# GLM-4.5-Air vs GPT-5.4

> GPT-5.4 is the stronger model overall, scoring 59.4 to 38.9 on the Noometry Index. GLM-4.5-Air costs 13× less per token, which makes it the better buy when GPT-5.4's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/glm-4-5-air-vs-gpt-5-4
- 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-5.4 in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.4 leads 61.8 to 24.1.
- The biggest single-benchmark swing is GSO: 2.9% for GLM-4.5-Air and 31.4% for GPT-5.4.
- GLM-4.5-Air is cheaper at $0.20 / $1.10 per million input/output tokens, against $2.50 / $15 for GPT-5.4.
- GPT-5.4 accepts more context: 1.05M tokens versus 131K.
- GLM-4.5-Air has downloadable open weights; the other is API-only.

## Snapshot

| | GLM-4.5-Air | GPT-5.4 |
|---|---|---|
| Provider | Z.ai (Zhipu) | OpenAI |
| Noometry Index | 38.9 | 59.4 |
| Rank | 177 | 16 |
| Context | 131K | 1.05M |
| Input $/M | $0.20 | $2.50 |
| Output $/M | $1.10 | $15 |
| Weights | Open | Proprietary |

## Coding

- GLM-4.5-Air: 33.3 (#259)
- GPT-5.4: 52.6 (#33)

| Benchmark | GLM-4.5-Air | GPT-5.4 |
|---|---|---|
| GSO | 2.9% | 31.4% |
| LMArena Coding | 1397 | 1497 |
| SWE-bench Verified | — | 76.9% |
| DeepSWE | — | 51.8% |
| LMArena WebDev | — | 1465 |
| SciCode | — | 56.6% |
| WeirdML | — | 77.7% |
| MirrorCode | — | 15.6% |
| ALE-Bench | — | 1,607 |
| AlgoTune | — | 1.85 |

## Agentic & Tool Use

- GLM-4.5-Air: —
- GPT-5.4: 46.5 (#13)

| Benchmark | GLM-4.5-Air | GPT-5.4 |
|---|---|---|
| Terminal-Bench | — | 81.8% |
| APEX-Agents | — | 52.4% |
| τ²-bench Banking | — | 39.4% |
| DeepResearch Bench | — | 35.1% |
| PostTrainBench | — | 19% |
| GBAEval | — | 45.1% |
| LMArena Search | — | 1197 |
| METR Time Horizons | — | 74.3% |
| Vending-Bench 2 | — | 6,144 |

## Reasoning

- GLM-4.5-Air: 24.1 (#166)
- GPT-5.4: 61.8 (#19)

| Benchmark | GLM-4.5-Air | GPT-5.4 |
|---|---|---|
| Kagi LLM Benchmark | 43% | 63.8% |
| LMArena Hard Prompts | 1379 | 1485 |
| ForecastBench | 59.2 | 59.5 |
| ARC-AGI-2 | — | 74% |
| NYT Connections (extended) | — | 91.3% |
| ARC-AGI-1 | — | 93.7% |
| CritPt | — | 23.4% |
| Chess Puzzles | — | 44% |
| EnigmaEval | — | 16% |
| Thematic Generalization | — | 80% |
| EBR-Bench | — | 25.4% |
| Mystery Game Puzzles | — | 37% |
| DTBench | — | 94.4% |
| LMCA | — | 52% |
| Epoch Capabilities Index | — | 156.81 |

## Math

- GLM-4.5-Air: 36.2 (#170)
- GPT-5.4: 73.5 (#19)

| Benchmark | GLM-4.5-Air | GPT-5.4 |
|---|---|---|
| LMArena Math | 1396 | 1488 |
| FrontierMath (Tiers 1-3) | — | 78.6% |
| FrontierMath Tier 4 | — | 49% |
| MathArena Final-Answer Competitions | — | 83.1% |
| OTIS Mock AIME 2024-2025 | — | 97.8% |
| ProofBench | — | 56% |
| Omni-MATH | 39.1% | — |
| FrontierMath (Feb 2025 set) | — | 47.6% |
| FrontierMath Tier 4 (v1) | — | 27.1% |

