# GLM-4.5 vs GPT-5 Nano

> GLM-4.5 is the stronger model overall, scoring 41.4 to 33.4 on the Noometry Index. GPT-5 Nano costs 7.3× less per token, which makes it the better buy when GLM-4.5's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/glm-4-5-vs-gpt-5-nano
- Last updated: 2026-10-10
- Shared benchmarks: 21

## Summary

- They share 21 benchmarks with published results for both. GLM-4.5 scores higher in 6 categories and GPT-5 Nano in 2 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where GLM-4.5 leads 57.7 to 39.4.
- The biggest single-benchmark swing is SWE-bench Verified (bash only): 54.2% for GLM-4.5 and 34.8% for GPT-5 Nano.
- GPT-5 Nano is cheaper at $0.05 / $0.40 per million input/output tokens, against $0.60 / $2.20 for GLM-4.5.
- GPT-5 Nano accepts more context: 400K tokens versus 131K.
- GLM-4.5 has downloadable open weights; the other is API-only.

## Snapshot

| | GLM-4.5 | GPT-5 Nano |
|---|---|---|
| Provider | Z.ai (Zhipu) | OpenAI |
| Noometry Index | 41.4 | 33.4 |
| Rank | 125 | 234 |
| Context | 131K | 400K |
| Input $/M | $0.60 | $0.05 |
| Output $/M | $2.20 | $0.40 |
| Weights | Open | Proprietary |

## Coding

- GLM-4.5: 41.1 (#121)
- GPT-5 Nano: 33.3 (#248)

| Benchmark | GLM-4.5 | GPT-5 Nano |
|---|---|---|
| SWE-bench Verified (bash only) | 54.2% | 34.8% |
| WeirdML | 40.6% | 38.1% |
| LMArena Coding | 1434 | 1351 |
| ALE-Bench | 344.82 | 718.67 |
| AlgoTune | 1.52 | — |

## Agentic & Tool Use

- GLM-4.5: —
- GPT-5 Nano: 25.6 (#99)

| Benchmark | GLM-4.5 | GPT-5 Nano |
|---|---|---|
| Terminal-Bench | — | 21.8% |
| Berkeley Function Calling Leaderboard | — | 51.5% |

## Reasoning

- GLM-4.5: 27.7 (#99)
- GPT-5 Nano: 16.4 (#291)

| Benchmark | GLM-4.5 | GPT-5 Nano |
|---|---|---|
| Kagi LLM Benchmark | 57.9% | 62.2% |
| LMArena Hard Prompts | 1430 | 1329 |
| ARC-AGI-2 | — | 2.6% |
| ARC-AGI-1 | — | 20.7% |
| Chess Puzzles | — | 27% |
| Mystery Game Puzzles | — | 9% |
| DTBench | — | 62.7% |
| LMCA | — | 7.9% |
| Epoch Capabilities Index | — | 139.39 |
| ForecastBench | — | 59.1 |

## Math

- GLM-4.5: 36.3 (#119)
- GPT-5 Nano: 29.1 (#221)

| Benchmark | GLM-4.5 | GPT-5 Nano |
|---|---|---|
| LMArena Math | 1427 | 1318 |
| FrontierMath (Tiers 1-3) | — | 20% |
| FrontierMath Tier 4 | — | 2.4% |
| OTIS Mock AIME 2024-2025 | — | 81.1% |
| ProofBench | — | 12% |
| Omni-MATH | — | 54.6% |
| MATH Level 5 | — | 95.2% |
| FrontierMath (Feb 2025 set) | — | 8.3% |
| FrontierMath Tier 4 (v1) | — | 2.1% |

## Knowledge

- GLM-4.5: 35.5 (#172)
- GPT-5 Nano: 35.8 (#166)

| Benchmark | GLM-4.5 | GPT-5 Nano |
|---|---|---|
| LMArena Expert | 1433 | 1321 |
| GPQA Diamond | — | 69.4% |
| Humanity's Last Exam | 8.3% | — |
| SimpleQA Verified | — | 11.7% |
| MMLU-Pro | — | 77.8% |
| Confabulations | 11.3% | — |
| Vectara Hallucination Rate | — | 10.5% |
| GPQA (HELM) | — | 67.9% |

## Multimodal

- GLM-4.5: —
- GPT-5 Nano: 30.7 (#102)

| Benchmark | GLM-4.5 | GPT-5 Nano |
|---|---|---|
| LMArena Vision | — | 1159 |
| VPCT | — | 37.2% |

## Multilingual

- GLM-4.5: 53.0 (#74)
- GPT-5 Nano: 45.5 (#167)

| Benchmark | GLM-4.5 | GPT-5 Nano |
|---|---|---|
| LMArena Non-English | 1417 | 1313 |
| LMArena Chinese | 1465 | 1355 |
| LMArena German | 1406 | 1329 |
| LMArena Korean | 1382 | 1269 |
| LMArena Russian | 1414 | 1296 |
| LMArena Spanish | 1454 | 1360 |
| LMArena French | 1423 | — |
| LMArena Japanese | 1416 | — |

## Instruction Following

- GLM-4.5: 74.3 (#100)
- GPT-5 Nano: 75.2 (#72)

| Benchmark | GLM-4.5 | GPT-5 Nano |
|---|---|---|
| LMArena Instruction Following | 1405 | 1306 |
| IFEval | — | 93.2% |

## Long Context

- GLM-4.5: 38.2 (#196)
- GPT-5 Nano: 31.3 (#275)

| Benchmark | GLM-4.5 | GPT-5 Nano |
|---|---|---|
| Fiction.LiveBench | 58.3% | 44.4% |
| LMArena Longer Query | 1413 | 1313 |

## Writing & Preference

- GLM-4.5: 57.7 (#121)
- GPT-5 Nano: 39.4 (#244)

| Benchmark | GLM-4.5 | GPT-5 Nano |
|---|---|---|
| LMArena Text | 1430 | 1320 |
| LMArena Creative Writing | 1395 | 1250 |
| EQ-Bench Creative Writing | 1343 | 705 |
| LMArena Multi-Turn | 1415 | 1311 |
| Short-Story Creative Writing | 73.4% | — |
| WildBench | — | 80.6% |

## FAQ

### Is GLM-4.5 better than GPT-5 Nano?

GLM-4.5 is the stronger model overall, scoring 41.4 to 33.4 on the Noometry Index. GPT-5 Nano costs 7.3× less per token, which makes it the better buy when GLM-4.5's lead doesn't matter for your workload.

### Which is cheaper, GLM-4.5 or GPT-5 Nano?

GPT-5 Nano is cheaper. It lists at $0.05 per million input tokens and $0.40 per million output tokens; GLM-4.5 lists at $0.60 and $2.20.

### Is GLM-4.5 or GPT-5 Nano better for coding?

GLM-4.5 scores higher on coding benchmarks: 41.1 versus 33.3 in the Noometry coding category.

### Which has the bigger context window?

GPT-5 Nano does, with 400K tokens against 131K.

### How many benchmarks do GLM-4.5 and GPT-5 Nano share?

21 benchmarks have published results for both models. GLM-4.5 has 27 scored results on Noometry and GPT-5 Nano has 48.