# Devstral Small 2505 vs Solar Pro4

> Solar Pro4 is the stronger model overall, scoring 42.1 to 34.3 on the Noometry Index. Devstral Small 2505 costs 3.5× less per token, which makes it the better buy when Solar Pro4's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/devstral-small-vs-solar-pro4
- Last updated: 2026-10-12
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where Solar Pro4 leads 28.5 to 19.7.
- Devstral Small 2505 is cheaper at $0.10 / $0.30 per million input/output tokens, against $0.30 / $1.20 for Solar Pro4.
- Solar Pro4 accepts more context: 524K tokens versus 128K.
- Devstral Small 2505 has downloadable open weights; the other is API-only.

## Snapshot

| | Devstral Small 2505 | Solar Pro4 |
|---|---|---|
| Provider | Mistral AI | Upstage |
| Noometry Index | 34.3 | 42.1 |
| Rank | 233 | 121 |
| Context | 128K | 524K |
| Input $/M | $0.10 | $0.30 |
| Output $/M | $0.30 | $1.20 |
| Weights | Open | Proprietary |

## Coding

- Devstral Small 2505: 38.9 (#166)
- Solar Pro4: 40.1 (#149)

| Benchmark | Devstral Small 2505 | Solar Pro4 |
|---|---|---|
| SWE-bench Verified (bash only) | 56.4% | — |
| LMArena WebDev | — | 1371 |
| SciCode | 28.8% | — |
| LMArena Coding | — | 1437 |

## Reasoning

- Devstral Small 2505: 19.7 (#252)
- Solar Pro4: 28.5 (#104)

| Benchmark | Devstral Small 2505 | Solar Pro4 |
|---|---|---|
| Kagi LLM Benchmark | 37.7% | — |
| CritPt | 0% | — |
| LMArena Hard Prompts | — | 1399 |

## Math

- Devstral Small 2505: —
- Solar Pro4: 38.8 (#128)

| Benchmark | Devstral Small 2505 | Solar Pro4 |
|---|---|---|
| LMArena Math | — | 1416 |

## Knowledge

- Devstral Small 2505: —
- Solar Pro4: 39.8 (#129)

| Benchmark | Devstral Small 2505 | Solar Pro4 |
|---|---|---|
| LMArena Expert | — | 1427 |

## Multilingual

- Devstral Small 2505: —
- Solar Pro4: 48.7 (#139)

| Benchmark | Devstral Small 2505 | Solar Pro4 |
|---|---|---|
| LMArena Non-English | — | 1361 |
| LMArena Chinese | — | 1415 |
| LMArena French | — | 1397 |
| LMArena German | — | 1364 |
| LMArena Japanese | — | 1309 |
| LMArena Korean | — | 1382 |
| LMArena Russian | — | 1360 |
| LMArena Spanish | — | 1401 |

## Instruction Following

- Devstral Small 2505: —
- Solar Pro4: 72.7 (#132)

| Benchmark | Devstral Small 2505 | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | — | 1377 |

## Long Context

- Devstral Small 2505: —
- Solar Pro4: 42.1 (#130)

| Benchmark | Devstral Small 2505 | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | — | 1381 |

## Writing & Preference

- Devstral Small 2505: —
- Solar Pro4: 56.5 (#138)

| Benchmark | Devstral Small 2505 | Solar Pro4 |
|---|---|---|
| LMArena Text | — | 1386 |
| LMArena Creative Writing | — | 1316 |
| LMArena Multi-Turn | — | 1385 |

## FAQ

### Is Devstral Small 2505 better than Solar Pro4?

Solar Pro4 is the stronger model overall, scoring 42.1 to 34.3 on the Noometry Index. Devstral Small 2505 costs 3.5× less per token, which makes it the better buy when Solar Pro4's lead doesn't matter for your workload.

### Which is cheaper, Devstral Small 2505 or Solar Pro4?

Devstral Small 2505 is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; Solar Pro4 lists at $0.30 and $1.20.

### Is Devstral Small 2505 or Solar Pro4 better for coding?

Solar Pro4 scores higher on coding benchmarks: 40.1 versus 38.9 in the Noometry coding category.

### Which has the bigger context window?

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

### How many benchmarks do Devstral Small 2505 and Solar Pro4 share?

0 benchmarks have published results for both models. Devstral Small 2505 has 4 scored results on Noometry and Solar Pro4 has 18.