# Claude 2.1 vs GLM-4.5-Air

> GLM-4.5-Air is the stronger model overall, scoring 38.9 to 25.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-2-1-vs-glm-4-5-air
- Last updated: 2026-10-12
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. Claude 2.1 scores higher in 0 categories and GLM-4.5-Air in 4 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in math, where GLM-4.5-Air leads 36.2 to 10.2.
- GLM-4.5-Air has downloadable open weights; the other is API-only.

## Snapshot

| | Claude 2.1 | GLM-4.5-Air |
|---|---|---|
| Provider | Anthropic | Z.ai (Zhipu) |
| Noometry Index | 25.2 | 38.9 |
| Rank | 345 | 177 |
| Context | — | 131K |
| Input $/M | — | $0.20 |
| Output $/M | — | $1.10 |
| Weights | Proprietary | Open |

## Coding

- Claude 2.1: 26.2 (#327)
- GLM-4.5-Air: 33.3 (#259)

| Benchmark | Claude 2.1 | GLM-4.5-Air |
|---|---|---|
| GSO | — | 2.9% |
| WeirdML | 7.1% | — |
| LMArena Coding | — | 1397 |

## Reasoning

- Claude 2.1: 21.4 (#221)
- GLM-4.5-Air: 24.1 (#166)

| Benchmark | Claude 2.1 | GLM-4.5-Air |
|---|---|---|
| ForecastBench | 54.2 | 59.2 |
| Kagi LLM Benchmark | — | 43% |
| LMArena Hard Prompts | — | 1379 |
| DTBench | 51% | — |
| Epoch Capabilities Index | 119.27 | — |

## Math

- Claude 2.1: 10.2 (#315)
- GLM-4.5-Air: 36.2 (#170)

| Benchmark | Claude 2.1 | GLM-4.5-Air |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 1.9% | — |
| Omni-MATH | — | 39.1% |
| LMArena Math | — | 1396 |

## Knowledge

- Claude 2.1: 15.4 (#292)
- GLM-4.5-Air: 35.0 (#191)

| Benchmark | Claude 2.1 | GLM-4.5-Air |
|---|---|---|
| GPQA Diamond | 33% | — |
| Humanity's Last Exam | — | 8.1% |
| MMLU-Pro | — | 76.2% |
| Vectara Hallucination Rate | — | 9.3% |
| GPQA (HELM) | — | 59.4% |
| LMArena Expert | — | 1370 |
| MMLU | 73.5% | — |

## Multilingual

- Claude 2.1: —
- GLM-4.5-Air: 49.1 (#135)

| Benchmark | Claude 2.1 | GLM-4.5-Air |
|---|---|---|
| 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

- Claude 2.1: —
- GLM-4.5-Air: 69.6 (#171)

| Benchmark | Claude 2.1 | GLM-4.5-Air |
|---|---|---|
| IFEval | — | 81.2% |
| LMArena Instruction Following | — | 1354 |

## Long Context

- Claude 2.1: —
- GLM-4.5-Air: 41.6 (#135)

| Benchmark | Claude 2.1 | GLM-4.5-Air |
|---|---|---|
| LMArena Longer Query | — | 1366 |

## Writing & Preference

- Claude 2.1: —
- GLM-4.5-Air: 55.9 (#139)

| Benchmark | Claude 2.1 | GLM-4.5-Air |
|---|---|---|
| LMArena Text | — | 1384 |
| LMArena Creative Writing | — | 1343 |
| WildBench | — | 78.9% |
| LMArena Multi-Turn | — | 1371 |

## FAQ

### Is Claude 2.1 better than GLM-4.5-Air?

GLM-4.5-Air is the stronger model overall, scoring 38.9 to 25.2 on the Noometry Index.

### Is Claude 2.1 or GLM-4.5-Air better for coding?

GLM-4.5-Air scores higher on coding benchmarks: 33.3 versus 26.2 in the Noometry coding category.

### How many benchmarks do Claude 2.1 and GLM-4.5-Air share?

1 benchmark has published results for both models. Claude 2.1 has 7 scored results on Noometry and GLM-4.5-Air has 27.