Model comparison
Claude 2.1 vs GLM-4.5-Air
GLM-4.5-Air is the stronger model overall, scoring 38.7 to 24.9 on the Noometry Index.
Last verified . 1 shared benchmarks.
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 33.8 to 9.6.
- GLM-4.5-Air has downloadable open weights; the other is API-only.
Side by side
| Claude 2.1 | GLM-4.5-Air | |
|---|---|---|
| Provider | Anthropic | Z.ai (Zhipu) |
| Noometry Index | 24.9 | 38.7 |
| Released | 2023-11-21 | 2025-07-20 |
| Weights | Proprietary | Open |
| Context window | — | 131K |
| Max output | — | 98K |
| Input $ / M tokens | — | $0.20 |
| Output $ / M tokens | — | $1.10 |
| Results tracked | 7 | 27 |
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Category by category
Coding GLM-4.5-Air leads
Claude 2.1: 25.8 (#322), GLM-4.5-Air: 34.5 (#225)
| Benchmark | Claude 2.1 | GLM-4.5-Air |
|---|---|---|
| GSO | — | 2.9% |
| WeirdML | 7.1% | — |
| LMArena Coding | — | 1397 |
Reasoning GLM-4.5-Air leads
Claude 2.1: 20.6 (#216), GLM-4.5-Air: 23.3 (#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 | 119.22 | — |
Math GLM-4.5-Air leads
Claude 2.1: 9.6 (#309), GLM-4.5-Air: 33.8 (#166)
| Benchmark | Claude 2.1 | GLM-4.5-Air |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 1.9% | — |
| Omni-MATH | — | 39.1% |
| LMArena Math | — | 1396 |
Knowledge GLM-4.5-Air leads
Claude 2.1: 15.5 (#287), GLM-4.5-Air: 34.6 (#184)
| 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 Not comparable
Claude 2.1: —, GLM-4.5-Air: 49.4 (#130)
| Benchmark | Claude 2.1 | GLM-4.5-Air |
|---|---|---|
| LMArena Non-English | — | 1366 |
| LMArena Chinese | — | 1427 |
| LMArena French | — | 1399 |
| LMArena German | — | 1376 |
| LMArena Japanese | — | 1348 |
| LMArena Korean | — | 1306 |
| LMArena Russian | — | 1373 |
| LMArena Spanish | — | 1385 |
Instruction Following Not comparable
Claude 2.1: —, GLM-4.5-Air: 69.8 (#165)
| Benchmark | Claude 2.1 | GLM-4.5-Air |
|---|---|---|
| IFEval | — | 81.2% |
| LMArena Instruction Following | — | 1353 |
Long Context Not comparable
Claude 2.1: —, GLM-4.5-Air: 41.6 (#130)
| Benchmark | Claude 2.1 | GLM-4.5-Air |
|---|---|---|
| LMArena Longer Query | — | 1367 |
Writing & Preference Not comparable
Claude 2.1: —, GLM-4.5-Air: 56.1 (#134)
| Benchmark | Claude 2.1 | GLM-4.5-Air |
|---|---|---|
| LMArena Text | — | 1384 |
| LMArena Creative Writing | — | 1343 |
| WildBench | — | 78.9% |
| LMArena Multi-Turn | — | 1371 |
Frequently asked questions
Is Claude 2.1 better than GLM-4.5-Air?
GLM-4.5-Air is the stronger model overall, scoring 38.7 to 24.9 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: 34.5 versus 25.8 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.