# Qwen1.5 4b Chat vs Step 3.5 Flash

> Step 3.5 Flash is the stronger model overall, scoring 42.3 to 28.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/qwen1-5-4b-chat-vs-step-3-5-flash
- Last updated: 2026-10-12
- Shared benchmarks: 13

## Summary

- They share 13 benchmarks with published results for both. Qwen1.5 4b Chat scores higher in 0 categories and Step 3.5 Flash in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Step 3.5 Flash leads 58.8 to 23.8.

## Snapshot

| | Qwen1.5 4b Chat | Step 3.5 Flash |
|---|---|---|
| Provider | Alibaba (Qwen) | StepFun |
| Noometry Index | 28.8 | 42.3 |
| Rank | 322 | 116 |
| Context | — | 256K |
| Input $/M | — | $0.10 |
| Output $/M | — | $0.30 |
| Weights | Open | Open |

## Coding

- Qwen1.5 4b Chat: 29.1 (#308)
- Step 3.5 Flash: 42.4 (#105)

| Benchmark | Qwen1.5 4b Chat | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | 999 | 1436 |

## Reasoning

- Qwen1.5 4b Chat: 18.5 (#279)
- Step 3.5 Flash: 22.2 (#202)

| Benchmark | Qwen1.5 4b Chat | Step 3.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 976 | 1411 |
| NYT Connections (extended) | — | 28.4% |

## Math

- Qwen1.5 4b Chat: 30.4 (#234)
- Step 3.5 Flash: 42.6 (#84)

| Benchmark | Qwen1.5 4b Chat | Step 3.5 Flash |
|---|---|---|
| LMArena Math | 1026 | 1408 |
| MathArena Final-Answer Competitions | — | 66.8% |

## Knowledge

- Qwen1.5 4b Chat: 26.7 (#255)
- Step 3.5 Flash: 39.6 (#132)

| Benchmark | Qwen1.5 4b Chat | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | 980 | 1421 |

## Multilingual

- Qwen1.5 4b Chat: 24.1 (#290)
- Step 3.5 Flash: 50.5 (#119)

| Benchmark | Qwen1.5 4b Chat | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | 979 | 1385 |
| LMArena Chinese | 1024 | 1447 |
| LMArena German | 902 | 1405 |
| LMArena Russian | 952 | 1385 |
| LMArena French | — | 1421 |
| LMArena Japanese | — | 1354 |
| LMArena Korean | — | 1352 |
| LMArena Spanish | — | 1419 |

## Instruction Following

- Qwen1.5 4b Chat: 49.0 (#300)
- Step 3.5 Flash: 73.1 (#124)

| Benchmark | Qwen1.5 4b Chat | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 978 | 1385 |

## Long Context

- Qwen1.5 4b Chat: 30.1 (#290)
- Step 3.5 Flash: 42.8 (#117)

| Benchmark | Qwen1.5 4b Chat | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 988 | 1402 |

## Writing & Preference

- Qwen1.5 4b Chat: 23.8 (#309)
- Step 3.5 Flash: 58.8 (#113)

| Benchmark | Qwen1.5 4b Chat | Step 3.5 Flash |
|---|---|---|
| LMArena Text | 997 | 1403 |
| LMArena Creative Writing | 969 | 1357 |
| LMArena Multi-Turn | 977 | 1405 |

## FAQ

### Is Qwen1.5 4b Chat better than Step 3.5 Flash?

Step 3.5 Flash is the stronger model overall, scoring 42.3 to 28.8 on the Noometry Index.

### Is Qwen1.5 4b Chat or Step 3.5 Flash better for coding?

Step 3.5 Flash scores higher on coding benchmarks: 42.4 versus 29.1 in the Noometry coding category.

### How many benchmarks do Qwen1.5 4b Chat and Step 3.5 Flash share?

13 benchmarks have published results for both models. Qwen1.5 4b Chat has 13 scored results on Noometry and Step 3.5 Flash has 19.