Model comparison
GLM-4.5-Air vs GPT-5.2 Pro
GPT-5.2 Pro is the stronger model overall, scoring 52.2 to 38.7 on the Noometry Index. GLM-4.5-Air costs 136× less per token, which makes it the better buy when GPT-5.2 Pro's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in math, where GPT-5.2 Pro leads 64.8 to 33.8.
- GLM-4.5-Air is cheaper at $0.20 / $1.10 per million input/output tokens, against $21 / $168 for GPT-5.2 Pro.
- GPT-5.2 Pro accepts more context: 400K tokens versus 131K.
- GLM-4.5-Air has downloadable open weights; the other is API-only.
Side by side
| GLM-4.5-Air | GPT-5.2 Pro | |
|---|---|---|
| Provider | Z.ai (Zhipu) | OpenAI |
| Noometry Index | 38.7 | 52.2 |
| Released | 2025-07-20 | 2025-12-11 |
| Weights | Open | Proprietary |
| Context window | 131K | 400K |
| Max output | 98K | 128K |
| Input $ / M tokens | $0.20 | $21 |
| Output $ / M tokens | $1.10 | $168 |
| Results tracked | 27 | 8 |
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Category by category
Coding Not comparable
GLM-4.5-Air: 34.5 (#225), GPT-5.2 Pro: —
| Benchmark | GLM-4.5-Air | GPT-5.2 Pro |
|---|---|---|
| GSO | 2.9% | — |
| LMArena Coding | 1397 | — |
Reasoning GPT-5.2 Pro leads
GLM-4.5-Air: 23.3 (#166), GPT-5.2 Pro: 51.8 (#31)
| Benchmark | GLM-4.5-Air | GPT-5.2 Pro |
|---|---|---|
| ARC-AGI-2 | — | 54.2% |
| SimpleBench | — | 57.4% |
| Kagi LLM Benchmark | 43% | — |
| NYT Connections (extended) | — | 79.3% |
| ARC-AGI-1 | — | 90.5% |
| LMArena Hard Prompts | 1379 | — |
| Epoch Capabilities Index | — | 155.41 |
| ForecastBench | 59.2 | — |
Math GPT-5.2 Pro leads
GLM-4.5-Air: 33.8 (#166), GPT-5.2 Pro: 64.8 (#23)
| Benchmark | GLM-4.5-Air | GPT-5.2 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 74% |
| FrontierMath Tier 4 | — | 46% |
| Omni-MATH | 39.1% | — |
| LMArena Math | 1396 | — |
| FrontierMath Tier 4 (v1) | — | 31.3% |
Knowledge Not comparable
GLM-4.5-Air: 34.6 (#184), GPT-5.2 Pro: —
| Benchmark | GLM-4.5-Air | GPT-5.2 Pro |
|---|---|---|
| Humanity's Last Exam | 8.1% | — |
| MMLU-Pro | 76.2% | — |
| Vectara Hallucination Rate | 9.3% | — |
| GPQA (HELM) | 59.4% | — |
| LMArena Expert | 1370 | — |
Multilingual Not comparable
GLM-4.5-Air: 49.4 (#130), GPT-5.2 Pro: —
| Benchmark | GLM-4.5-Air | GPT-5.2 Pro |
|---|---|---|
| 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
GLM-4.5-Air: 69.8 (#165), GPT-5.2 Pro: —
| Benchmark | GLM-4.5-Air | GPT-5.2 Pro |
|---|---|---|
| IFEval | 81.2% | — |
| LMArena Instruction Following | 1353 | — |
Long Context Not comparable
GLM-4.5-Air: 41.6 (#130), GPT-5.2 Pro: —
| Benchmark | GLM-4.5-Air | GPT-5.2 Pro |
|---|---|---|
| LMArena Longer Query | 1367 | — |
Writing & Preference Not comparable
GLM-4.5-Air: 56.1 (#134), GPT-5.2 Pro: —
| Benchmark | GLM-4.5-Air | GPT-5.2 Pro |
|---|---|---|
| LMArena Text | 1384 | — |
| LMArena Creative Writing | 1343 | — |
| WildBench | 78.9% | — |
| LMArena Multi-Turn | 1371 | — |
Frequently asked questions
Is GLM-4.5-Air better than GPT-5.2 Pro?
GPT-5.2 Pro is the stronger model overall, scoring 52.2 to 38.7 on the Noometry Index. GLM-4.5-Air costs 136× less per token, which makes it the better buy when GPT-5.2 Pro's lead doesn't matter for your workload.
Which is cheaper, GLM-4.5-Air or GPT-5.2 Pro?
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 Pro lists at $21 and $168.
Which has the bigger context window?
GPT-5.2 Pro does, with 400K tokens against 131K.
How many benchmarks do GLM-4.5-Air and GPT-5.2 Pro share?
0 benchmarks have published results for both models. GLM-4.5-Air has 27 scored results on Noometry and GPT-5.2 Pro has 8.