# Phi-4 Mini vs Step 3.5 Flash

> Step 3.5 Flash is the stronger model overall, scoring 42.3 to 30.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/phi-4-mini-vs-step-3-5-flash
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in knowledge, where Step 3.5 Flash leads 39.6 to 25.3.
- Phi-4 Mini is cheaper at $0.075 / $0.30 per million input/output tokens, against $0.10 / $0.30 for Step 3.5 Flash.
- Step 3.5 Flash accepts more context: 256K tokens versus 128K.

## Snapshot

| | Phi-4 Mini | Step 3.5 Flash |
|---|---|---|
| Provider | Microsoft | StepFun |
| Noometry Index | 30.9 | 42.3 |
| Rank | 283 | 116 |
| Context | 128K | 256K |
| Input $/M | $0.075 | $0.10 |
| Output $/M | $0.30 | $0.30 |
| Weights | Open | Open |

## Coding

- Phi-4 Mini: 28.1 (#317)
- Step 3.5 Flash: 42.4 (#105)

| Benchmark | Phi-4 Mini | Step 3.5 Flash |
|---|---|---|
| SciCode | 10.8% | — |
| LMArena Coding | — | 1436 |

## Reasoning

- Phi-4 Mini: 22.4 (#195)
- Step 3.5 Flash: 22.2 (#202)

| Benchmark | Phi-4 Mini | Step 3.5 Flash |
|---|---|---|
| NYT Connections (extended) | — | 28.4% |
| CritPt | 0% | — |
| LMArena Hard Prompts | — | 1411 |

## Math

- Phi-4 Mini: —
- Step 3.5 Flash: 42.6 (#84)

| Benchmark | Phi-4 Mini | Step 3.5 Flash |
|---|---|---|
| MathArena Final-Answer Competitions | — | 66.8% |
| LMArena Math | — | 1408 |

## Knowledge

- Phi-4 Mini: 25.3 (#262)
- Step 3.5 Flash: 39.6 (#132)

| Benchmark | Phi-4 Mini | Step 3.5 Flash |
|---|---|---|
| Vectara Hallucination Rate | 23.5% | — |
| LMArena Expert | — | 1421 |

## Multilingual

- Phi-4 Mini: —
- Step 3.5 Flash: 50.5 (#119)

| Benchmark | Phi-4 Mini | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | — | 1385 |
| LMArena Chinese | — | 1447 |
| LMArena French | — | 1421 |
| LMArena German | — | 1405 |
| LMArena Japanese | — | 1354 |
| LMArena Korean | — | 1352 |
| LMArena Russian | — | 1385 |
| LMArena Spanish | — | 1419 |

## Instruction Following

- Phi-4 Mini: —
- Step 3.5 Flash: 73.1 (#124)

| Benchmark | Phi-4 Mini | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | — | 1385 |

## Long Context

- Phi-4 Mini: —
- Step 3.5 Flash: 42.8 (#117)

| Benchmark | Phi-4 Mini | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | — | 1402 |

## Writing & Preference

- Phi-4 Mini: —
- Step 3.5 Flash: 58.8 (#113)

| Benchmark | Phi-4 Mini | Step 3.5 Flash |
|---|---|---|
| LMArena Text | — | 1403 |
| LMArena Creative Writing | — | 1357 |
| LMArena Multi-Turn | — | 1405 |

## FAQ

### Is Phi-4 Mini better than Step 3.5 Flash?

Step 3.5 Flash is the stronger model overall, scoring 42.3 to 30.9 on the Noometry Index.

### Which is cheaper, Phi-4 Mini or Step 3.5 Flash?

Phi-4 Mini is cheaper. It lists at $0.075 per million input tokens and $0.30 per million output tokens; Step 3.5 Flash lists at $0.10 and $0.30.

### Is Phi-4 Mini or Step 3.5 Flash better for coding?

Step 3.5 Flash scores higher on coding benchmarks: 42.4 versus 28.1 in the Noometry coding category.

### Which has the bigger context window?

Step 3.5 Flash does, with 256K tokens against 128K.

### How many benchmarks do Phi-4 Mini and Step 3.5 Flash share?

0 benchmarks have published results for both models. Phi-4 Mini has 3 scored results on Noometry and Step 3.5 Flash has 19.