# Qwen3.5-Flash vs Solar Pro4

> Qwen3.5-Flash and Solar Pro4 score almost the same on the Noometry Index (42.3 vs 41.5), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/qwen3-5-flash-vs-solar-pro4
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Qwen3.5-Flash scores higher in 6 categories and Solar Pro4 in 2 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in coding, where Solar Pro4 leads 39.9 to 33.9.
- Qwen3.5-Flash is cheaper at $0.10 / $0.40 per million input/output tokens, against $0.30 / $1.20 for Solar Pro4.
- Qwen3.5-Flash accepts more context: 1M tokens versus 524K.

## Snapshot

| | Qwen3.5-Flash | Solar Pro4 |
|---|---|---|
| Provider | Alibaba (Qwen) | Upstage |
| Noometry Index | 42.3 | 41.5 |
| Rank | 105 | 123 |
| Context | 1M | 524K |
| Input $/M | $0.10 | $0.30 |
| Output $/M | $0.40 | $1.20 |
| Weights | Proprietary | Proprietary |

## Coding

- Qwen3.5-Flash: 33.9 (#234)
- Solar Pro4: 39.9 (#135)

| Benchmark | Qwen3.5-Flash | Solar Pro4 |
|---|---|---|
| LMArena WebDev | 1243 | 1371 |
| LMArena Coding | 1412 | 1439 |
| ALE-Bench | 221.8 | — |

## Agentic & Tool Use

- Qwen3.5-Flash: —
- Solar Pro4: —

| Benchmark | Qwen3.5-Flash | Solar Pro4 |
|---|---|---|
| Vending-Bench 2 | 462.69 | — |

## Reasoning

- Qwen3.5-Flash: 32.9 (#63)
- Solar Pro4: 27.3 (#107)

| Benchmark | Qwen3.5-Flash | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1404 | 1398 |
| Chess Puzzles | 21% | — |
| Mystery Game Puzzles | 20% | — |
| DTBench | 82.9% | — |
| LMCA | 29.1% | — |
| Epoch Capabilities Index | 143.98 | — |

## Math

- Qwen3.5-Flash: 36.3 (#117)
- Solar Pro4: 36.1 (#129)

| Benchmark | Qwen3.5-Flash | Solar Pro4 |
|---|---|---|
| LMArena Math | 1407 | 1418 |
| FrontierMath (Tiers 1-3) | 18.2% | — |
| OTIS Mock AIME 2024-2025 | 84.4% | — |
| FrontierMath (Feb 2025 set) | 6.2% | — |
| FrontierMath Tier 4 (v1) | 0% | — |

## Knowledge

- Qwen3.5-Flash: 43.2 (#84)
- Solar Pro4: 39.0 (#128)

| Benchmark | Qwen3.5-Flash | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1408 | 1421 |
| GPQA Diamond | 82.3% | — |
| SimpleQA Verified | 20.3% | — |
| Vectara Hallucination Rate | 10.5% | — |

## Multilingual

- Qwen3.5-Flash: 50.7 (#116)
- Solar Pro4: 49.0 (#134)

| Benchmark | Qwen3.5-Flash | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1385 | 1362 |
| LMArena Chinese | 1446 | 1417 |
| LMArena French | 1412 | 1403 |
| LMArena German | 1389 | 1351 |
| LMArena Japanese | 1369 | 1300 |
| LMArena Korean | 1344 | 1383 |
| LMArena Russian | 1379 | 1360 |
| LMArena Spanish | 1399 | 1408 |

## Instruction Following

- Qwen3.5-Flash: 72.8 (#133)
- Solar Pro4: 72.8 (#128)

| Benchmark | Qwen3.5-Flash | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1374 | 1376 |

## Long Context

- Qwen3.5-Flash: 42.4 (#119)
- Solar Pro4: 42.0 (#125)

| Benchmark | Qwen3.5-Flash | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1392 | 1379 |

## Writing & Preference

- Qwen3.5-Flash: 58.2 (#117)
- Solar Pro4: 56.7 (#133)

| Benchmark | Qwen3.5-Flash | Solar Pro4 |
|---|---|---|
| LMArena Text | 1397 | 1386 |
| LMArena Creative Writing | 1343 | 1313 |
| LMArena Multi-Turn | 1393 | 1391 |

## FAQ

### Is Qwen3.5-Flash better than Solar Pro4?

Qwen3.5-Flash and Solar Pro4 score almost the same on the Noometry Index (42.3 vs 41.5), so choose on price, context window or the category you care about most.

### Which is cheaper, Qwen3.5-Flash or Solar Pro4?

Qwen3.5-Flash is cheaper. It lists at $0.10 per million input tokens and $0.40 per million output tokens; Solar Pro4 lists at $0.30 and $1.20.

### Is Qwen3.5-Flash or Solar Pro4 better for coding?

Solar Pro4 scores higher on coding benchmarks: 39.9 versus 33.9 in the Noometry coding category.

### Which has the bigger context window?

Qwen3.5-Flash does, with 1M tokens against 524K.

### How many benchmarks do Qwen3.5-Flash and Solar Pro4 share?

18 benchmarks have published results for both models. Qwen3.5-Flash has 32 scored results on Noometry and Solar Pro4 has 18.