Model comparison
GLM-4.5-Air vs GPT-5.4 Pro
GPT-5.4 Pro is the stronger model overall, scoring 58.8 to 38.7 on the Noometry Index. GLM-4.5-Air costs 159× less per token, which makes it the better buy when GPT-5.4 Pro's lead doesn't matter for your workload.
Last verified . 2 shared benchmarks.
Summary
- They share 2 benchmarks with published results for both. GLM-4.5-Air scores higher in 0 categories and GPT-5.4 Pro in 4 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.4 Pro leads 71.0 to 23.3.
- The biggest single-benchmark swing is Humanity's Last Exam: 8.1% for GLM-4.5-Air and 44.3% for GPT-5.4 Pro.
- GLM-4.5-Air is cheaper at $0.20 / $1.10 per million input/output tokens, against $30 / $180 for GPT-5.4 Pro.
- GPT-5.4 Pro accepts more context: 1.05M tokens versus 131K.
- GLM-4.5-Air has downloadable open weights; the other is API-only.
Side by side
| GLM-4.5-Air | GPT-5.4 Pro | |
|---|---|---|
| Provider | Z.ai (Zhipu) | OpenAI |
| Noometry Index | 38.7 | 58.8 |
| Released | 2025-07-20 | 2026-03-05 |
| Weights | Open | Proprietary |
| Context window | 131K | 1.05M |
| Max output | 98K | 128K |
| Input $ / M tokens | $0.20 | $30 |
| Output $ / M tokens | $1.10 | $180 |
| Results tracked | 27 | 16 |
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Category by category
Coding GPT-5.4 Pro leads
GLM-4.5-Air: 34.5 (#225), GPT-5.4 Pro: 42.6 (#89)
| Benchmark | GLM-4.5-Air | GPT-5.4 Pro |
|---|---|---|
| GSO | 2.9% | — |
| WeirdML | — | 57.4% |
| LMArena Coding | 1397 | — |
Reasoning GPT-5.4 Pro leads
GLM-4.5-Air: 23.3 (#166), GPT-5.4 Pro: 71.0 (#10)
| Benchmark | GLM-4.5-Air | GPT-5.4 Pro |
|---|---|---|
| ARC-AGI-2 | — | 83.3% |
| SimpleBench | — | 74.1% |
| Kagi LLM Benchmark | 43% | — |
| ARC-AGI-1 | — | 94.5% |
| CritPt | — | 30% |
| Chess Puzzles | — | 58.6% |
| EnigmaEval | — | 23.8% |
| LMArena Hard Prompts | 1379 | — |
| Epoch Capabilities Index | — | 159.12 |
| ForecastBench | 59.2 | — |
Math GPT-5.4 Pro leads
GLM-4.5-Air: 33.8 (#166), GPT-5.4 Pro: 72.0 (#17)
| Benchmark | GLM-4.5-Air | GPT-5.4 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 82.5% |
| FrontierMath Tier 4 | — | 58.5% |
| Omni-MATH | 39.1% | — |
| LMArena Math | 1396 | — |
| FrontierMath (Feb 2025 set) | — | 50% |
| FrontierMath Tier 4 (v1) | — | 37.5% |
Knowledge GPT-5.4 Pro leads
GLM-4.5-Air: 34.6 (#184), GPT-5.4 Pro: 68.3 (#6)
| Benchmark | GLM-4.5-Air | GPT-5.4 Pro |
|---|---|---|
| Humanity's Last Exam | 8.1% | 44.3% |
| Vectara Hallucination Rate | 9.3% | 8.3% |
| GPQA Diamond | — | 94.6% |
| SimpleQA Verified | — | 46.3% |
| MMLU-Pro | 76.2% | — |
| GPQA (HELM) | 59.4% | — |
| LMArena Expert | 1370 | — |
Multilingual Not comparable
GLM-4.5-Air: 49.4 (#130), GPT-5.4 Pro: —
| Benchmark | GLM-4.5-Air | GPT-5.4 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-5.4 Pro: —
| Benchmark | GLM-4.5-Air | GPT-5.4 Pro |
|---|---|---|
| IFEval | 81.2% | — |
| LMArena Instruction Following | 1353 | — |
Long Context Not comparable
GLM-4.5-Air: 41.6 (#130), GPT-5.4 Pro: —
| Benchmark | GLM-4.5-Air | GPT-5.4 Pro |
|---|---|---|
| LMArena Longer Query | 1367 | — |
Writing & Preference Not comparable
GLM-4.5-Air: 56.1 (#134), GPT-5.4 Pro: —
| Benchmark | GLM-4.5-Air | GPT-5.4 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-5.4 Pro?
GPT-5.4 Pro is the stronger model overall, scoring 58.8 to 38.7 on the Noometry Index. GLM-4.5-Air costs 159× less per token, which makes it the better buy when GPT-5.4 Pro's lead doesn't matter for your workload.
Which is cheaper, GLM-4.5-Air or GPT-5.4 Pro?
GLM-4.5-Air is cheaper. It lists at $0.20 per million input tokens and $1.10 per million output tokens; GPT-5.4 Pro lists at $30 and $180.
Is GLM-4.5-Air or GPT-5.4 Pro better for coding?
GPT-5.4 Pro scores higher on coding benchmarks: 42.6 versus 34.5 in the Noometry coding category.
Which has the bigger context window?
GPT-5.4 Pro does, with 1.05M tokens against 131K.
How many benchmarks do GLM-4.5-Air and GPT-5.4 Pro share?
2 benchmarks have published results for both models. GLM-4.5-Air has 27 scored results on Noometry and GPT-5.4 Pro has 16.