scoring 42.1 to 38.6 on the Noometry Index. Mistral Large 3 costs 13× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-3-chat-vs-mistral-large-3
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. GPT-5.3 Chat scores higher in 4 categories and Mistral Large 3 in 4 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.3 Chat leads 27.3 to 14.6.
- Mistral Large 3 is cheaper at $0.25 / $0.75 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
- Mistral Large 3 accepts more context: 262K tokens versus 128K.
- Mistral Large 3 has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.3 Chat | Mistral Large 3 |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 42.1 | 38.6 |
| Rank | 109 | 172 |
| Context | 128K | 262K |
| Input $/M | $1.75 | $0.25 |
| Output $/M | $14 | $0.75 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.3 Chat: 40.8 (#124)
- Mistral Large 3: 34.1 (#230)

| Benchmark | GPT-5.3 Chat | Mistral Large 3 |
|---|---|---|
| LMArena Coding | 1408 | 1447 |
| LMArena WebDev | — | 1230 |

## Reasoning

- GPT-5.3 Chat: 27.3 (#105)
- Mistral Large 3: 14.6 (#314)

| Benchmark | GPT-5.3 Chat | Mistral Large 3 |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1429 |
| Kagi LLM Benchmark | — | 50.9% |
| NYT Connections (extended) | — | 7.5% |
| Thematic Generalization | — | 23% |

## Math

- GPT-5.3 Chat: 35.4 (#146)
- Mistral Large 3: 36.0 (#131)

| Benchmark | GPT-5.3 Chat | Mistral Large 3 |
|---|---|---|
| LMArena Math | 1389 | 1415 |

## Knowledge

- GPT-5.3 Chat: 38.2 (#137)
- Mistral Large 3: 35.5 (#173)

| Benchmark | GPT-5.3 Chat | Mistral Large 3 |
|---|---|---|
| LMArena Expert | 1397 | 1421 |
| Vectara Hallucination Rate | — | 14.5% |

## Multimodal

- GPT-5.3 Chat: —
- Mistral Large 3: 37.6 (#65)

| Benchmark | GPT-5.3 Chat | Mistral Large 3 |
|---|---|---|
| LMArena Vision | — | 1222 |

## Multilingual

- GPT-5.3 Chat: 50.5 (#119)
- Mistral Large 3: 52.6 (#79)

| Benchmark | GPT-5.3 Chat | Mistral Large 3 |
|---|---|---|
| LMArena Non-English | 1383 | 1412 |
| LMArena Chinese | 1433 | 1448 |
| LMArena French | 1398 | 1456 |
| LMArena German | 1384 | 1438 |
| LMArena Japanese | 1351 | 1399 |
| LMArena Korean | 1347 | 1384 |
| LMArena Russian | 1400 | 1412 |
| LMArena Spanish | 1371 | 1437 |

## Instruction Following

- GPT-5.3 Chat: 73.0 (#124)
- Mistral Large 3: 74.1 (#104)

| Benchmark | GPT-5.3 Chat | Mistral Large 3 |
|---|---|---|
| LMArena Instruction Following | 1378 | 1402 |

## Long Context

- GPT-5.3 Chat: 42.6 (#115)
- Mistral Large 3: 43.1 (#102)

| Benchmark | GPT-5.3 Chat | Mistral Large 3 |
|---|---|---|
| LMArena Longer Query | 1396 | 1413 |

## Writing & Preference

- GPT-5.3 Chat: 63.3 (#65)
- Mistral Large 3: 60.2 (#100)

| Benchmark | GPT-5.3 Chat | Mistral Large 3 |
|---|---|---|
| LMArena Text | 1389 | 1427 |
| LMArena Creative Writing | 1356 | 1385 |
| EQ-Bench Creative Writing | 1690 | 1412 |
| LMArena Multi-Turn | 1413 | 1429 |

## FAQ

### Is GPT-5.3 Chat better than Mistral Large 3?

GPT-5.3 Chat is the stronger model overall, scoring 42.1 to 38.6 on the Noometry Index. Mistral Large 3 costs 13× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.3 Chat or Mistral Large 3?

Mistral Large 3 is cheaper. It lists at $0.25 per million input tokens and $0.75 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.

### Is GPT-5.3 Chat or Mistral Large 3 better for coding?

GPT-5.3 Chat scores higher on coding benchmarks: 40.8 versus 34.1 in the Noometry coding category.

### Which has the bigger context window?

Mistral Large 3 does, with 262K tokens against 128K.

### How many benchmarks do GPT-5.3 Chat and Mistral Large 3 share?

18 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Mistral Large 3 has 24.