# GLM-4.5-Air vs Sonar

> GLM-4.5-Air and Sonar score almost the same on the Noometry Index (38.9 vs 38.5), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/glm-4-5-air-vs-sonar
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in writing & preference, where GLM-4.5-Air leads 55.9 to 52.6.
- GLM-4.5-Air is cheaper at $0.20 / $1.10 per million input/output tokens, against $1 / $1 for Sonar.
- GLM-4.5-Air accepts more context: 131K tokens versus 128K.
- GLM-4.5-Air has downloadable open weights; the other is API-only.

## Snapshot

| | GLM-4.5-Air | Sonar |
|---|---|---|
| Provider | Z.ai (Zhipu) | Perplexity |
| Noometry Index | 38.9 | 38.5 |
| Rank | 177 | 187 |
| Context | 131K | 128K |
| Input $/M | $0.20 | $1 |
| Output $/M | $1.10 | $1 |
| Weights | Open | Proprietary |

## Coding

- GLM-4.5-Air: 33.3 (#259)
- Sonar: 35.7 (#221)

| Benchmark | GLM-4.5-Air | Sonar |
|---|---|---|
| GSO | 2.9% | — |
| LiveBench Coding | — | 35.1% |
| LMArena Coding | 1397 | — |

## Reasoning

- GLM-4.5-Air: 24.1 (#166)
- Sonar: 21.1 (#227)

| Benchmark | GLM-4.5-Air | Sonar |
|---|---|---|
| Kagi LLM Benchmark | 43% | — |
| LiveBench Reasoning | — | 46.3% |
| LMArena Hard Prompts | 1379 | — |
| LiveBench Data Analysis | — | 37.9% |
| ForecastBench | 59.2 | — |
| LiveBench | — | 46.9% |

## Math

- GLM-4.5-Air: 36.2 (#170)
- Sonar: 33.7 (#200)

| Benchmark | GLM-4.5-Air | Sonar |
|---|---|---|
| Omni-MATH | 39.1% | — |
| LiveBench Math | — | 41.6% |
| LMArena Math | 1396 | — |

## Knowledge

- GLM-4.5-Air: 35.0 (#191)
- Sonar: —

| Benchmark | GLM-4.5-Air | Sonar |
|---|---|---|
| Humanity's Last Exam | 8.1% | — |
| MMLU-Pro | 76.2% | — |
| Vectara Hallucination Rate | 9.3% | — |
| GPQA (HELM) | 59.4% | — |
| LMArena Expert | 1370 | — |

## Multilingual

- GLM-4.5-Air: 49.1 (#135)
- Sonar: —

| Benchmark | GLM-4.5-Air | Sonar |
|---|---|---|
| LMArena Non-English | 1366 | — |
| LMArena Chinese | 1426 | — |
| LMArena French | 1399 | — |
| LMArena German | 1377 | — |
| LMArena Japanese | 1348 | — |
| LMArena Korean | 1308 | — |
| LMArena Russian | 1373 | — |
| LMArena Spanish | 1386 | — |

## Instruction Following

- GLM-4.5-Air: 69.6 (#171)
- Sonar: 71.4 (#150)

| Benchmark | GLM-4.5-Air | Sonar |
|---|---|---|
| LiveBench Instruction Following | — | 76.2% |
| IFEval | 81.2% | — |
| LMArena Instruction Following | 1354 | — |

## Long Context

- GLM-4.5-Air: 41.6 (#135)
- Sonar: —

| Benchmark | GLM-4.5-Air | Sonar |
|---|---|---|
| LMArena Longer Query | 1366 | — |

## Writing & Preference

- GLM-4.5-Air: 55.9 (#139)
- Sonar: 52.6 (#167)

| Benchmark | GLM-4.5-Air | Sonar |
|---|---|---|
| LMArena Text | 1384 | — |
| LMArena Creative Writing | 1343 | — |
| WildBench | 78.9% | — |
| LMArena Multi-Turn | 1371 | — |
| LiveBench Language | — | 44.1% |

## FAQ

### Is GLM-4.5-Air better than Sonar?

GLM-4.5-Air and Sonar score almost the same on the Noometry Index (38.9 vs 38.5), so choose on price, context window or the category you care about most.

### Which is cheaper, GLM-4.5-Air or Sonar?

GLM-4.5-Air is cheaper. It lists at $0.20 per million input tokens and $1.10 per million output tokens; Sonar lists at $1 and $1.

### Is GLM-4.5-Air or Sonar better for coding?

Sonar scores higher on coding benchmarks: 35.7 versus 33.3 in the Noometry coding category.

### Which has the bigger context window?

GLM-4.5-Air does, with 131K tokens against 128K.

### How many benchmarks do GLM-4.5-Air and Sonar share?

0 benchmarks have published results for both models. GLM-4.5-Air has 27 scored results on Noometry and Sonar has 7.