# GLM-4.5-Air vs GPT-5.2

> GPT-5.2 is the stronger model overall, scoring 54.1 to 38.9 on the Noometry Index. GLM-4.5-Air costs 11× less per token, which makes it the better buy when GPT-5.2's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/glm-4-5-air-vs-gpt-5-2
- Last updated: 2026-10-12
- Shared benchmarks: 22

## Summary

- They share 22 benchmarks with published results for both. GLM-4.5-Air scores higher in 0 categories and GPT-5.2 in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.2 leads 50.2 to 24.1.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 43% for GLM-4.5-Air and 73.3% for GPT-5.2.
- GLM-4.5-Air is cheaper at $0.20 / $1.10 per million input/output tokens, against $1.75 / $14 for GPT-5.2.
- GPT-5.2 accepts more context: 400K tokens versus 131K.
- GLM-4.5-Air has downloadable open weights; the other is API-only.

## Snapshot

| | GLM-4.5-Air | GPT-5.2 |
|---|---|---|
| Provider | Z.ai (Zhipu) | OpenAI |
| Noometry Index | 38.9 | 54.1 |
| Rank | 177 | 34 |
| Context | 131K | 400K |
| Input $/M | $0.20 | $1.75 |
| Output $/M | $1.10 | $14 |
| Weights | Open | Proprietary |

## Coding

- GLM-4.5-Air: 33.3 (#259)
- GPT-5.2: 51.6 (#37)

| Benchmark | GLM-4.5-Air | GPT-5.2 |
|---|---|---|
| GSO | 2.9% | 27.4% |
| LMArena Coding | 1397 | 1447 |
| SWE-bench Verified | — | 73.8% |
| SWE-bench Verified (bash only) | — | 72.8% |
| LMArena WebDev | — | 1416 |
| SWE-bench Multilingual | — | 66.7% |
| WeirdML | — | 72.2% |
| ALE-Bench | — | 1,294 |
| AlgoTune | — | 2.05 |

## Agentic & Tool Use

- GLM-4.5-Air: —
- GPT-5.2: 40.2 (#24)

| Benchmark | GLM-4.5-Air | GPT-5.2 |
|---|---|---|
| Terminal-Bench | — | 64.9% |
| Berkeley Function Calling Leaderboard | — | 55.9% |
| GDPval | — | 49.7% |
| Remote Labor Index | — | 2.5% |
| τ²-bench Airline | — | 83% |
| τ²-bench Banking | — | 32.2% |
| τ²-bench Retail | — | 81.6% |
| τ²-bench Telecom | — | 89.7% |
| DeepResearch Bench | — | 41.1% |
| LMArena Search | — | 1207 |
| METR Time Horizons | — | 75.3% |
| Vending-Bench 2 | — | 3,591 |

## Reasoning

- GLM-4.5-Air: 24.1 (#166)
- GPT-5.2: 50.2 (#35)

| Benchmark | GLM-4.5-Air | GPT-5.2 |
|---|---|---|
| Kagi LLM Benchmark | 43% | 73.3% |
| LMArena Hard Prompts | 1379 | 1445 |
| ForecastBench | 59.2 | 60.1 |
| ARC-AGI-2 | — | 52.9% |
| SimpleBench | — | 45.8% |
| NYT Connections (extended) | — | 83.6% |
| ARC-AGI-1 | — | 86.2% |
| Chess Puzzles | — | 49% |
| EnigmaEval | — | 10.4% |
| EBR-Bench | — | 23% |
| Mystery Game Puzzles | — | 23% |
| DTBench | — | 90.9% |
| LMCA | — | 43.9% |
| Epoch Capabilities Index | — | 153.45 |

## Math

- GLM-4.5-Air: 36.2 (#170)
- GPT-5.2: 60.0 (#38)

| Benchmark | GLM-4.5-Air | GPT-5.2 |
|---|---|---|
| LMArena Math | 1396 | 1440 |
| FrontierMath (Tiers 1-3) | — | 67.4% |
| FrontierMath Tier 4 | — | 31.7% |
| MathArena Final-Answer Competitions | — | 72% |
| OTIS Mock AIME 2024-2025 | — | 96.1% |
| ProofBench | — | 15% |
| Omni-MATH | 39.1% | — |
| FrontierMath (Feb 2025 set) | — | 40.7% |
| FrontierMath Tier 4 (v1) | — | 18.8% |