## Knowledge

- GLM-4.5-Air: 35.0 (#191)
- GPT-5.4: 65.3 (#14)

| Benchmark | GLM-4.5-Air | GPT-5.4 |
|---|---|---|
| Humanity's Last Exam | 8.1% | 36.2% |
| Vectara Hallucination Rate | 9.3% | 7% |
| LMArena Expert | 1370 | 1507 |
| GPQA Diamond | — | 93.3% |
| SimpleQA Verified | — | 45.1% |
| MMLU-Pro | 76.2% | — |
| GPQA (HELM) | 59.4% | — |

## Multimodal

- GLM-4.5-Air: —
- GPT-5.4: 43.7 (#20)

| Benchmark | GLM-4.5-Air | GPT-5.4 |
|---|---|---|
| LMArena Vision | — | 1303 |
| Blueprint-Bench 2 | — | 27.1% |
| Furniture Assembly | — | 37.5% |
| LMArena Document | — | 1471 |

## Multilingual

- GLM-4.5-Air: 49.1 (#135)
- GPT-5.4: 56.2 (#23)

| Benchmark | GLM-4.5-Air | GPT-5.4 |
|---|---|---|
| LMArena Non-English | 1366 | 1465 |
| LMArena Chinese | 1426 | 1519 |
| LMArena French | 1399 | 1493 |
| LMArena German | 1377 | 1472 |
| LMArena Japanese | 1348 | 1485 |
| LMArena Korean | 1308 | 1448 |
| LMArena Russian | 1373 | 1480 |
| LMArena Spanish | 1386 | 1454 |

## Instruction Following

- GLM-4.5-Air: 69.6 (#171)
- GPT-5.4: 77.1 (#27)

| Benchmark | GLM-4.5-Air | GPT-5.4 |
|---|---|---|
| LMArena Instruction Following | 1354 | 1469 |
| IFEval | 81.2% | — |

## Long Context

- GLM-4.5-Air: 41.6 (#135)
- GPT-5.4: 50.3 (#8)

| Benchmark | GLM-4.5-Air | GPT-5.4 |
|---|---|---|
| LMArena Longer Query | 1366 | 1473 |
| CL-bench | — | 27.9% |
| CL-bench Life | — | 21.7% |

## Writing & Preference

- GLM-4.5-Air: 55.9 (#139)
- GPT-5.4: 71.9 (#17)

| Benchmark | GLM-4.5-Air | GPT-5.4 |
|---|---|---|
| LMArena Text | 1384 | 1469 |
| LMArena Creative Writing | 1343 | 1439 |
| LMArena Multi-Turn | 1371 | 1482 |
| EQ-Bench Creative Writing | — | 1840 |
| WildBench | 78.9% | — |
| EQ-Bench 4 | — | 1272 |

## FAQ

### Is GLM-4.5-Air better than GPT-5.4?

GPT-5.4 is the stronger model overall, scoring 59.4 to 38.9 on the Noometry Index. GLM-4.5-Air costs 13× less per token, which makes it the better buy when GPT-5.4's lead doesn't matter for your workload.

### Which is cheaper, GLM-4.5-Air or GPT-5.4?

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 lists at $2.50 and $15.

### Is GLM-4.5-Air or GPT-5.4 better for coding?

GPT-5.4 scores higher on coding benchmarks: 52.6 versus 33.3 in the Noometry coding category.

### Which has the bigger context window?

GPT-5.4 does, with 1.05M tokens against 131K.

### How many benchmarks do GLM-4.5-Air and GPT-5.4 share?

22 benchmarks have published results for both models. GLM-4.5-Air has 27 scored results on Noometry and GPT-5.4 has 68.