# DeepSeek-V3.1 vs Solar Pro4

> DeepSeek-V3.1 and Solar Pro4 score almost the same on the Noometry Index (42.2 vs 41.5), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/deepseek-v3-1-vs-solar-pro4
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. DeepSeek-V3.1 scores higher in 5 categories and Solar Pro4 in 3 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in long context, where Solar Pro4 leads 42.0 to 36.3.
- DeepSeek-V3.1 is cheaper at $0.25 / $0.95 per million input/output tokens, against $0.30 / $1.20 for Solar Pro4.
- Solar Pro4 accepts more context: 524K tokens versus 164K.
- DeepSeek-V3.1 has downloadable open weights; the other is API-only.

## Snapshot

| | DeepSeek-V3.1 | Solar Pro4 |
|---|---|---|
| Provider | DeepSeek | Upstage |
| Noometry Index | 42.2 | 41.5 |
| Rank | 106 | 123 |
| Context | 164K | 524K |
| Input $/M | $0.25 | $0.30 |
| Output $/M | $0.95 | $1.20 |
| Weights | Open | Proprietary |

## Coding

- DeepSeek-V3.1: 39.8 (#140)
- Solar Pro4: 39.9 (#135)

| Benchmark | DeepSeek-V3.1 | Solar Pro4 |
|---|---|---|
| LMArena Coding | 1417 | 1439 |
| LMArena WebDev | — | 1371 |
| WeirdML | 38.4% | — |

## Reasoning

- DeepSeek-V3.1: 27.3 (#109)
- Solar Pro4: 27.3 (#107)

| Benchmark | DeepSeek-V3.1 | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1417 | 1398 |
| SimpleBench | 40% | — |
| Kagi LLM Benchmark | 53.2% | — |
| DTBench | 82.7% | — |
| LMCA | 24.3% | — |
| Epoch Capabilities Index | 139.92 | — |
| ForecastBench | 58 | — |

## Math

- DeepSeek-V3.1: 36.1 (#125)
- Solar Pro4: 36.1 (#129)

| Benchmark | DeepSeek-V3.1 | Solar Pro4 |
|---|---|---|
| LMArena Math | 1420 | 1418 |

## Knowledge

- DeepSeek-V3.1: 43.0 (#86)
- Solar Pro4: 39.0 (#128)

| Benchmark | DeepSeek-V3.1 | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1403 | 1421 |
| Vectara Hallucination Rate | 5.5% | — |

## Multilingual

- DeepSeek-V3.1: 51.8 (#100)
- Solar Pro4: 49.0 (#134)

| Benchmark | DeepSeek-V3.1 | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1400 | 1362 |
| LMArena Chinese | 1470 | 1417 |
| LMArena French | 1447 | 1403 |
| LMArena German | 1412 | 1351 |
| LMArena Japanese | 1374 | 1300 |
| LMArena Korean | 1337 | 1383 |
| LMArena Russian | 1405 | 1360 |
| LMArena Spanish | 1429 | 1408 |

## Instruction Following

- DeepSeek-V3.1: 74.1 (#105)
- Solar Pro4: 72.8 (#128)

| Benchmark | DeepSeek-V3.1 | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1400 | 1376 |

## Long Context

- DeepSeek-V3.1: 36.3 (#227)
- Solar Pro4: 42.0 (#125)

| Benchmark | DeepSeek-V3.1 | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1422 | 1379 |
| Fiction.LiveBench | 52.8% | — |

## Writing & Preference

- DeepSeek-V3.1: 60.5 (#93)
- Solar Pro4: 56.7 (#133)

| Benchmark | DeepSeek-V3.1 | Solar Pro4 |
|---|---|---|
| LMArena Text | 1420 | 1386 |
| LMArena Creative Writing | 1401 | 1313 |
| LMArena Multi-Turn | 1408 | 1391 |
| EQ-Bench Creative Writing | 1436 | — |

## FAQ

### Is DeepSeek-V3.1 better than Solar Pro4?

DeepSeek-V3.1 and Solar Pro4 score almost the same on the Noometry Index (42.2 vs 41.5), so choose on price, context window or the category you care about most.

### Which is cheaper, DeepSeek-V3.1 or Solar Pro4?

DeepSeek-V3.1 is cheaper. It lists at $0.25 per million input tokens and $0.95 per million output tokens; Solar Pro4 lists at $0.30 and $1.20.

### Is DeepSeek-V3.1 or Solar Pro4 better for coding?

They score almost the same on coding (39.8 vs 39.9); test both on your own repository before choosing.

### Which has the bigger context window?

Solar Pro4 does, with 524K tokens against 164K.

### How many benchmarks do DeepSeek-V3.1 and Solar Pro4 share?

17 benchmarks have published results for both models. DeepSeek-V3.1 has 27 scored results on Noometry and Solar Pro4 has 18.