# Mistral Small 3.1 vs Solar Pro4

> Solar Pro4 is the stronger model overall, scoring 41.5 to 31.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/mistral-small-3-1-vs-solar-pro4
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Mistral Small 3.1 scores higher in 0 categories and Solar Pro4 in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Solar Pro4 leads 36.1 to 13.7.
- Mistral Small 3.1 is cheaper at $0.35 / $0.56 per million input/output tokens, against $0.30 / $1.20 for Solar Pro4.
- Solar Pro4 accepts more context: 524K tokens versus 128K.
- Mistral Small 3.1 has downloadable open weights; the other is API-only.

## Snapshot

| | Mistral Small 3.1 | Solar Pro4 |
|---|---|---|
| Provider | Mistral AI | Upstage |
| Noometry Index | 31.4 | 41.5 |
| Rank | 263 | 123 |
| Context | 128K | 524K |
| Input $/M | $0.35 | $0.30 |
| Output $/M | $0.56 | $1.20 |
| Weights | Open | Proprietary |

## Coding

- Mistral Small 3.1: 37.7 (#175)
- Solar Pro4: 39.9 (#135)

| Benchmark | Mistral Small 3.1 | Solar Pro4 |
|---|---|---|
| LMArena Coding | 1309 | 1439 |
| LMArena WebDev | — | 1371 |

## Reasoning

- Mistral Small 3.1: 18.9 (#249)
- Solar Pro4: 27.3 (#107)

| Benchmark | Mistral Small 3.1 | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1278 | 1398 |
| Chess Puzzles | 1% | — |
| Epoch Capabilities Index | 127.48 | — |

## Math

- Mistral Small 3.1: 13.7 (#295)
- Solar Pro4: 36.1 (#129)

| Benchmark | Mistral Small 3.1 | Solar Pro4 |
|---|---|---|
| LMArena Math | 1261 | 1418 |
| OTIS Mock AIME 2024-2025 | 3.9% | — |
| Omni-MATH | 24.8% | — |

## Knowledge

- Mistral Small 3.1: 22.6 (#266)
- Solar Pro4: 39.0 (#128)

| Benchmark | Mistral Small 3.1 | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1258 | 1421 |
| GPQA Diamond | 41.9% | — |
| MMLU-Pro | 61% | — |
| GPQA (HELM) | 39.2% | — |

## Multimodal

- Mistral Small 3.1: 32.6 (#93)
- Solar Pro4: —

| Benchmark | Mistral Small 3.1 | Solar Pro4 |
|---|---|---|
| LMArena Vision | 1136 | — |

## Multilingual

- Mistral Small 3.1: 41.4 (#204)
- Solar Pro4: 49.0 (#134)

| Benchmark | Mistral Small 3.1 | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1255 | 1362 |
| LMArena Chinese | 1254 | 1417 |
| LMArena French | 1270 | 1403 |
| LMArena German | 1266 | 1351 |
| LMArena Japanese | 1210 | 1300 |
| LMArena Korean | 1206 | 1383 |
| LMArena Russian | 1263 | 1360 |
| LMArena Spanish | 1283 | 1408 |

## Instruction Following

- Mistral Small 3.1: 63.8 (#225)
- Solar Pro4: 72.8 (#128)

| Benchmark | Mistral Small 3.1 | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1264 | 1376 |
| IFEval | 75% | — |

## Long Context

- Mistral Small 3.1: 39.5 (#172)
- Solar Pro4: 42.0 (#125)

| Benchmark | Mistral Small 3.1 | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1300 | 1379 |

## Writing & Preference

- Mistral Small 3.1: 37.2 (#254)
- Solar Pro4: 56.7 (#133)

| Benchmark | Mistral Small 3.1 | Solar Pro4 |
|---|---|---|
| LMArena Text | 1278 | 1386 |
| LMArena Creative Writing | 1253 | 1313 |
| LMArena Multi-Turn | 1270 | 1391 |
| EQ-Bench Creative Writing | 761 | — |
| WildBench | 78.8% | — |

## FAQ

### Is Mistral Small 3.1 better than Solar Pro4?

Solar Pro4 is the stronger model overall, scoring 41.5 to 31.4 on the Noometry Index.

### Which is cheaper, Mistral Small 3.1 or Solar Pro4?

Mistral Small 3.1 is cheaper. It lists at $0.35 per million input tokens and $0.56 per million output tokens; Solar Pro4 lists at $0.30 and $1.20.

### Is Mistral Small 3.1 or Solar Pro4 better for coding?

Solar Pro4 scores higher on coding benchmarks: 39.9 versus 37.7 in the Noometry coding category.

### Which has the bigger context window?

Solar Pro4 does, with 524K tokens against 128K.

### How many benchmarks do Mistral Small 3.1 and Solar Pro4 share?

17 benchmarks have published results for both models. Mistral Small 3.1 has 28 scored results on Noometry and Solar Pro4 has 18.