# DeepSeek V4.1 Flash vs Solar Pro4

> DeepSeek V4.1 Flash is the stronger model overall, scoring 52.8 to 42.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/deepseek-v4-1-flash-vs-solar-pro4
- Last updated: 2026-10-11
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. DeepSeek V4.1 Flash scores higher in 8 categories and Solar Pro4 in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where DeepSeek V4.1 Flash leads 66.7 to 38.8.
- DeepSeek V4.1 Flash is cheaper at $0.15 / $0.60 per million input/output tokens, against $0.30 / $1.20 for Solar Pro4.
- DeepSeek V4.1 Flash accepts more context: 1M tokens versus 524K.
- DeepSeek V4.1 Flash has downloadable open weights; the other is API-only.

## Snapshot

| | DeepSeek V4.1 Flash | Solar Pro4 |
|---|---|---|
| Provider | DeepSeek | Upstage |
| Noometry Index | 52.8 | 42.1 |
| Rank | 38 | 121 |
| Context | 1M | 524K |
| Input $/M | $0.15 | $0.30 |
| Output $/M | $0.60 | $1.20 |
| Weights | Open | Proprietary |

## Coding

- DeepSeek V4.1 Flash: 52.9 (#32)
- Solar Pro4: 40.1 (#149)

| Benchmark | DeepSeek V4.1 Flash | Solar Pro4 |
|---|---|---|
| LMArena WebDev | 1619 | 1371 |
| LMArena Coding | 1506 | 1437 |
| SciCode | 51.9% | — |
| ALE-Bench | 1,092 | — |

## Agentic & Tool Use

- DeepSeek V4.1 Flash: 31.2 (#69)
- Solar Pro4: —

| Benchmark | DeepSeek V4.1 Flash | Solar Pro4 |
|---|---|---|
| APEX-Agents | 39.5% | — |
| GDP.pdf | 19.8% | — |

## Reasoning

- DeepSeek V4.1 Flash: 50.2 (#36)
- Solar Pro4: 28.5 (#104)

| Benchmark | DeepSeek V4.1 Flash | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1483 | 1399 |
| NYT Connections (extended) | 89.6% | — |
| CritPt | 14.3% | — |
| Mystery Game Puzzles | 43% | — |
| DTBench | 89.9% | — |
| LMCA | 47% | — |
| Surface Evolver Bench | 46.3% | — |
| Epoch Capabilities Index | 154.9 | — |

## Math

- DeepSeek V4.1 Flash: 66.7 (#25)
- Solar Pro4: 38.8 (#128)

| Benchmark | DeepSeek V4.1 Flash | Solar Pro4 |
|---|---|---|
| LMArena Math | 1477 | 1416 |
| FrontierMath (Tiers 1-3) | 67.4% | — |
| FrontierMath Tier 4 | 26.8% | — |
| OTIS Mock AIME 2024-2025 | 98.3% | — |
| ProofBench | 54% | — |

## Knowledge

- DeepSeek V4.1 Flash: 57.9 (#38)
- Solar Pro4: 39.8 (#129)

| Benchmark | DeepSeek V4.1 Flash | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1506 | 1427 |
| GPQA Diamond | 89.8% | — |

## Multimodal

- DeepSeek V4.1 Flash: 39.1 (#61)
- Solar Pro4: —

| Benchmark | DeepSeek V4.1 Flash | Solar Pro4 |
|---|---|---|
| LMArena Vision | 1277 | — |
| Furniture Assembly | 34.2% | — |

## Multilingual

- DeepSeek V4.1 Flash: 55.0 (#35)
- Solar Pro4: 48.7 (#139)

| Benchmark | DeepSeek V4.1 Flash | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1448 | 1361 |
| LMArena Chinese | 1497 | 1415 |
| LMArena French | 1452 | 1397 |
| LMArena German | 1484 | 1364 |
| LMArena Japanese | 1412 | 1309 |
| LMArena Korean | 1452 | 1382 |
| LMArena Russian | 1471 | 1360 |
| LMArena Spanish | 1459 | 1401 |

## Instruction Following

- DeepSeek V4.1 Flash: 77.3 (#26)
- Solar Pro4: 72.7 (#132)

| Benchmark | DeepSeek V4.1 Flash | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1474 | 1377 |

## Long Context

- DeepSeek V4.1 Flash: 45.2 (#47)
- Solar Pro4: 42.1 (#130)

| Benchmark | DeepSeek V4.1 Flash | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1475 | 1381 |

## Writing & Preference

- DeepSeek V4.1 Flash: 65.4 (#48)
- Solar Pro4: 56.5 (#138)

| Benchmark | DeepSeek V4.1 Flash | Solar Pro4 |
|---|---|---|
| LMArena Text | 1462 | 1386 |
| LMArena Creative Writing | 1435 | 1316 |
| LMArena Multi-Turn | 1457 | 1385 |
| EQ-Bench Creative Writing | 1540 | — |

## FAQ

### Is DeepSeek V4.1 Flash better than Solar Pro4?

DeepSeek V4.1 Flash is the stronger model overall, scoring 52.8 to 42.1 on the Noometry Index.

### Which is cheaper, DeepSeek V4.1 Flash or Solar Pro4?

DeepSeek V4.1 Flash is cheaper. It lists at $0.15 per million input tokens and $0.60 per million output tokens; Solar Pro4 lists at $0.30 and $1.20.

### Is DeepSeek V4.1 Flash or Solar Pro4 better for coding?

DeepSeek V4.1 Flash scores higher on coding benchmarks: 52.9 versus 40.1 in the Noometry coding category.

### Which has the bigger context window?

DeepSeek V4.1 Flash does, with 1M tokens against 524K.

### How many benchmarks do DeepSeek V4.1 Flash and Solar Pro4 share?

18 benchmarks have published results for both models. DeepSeek V4.1 Flash has 37 scored results on Noometry and Solar Pro4 has 18.