## Knowledge

- GLM-4.5-Air: 35.0 (#191)
- GPT-5.2: 59.3 (#32)

| Benchmark | GLM-4.5-Air | GPT-5.2 |
|---|---|---|
| Humanity's Last Exam | 8.1% | 27.8% |
| Vectara Hallucination Rate | 9.3% | 8.4% |
| LMArena Expert | 1370 | 1445 |
| GPQA Diamond | — | 91.4% |
| SimpleQA Verified | — | 37.1% |
| MMLU-Pro | 76.2% | — |
| GPQA (HELM) | 59.4% | — |

## Multimodal

- GLM-4.5-Air: —
- GPT-5.2: 51.3 (#7)

| Benchmark | GLM-4.5-Air | GPT-5.2 |
|---|---|---|
| LMArena Vision | — | 1268 |
| VPCT | — | 84% |
| Furniture Assembly | — | 38.3% |
| LMArena Document | — | 1405 |

## Multilingual

- GLM-4.5-Air: 49.1 (#135)
- GPT-5.2: 53.4 (#67)

| Benchmark | GLM-4.5-Air | GPT-5.2 |
|---|---|---|
| LMArena Non-English | 1366 | 1425 |
| LMArena Chinese | 1426 | 1460 |
| LMArena French | 1399 | 1455 |
| LMArena German | 1377 | 1448 |
| LMArena Japanese | 1348 | 1420 |
| LMArena Korean | 1308 | 1392 |
| LMArena Russian | 1373 | 1440 |
| LMArena Spanish | 1386 | 1433 |

## Instruction Following

- GLM-4.5-Air: 69.6 (#171)
- GPT-5.2: 74.7 (#89)

| Benchmark | GLM-4.5-Air | GPT-5.2 |
|---|---|---|
| LMArena Instruction Following | 1354 | 1417 |
| IFEval | 81.2% | — |

## Long Context

- GLM-4.5-Air: 41.6 (#135)
- GPT-5.2: 44.0 (#78)

| Benchmark | GLM-4.5-Air | GPT-5.2 |
|---|---|---|
| LMArena Longer Query | 1366 | 1428 |
| CL-bench | — | 18.2% |

## Writing & Preference

- GLM-4.5-Air: 55.9 (#139)
- GPT-5.2: 66.8 (#32)

| Benchmark | GLM-4.5-Air | GPT-5.2 |
|---|---|---|
| LMArena Text | 1384 | 1439 |
| LMArena Creative Writing | 1343 | 1401 |
| LMArena Multi-Turn | 1371 | 1458 |
| EQ-Bench Creative Writing | — | 1703 |
| WildBench | 78.9% | — |

## FAQ

### Is GLM-4.5-Air better than GPT-5.2?

GPT-5.2 is the stronger model overall, scoring 54.1 to 38.9 on the Noometry Index. GLM-4.5-Air costs 11× less per token, which makes it the better buy when GPT-5.2's lead doesn't matter for your workload.

### Which is cheaper, GLM-4.5-Air or GPT-5.2?

GLM-4.5-Air is cheaper. It lists at $0.20 per million input tokens and $1.10 per million output tokens; GPT-5.2 lists at $1.75 and $14.

### Is GLM-4.5-Air or GPT-5.2 better for coding?

GPT-5.2 scores higher on coding benchmarks: 51.6 versus 33.3 in the Noometry coding category.

### Which has the bigger context window?

GPT-5.2 does, with 400K tokens against 131K.

### How many benchmarks do GLM-4.5-Air and GPT-5.2 share?

22 benchmarks have published results for both models. GLM-4.5-Air has 27 scored results on Noometry and GPT-5.2 has 67.