# GPT-6 Luna vs Mistral Large 3

> GPT-6 Luna is the stronger model overall, scoring 45.1 to 38.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-6-luna-vs-mistral-large-3
- Last updated: 2026-10-10
- Shared benchmarks: 15

## Summary

- They share 15 benchmarks with published results for both. GPT-6 Luna scores higher in 6 categories and Mistral Large 3 in 3 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in coding, where GPT-6 Luna leads 54.7 to 34.1.
- The biggest single-benchmark swing is NYT Connections (extended): 68.7% for GPT-6 Luna and 7.5% for Mistral Large 3.
- GPT-6 Luna is cheaper at $0.10 / $0.50 per million input/output tokens, against $0.25 / $0.75 for Mistral Large 3.
- GPT-6 Luna accepts more context: 1.05M tokens versus 262K.
- Mistral Large 3 has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-6 Luna | Mistral Large 3 |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 45.1 | 38.6 |
| Rank | 65 | 172 |
| Context | 1.05M | 262K |
| Input $/M | $0.10 | $0.25 |
| Output $/M | $0.50 | $0.75 |
| Weights | Proprietary | Open |

## Coding

- GPT-6 Luna: 54.7 (#24)
- Mistral Large 3: 34.1 (#230)

| Benchmark | GPT-6 Luna | Mistral Large 3 |
|---|---|---|
| LMArena WebDev | 1583 | 1230 |
| LMArena Coding | 1448 | 1447 |
| DeepSWE | 66.6% | — |
| FrontierCode | 42.4% | — |

## Reasoning

- GPT-6 Luna: 31.7 (#68)
- Mistral Large 3: 14.6 (#314)

| Benchmark | GPT-6 Luna | Mistral Large 3 |
|---|---|---|
| NYT Connections (extended) | 68.7% | 7.5% |
| LMArena Hard Prompts | 1415 | 1429 |
| Kagi LLM Benchmark | — | 50.9% |
| Thematic Generalization | — | 23% |

## Math

- GPT-6 Luna: 35.6 (#140)
- Mistral Large 3: 36.0 (#131)

| Benchmark | GPT-6 Luna | Mistral Large 3 |
|---|---|---|
| LMArena Math | 1396 | 1415 |

## Knowledge

- GPT-6 Luna: 40.1 (#110)
- Mistral Large 3: 35.5 (#173)

| Benchmark | GPT-6 Luna | Mistral Large 3 |
|---|---|---|
| LMArena Expert | 1458 | 1421 |
| Vectara Hallucination Rate | — | 14.5% |

## Multimodal

- GPT-6 Luna: 42.0 (#27)
- Mistral Large 3: 37.6 (#65)

| Benchmark | GPT-6 Luna | Mistral Large 3 |
|---|---|---|
| LMArena Vision | — | 1222 |
| Furniture Assembly | 44.2% | — |

## Multilingual

- GPT-6 Luna: 51.0 (#111)
- Mistral Large 3: 52.6 (#79)

| Benchmark | GPT-6 Luna | Mistral Large 3 |
|---|---|---|
| LMArena Non-English | 1390 | 1412 |
| LMArena Chinese | 1425 | 1448 |
| LMArena Russian | 1392 | 1412 |
| LMArena Spanish | 1416 | 1437 |
| LMArena French | — | 1456 |
| LMArena German | — | 1438 |
| LMArena Japanese | — | 1399 |
| LMArena Korean | — | 1384 |

## Instruction Following

- GPT-6 Luna: 74.7 (#85)
- Mistral Large 3: 74.1 (#104)

| Benchmark | GPT-6 Luna | Mistral Large 3 |
|---|---|---|
| LMArena Instruction Following | 1414 | 1402 |

## Long Context

- GPT-6 Luna: 43.3 (#95)
- Mistral Large 3: 43.1 (#102)

| Benchmark | GPT-6 Luna | Mistral Large 3 |
|---|---|---|
| LMArena Longer Query | 1417 | 1413 |

## Writing & Preference

- GPT-6 Luna: 58.4 (#115)
- Mistral Large 3: 60.2 (#100)

| Benchmark | GPT-6 Luna | Mistral Large 3 |
|---|---|---|
| LMArena Text | 1392 | 1427 |
| LMArena Creative Writing | 1357 | 1385 |
| LMArena Multi-Turn | 1400 | 1429 |
| EQ-Bench Creative Writing | — | 1412 |

## FAQ

### Is GPT-6 Luna better than Mistral Large 3?

GPT-6 Luna is the stronger model overall, scoring 45.1 to 38.6 on the Noometry Index.

### Which is cheaper, GPT-6 Luna or Mistral Large 3?

GPT-6 Luna is cheaper. It lists at $0.10 per million input tokens and $0.50 per million output tokens; Mistral Large 3 lists at $0.25 and $0.75.

### Is GPT-6 Luna or Mistral Large 3 better for coding?

GPT-6 Luna scores higher on coding benchmarks: 54.7 versus 34.1 in the Noometry coding category.

### Which has the bigger context window?

GPT-6 Luna does, with 1.05M tokens against 262K.

### How many benchmarks do GPT-6 Luna and Mistral Large 3 share?

15 benchmarks have published results for both models. GPT-6 Luna has 18 scored results on Noometry and Mistral Large 3 has 24.