# Phi-4 vs Qwen3.5-Flash

> Qwen3.5-Flash is the stronger model overall, scoring 42.3 to 30.9 on the Noometry Index. Phi-4 costs 2.0× less per token, which makes it the better buy when Qwen3.5-Flash's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/phi-4-vs-qwen3-5-flash
- Last updated: 2026-10-10
- Shared benchmarks: 22

## Summary

- They share 22 benchmarks with published results for both. Phi-4 scores higher in 0 categories and Qwen3.5-Flash in 8 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Qwen3.5-Flash leads 58.2 to 40.7.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 13.8% for Phi-4 and 84.4% for Qwen3.5-Flash.
- Phi-4 is cheaper at $0.07 / $0.14 per million input/output tokens, against $0.10 / $0.40 for Qwen3.5-Flash.
- Qwen3.5-Flash accepts more context: 1M tokens versus 128K.
- Phi-4 has downloadable open weights; the other is API-only.

## Snapshot

| | Phi-4 | Qwen3.5-Flash |
|---|---|---|
| Provider | Microsoft | Alibaba (Qwen) |
| Noometry Index | 30.9 | 42.3 |
| Rank | 269 | 105 |
| Context | 128K | 1M |
| Input $/M | $0.07 | $0.10 |
| Output $/M | $0.14 | $0.40 |
| Weights | Open | Proprietary |

## Coding

- Phi-4: 33.8 (#237)
- Qwen3.5-Flash: 33.9 (#234)

| Benchmark | Phi-4 | Qwen3.5-Flash |
|---|---|---|
| LMArena Coding | 1231 | 1412 |
| LMArena WebDev | — | 1243 |
| BigCodeBench Instruct | 45.5% | — |
| LiveBench Coding | 30.7% | — |
| BigCodeBench Complete | 55.4% | — |
| ALE-Bench | — | 221.8 |

## Agentic & Tool Use

- Phi-4: 22.6 (#120)
- Qwen3.5-Flash: —

| Benchmark | Phi-4 | Qwen3.5-Flash |
|---|---|---|
| Berkeley Function Calling Leaderboard | 28.8% | — |
| BALROG | 11.6% | — |
| Vending-Bench 2 | — | 462.69 |

## Reasoning

- Phi-4: 17.0 (#287)
- Qwen3.5-Flash: 32.9 (#63)

| Benchmark | Phi-4 | Qwen3.5-Flash |
|---|---|---|
| Chess Puzzles | 1% | 21% |
| LMArena Hard Prompts | 1220 | 1404 |
| Epoch Capabilities Index | 130.43 | 143.98 |
| LiveBench Reasoning | 47.8% | — |
| Mystery Game Puzzles | — | 20% |
| DTBench | — | 82.9% |
| LiveBench Data Analysis | 45.2% | — |
| LMCA | — | 29.1% |
| LiveBench | 41.6% | — |

## Math

- Phi-4: 19.6 (#279)
- Qwen3.5-Flash: 36.3 (#117)

| Benchmark | Phi-4 | Qwen3.5-Flash |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 13.8% | 84.4% |
| LMArena Math | 1246 | 1407 |
| FrontierMath (Tiers 1-3) | — | 18.2% |
| LiveBench Math | 42% | — |
| MATH Level 5 | 64.9% | — |
| FrontierMath (Feb 2025 set) | — | 6.2% |
| FrontierMath Tier 4 (v1) | — | 0% |

## Knowledge

- Phi-4: 32.5 (#204)
- Qwen3.5-Flash: 43.2 (#84)

| Benchmark | Phi-4 | Qwen3.5-Flash |
|---|---|---|
| GPQA Diamond | 56.1% | 82.3% |
| Vectara Hallucination Rate | 3.7% | 10.5% |
| LMArena Expert | 1203 | 1408 |
| SimpleQA Verified | — | 20.3% |
| Confabulations | 29.4% | — |
| MMLU | 84.8% | — |

## Multilingual

- Phi-4: 37.4 (#232)
- Qwen3.5-Flash: 50.7 (#116)

| Benchmark | Phi-4 | Qwen3.5-Flash |
|---|---|---|
| LMArena Non-English | 1197 | 1385 |
| LMArena Chinese | 1211 | 1446 |
| LMArena French | 1223 | 1412 |
| LMArena German | 1222 | 1389 |
| LMArena Japanese | 1158 | 1369 |
| LMArena Korean | 1151 | 1344 |
| LMArena Russian | 1209 | 1379 |
| LMArena Spanish | 1234 | 1399 |

## Instruction Following

- Phi-4: 60.6 (#246)
- Qwen3.5-Flash: 72.8 (#133)

| Benchmark | Phi-4 | Qwen3.5-Flash |
|---|---|---|
| LMArena Instruction Following | 1201 | 1374 |
| LiveBench Instruction Following | 58.4% | — |

## Long Context

- Phi-4: 36.9 (#221)
- Qwen3.5-Flash: 42.4 (#119)

| Benchmark | Phi-4 | Qwen3.5-Flash |
|---|---|---|
| LMArena Longer Query | 1217 | 1392 |

## Writing & Preference

- Phi-4: 40.7 (#239)
- Qwen3.5-Flash: 58.2 (#117)

| Benchmark | Phi-4 | Qwen3.5-Flash |
|---|---|---|
| LMArena Text | 1217 | 1397 |
| LMArena Creative Writing | 1182 | 1343 |
| LMArena Multi-Turn | 1206 | 1393 |
| Short-Story Creative Writing | 62.6% | — |
| LiveBench Language | 25.6% | — |

## FAQ

### Is Phi-4 better than Qwen3.5-Flash?

Qwen3.5-Flash is the stronger model overall, scoring 42.3 to 30.9 on the Noometry Index. Phi-4 costs 2.0× less per token, which makes it the better buy when Qwen3.5-Flash's lead doesn't matter for your workload.

### Which is cheaper, Phi-4 or Qwen3.5-Flash?

Phi-4 is cheaper. It lists at $0.07 per million input tokens and $0.14 per million output tokens; Qwen3.5-Flash lists at $0.10 and $0.40.

### Is Phi-4 or Qwen3.5-Flash better for coding?

They score almost the same on coding (33.8 vs 33.9); test both on your own repository before choosing.

### Which has the bigger context window?

Qwen3.5-Flash does, with 1M tokens against 128K.

### How many benchmarks do Phi-4 and Qwen3.5-Flash share?

22 benchmarks have published results for both models. Phi-4 has 37 scored results on Noometry and Qwen3.5-Flash has 32.