# Qwen3.5 Plus vs Sonar

> Qwen3.5 Plus is the stronger model overall, scoring 42.9 to 38.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/qwen3-5-plus-vs-sonar
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where Qwen3.5 Plus leads 49.6 to 33.7.
- Qwen3.5 Plus is cheaper at $0.40 / $2.40 per million input/output tokens, against $1 / $1 for Sonar.
- Qwen3.5 Plus accepts more context: 1M tokens versus 128K.

## Snapshot

| | Qwen3.5 Plus | Sonar |
|---|---|---|
| Provider | Alibaba (Qwen) | Perplexity |
| Noometry Index | 42.9 | 38.5 |
| Rank | 106 | 187 |
| Context | 1M | 128K |
| Input $/M | $0.40 | $1 |
| Output $/M | $2.40 | $1 |
| Weights | Proprietary | Proprietary |

## Coding

- Qwen3.5 Plus: —
- Sonar: 35.7 (#221)

| Benchmark | Qwen3.5 Plus | Sonar |
|---|---|---|
| LiveBench Coding | — | 35.1% |
| ALE-Bench | 621.92 | — |

## Agentic & Tool Use

- Qwen3.5 Plus: —
- Sonar: —

| Benchmark | Qwen3.5 Plus | Sonar |
|---|---|---|
| Vending-Bench 2 | 0.54 | — |

## Reasoning

- Qwen3.5 Plus: 32.8 (#74)
- Sonar: 21.1 (#227)

| Benchmark | Qwen3.5 Plus | Sonar |
|---|---|---|
| Chess Puzzles | 22% | — |
| LiveBench Reasoning | — | 46.3% |
| Mystery Game Puzzles | 17% | — |
| DTBench | 80.5% | — |
| LiveBench Data Analysis | — | 37.9% |
| LMCA | 36.4% | — |
| Epoch Capabilities Index | 146.78 | — |
| LiveBench | — | 46.9% |

## Math

- Qwen3.5 Plus: 49.6 (#61)
- Sonar: 33.7 (#200)

| Benchmark | Qwen3.5 Plus | Sonar |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 86.7% | — |
| LiveBench Math | — | 41.6% |
| FrontierMath (Feb 2025 set) | 21% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |

## Knowledge

- Qwen3.5 Plus: 46.0 (#83)
- Sonar: —

| Benchmark | Qwen3.5 Plus | Sonar |
|---|---|---|
| GPQA Diamond | 84.8% | — |
| SimpleQA Verified | 25.4% | — |
| Vectara Hallucination Rate | 10.7% | — |

## Instruction Following

- Qwen3.5 Plus: —
- Sonar: 71.4 (#150)

| Benchmark | Qwen3.5 Plus | Sonar |
|---|---|---|
| LiveBench Instruction Following | — | 76.2% |

## Long Context

- Qwen3.5 Plus: 43.0 (#113)
- Sonar: —

| Benchmark | Qwen3.5 Plus | Sonar |
|---|---|---|
| CL-bench | 19.8% | — |
| CL-bench Life | 12.4% | — |

## Writing & Preference

- Qwen3.5 Plus: —
- Sonar: 52.6 (#167)

| Benchmark | Qwen3.5 Plus | Sonar |
|---|---|---|
| LiveBench Language | — | 44.1% |

## FAQ

### Is Qwen3.5 Plus better than Sonar?

Qwen3.5 Plus is the stronger model overall, scoring 42.9 to 38.5 on the Noometry Index.

### Which is cheaper, Qwen3.5 Plus or Sonar?

Qwen3.5 Plus is cheaper. It lists at $0.40 per million input tokens and $2.40 per million output tokens; Sonar lists at $1 and $1.

### Which has the bigger context window?

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

### How many benchmarks do Qwen3.5 Plus and Sonar share?

0 benchmarks have published results for both models. Qwen3.5 Plus has 15 scored results on Noometry and Sonar has 7.