# GLM-4.5V vs gpt-oss-20b

> GLM-4.5V is the stronger model overall, scoring 39.2 to 32.1 on the Noometry Index. gpt-oss-20b costs 25× less per token, which makes it the better buy when GLM-4.5V's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/glm-4-5v-vs-gpt-oss-20b
- Last updated: 2026-10-10
- Shared benchmarks: 14

## Summary

- They share 14 benchmarks with published results for both. GLM-4.5V scores higher in 7 categories and gpt-oss-20b in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where GLM-4.5V leads 52.7 to 35.8.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 59.8% for GLM-4.5V and 53.2% for gpt-oss-20b.
- gpt-oss-20b is cheaper at $0.018 / $0.09 per million input/output tokens, against $0.60 / $1.80 for GLM-4.5V.
- gpt-oss-20b accepts more context: 131K tokens versus 64K.

## Snapshot

| | GLM-4.5V | gpt-oss-20b |
|---|---|---|
| Provider | Z.ai (Zhipu) | OpenAI |
| Noometry Index | 39.2 | 32.1 |
| Rank | 158 | 249 |
| Context | 64K | 131K |
| Input $/M | $0.60 | $0.018 |
| Output $/M | $1.80 | $0.09 |
| Weights | Open | Open |

## Coding

- GLM-4.5V: 38.9 (#152)
- gpt-oss-20b: 37.1 (#185)

| Benchmark | GLM-4.5V | gpt-oss-20b |
|---|---|---|
| LMArena Coding | 1347 | 1307 |
| SciCode | — | 34.4% |
| WeirdML | — | 40.9% |
| ALE-Bench | — | 566.05 |

## Agentic & Tool Use

- GLM-4.5V: —
- gpt-oss-20b: 9.2 (#146)

| Benchmark | GLM-4.5V | gpt-oss-20b |
|---|---|---|
| Terminal-Bench | — | 3.4% |

## Reasoning

- GLM-4.5V: 26.5 (#118)
- gpt-oss-20b: 18.8 (#251)

| Benchmark | GLM-4.5V | gpt-oss-20b |
|---|---|---|
| Kagi LLM Benchmark | 59.8% | 53.2% |
| LMArena Hard Prompts | 1335 | 1274 |
| CritPt | — | 1.4% |
| Chess Puzzles | — | 4% |
| DTBench | — | 68% |
| LMCA | — | 14.5% |
| Epoch Capabilities Index | — | 137.81 |

## Math

- GLM-4.5V: 34.7 (#157)
- gpt-oss-20b: 37.6 (#93)

| Benchmark | GLM-4.5V | gpt-oss-20b |
|---|---|---|
| LMArena Math | 1353 | 1317 |
| OTIS Mock AIME 2024-2025 | — | 65.3% |
| Omni-MATH | — | 56.5% |

## Knowledge

- GLM-4.5V: 36.8 (#155)
- gpt-oss-20b: 34.6 (#186)

| Benchmark | GLM-4.5V | gpt-oss-20b |
|---|---|---|
| LMArena Expert | 1353 | 1258 |
| GPQA Diamond | — | 60.8% |
| MMLU-Pro | — | 74% |
| GPQA (HELM) | — | 59.4% |

## Multimodal

- GLM-4.5V: 33.6 (#86)
- gpt-oss-20b: —

| Benchmark | GLM-4.5V | gpt-oss-20b |
|---|---|---|
| LMArena Vision | 1154 | — |

## Multilingual

- GLM-4.5V: 44.9 (#172)
- gpt-oss-20b: 42.4 (#192)

| Benchmark | GLM-4.5V | gpt-oss-20b |
|---|---|---|
| LMArena Non-English | 1304 | 1269 |
| LMArena Chinese | 1338 | 1311 |
| LMArena Russian | 1299 | 1279 |
| LMArena Spanish | 1335 | 1267 |
| LMArena German | — | 1249 |
| LMArena Japanese | — | 1245 |
| LMArena Korean | — | 1239 |

## Instruction Following

- GLM-4.5V: 69.4 (#170)
- gpt-oss-20b: 62.0 (#235)

| Benchmark | GLM-4.5V | gpt-oss-20b |
|---|---|---|
| LMArena Instruction Following | 1311 | 1236 |
| IFEval | — | 73.2% |

## Long Context

- GLM-4.5V: 39.6 (#166)
- gpt-oss-20b: 37.9 (#203)

| Benchmark | GLM-4.5V | gpt-oss-20b |
|---|---|---|
| LMArena Longer Query | 1305 | 1251 |

## Writing & Preference

- GLM-4.5V: 52.7 (#162)
- gpt-oss-20b: 35.8 (#260)

| Benchmark | GLM-4.5V | gpt-oss-20b |
|---|---|---|
| LMArena Text | 1333 | 1288 |
| LMArena Creative Writing | 1295 | 1201 |
| LMArena Multi-Turn | 1333 | 1268 |
| EQ-Bench Creative Writing | — | 666 |
| WildBench | — | 73.7% |

## FAQ

### Is GLM-4.5V better than gpt-oss-20b?

GLM-4.5V is the stronger model overall, scoring 39.2 to 32.1 on the Noometry Index. gpt-oss-20b costs 25× less per token, which makes it the better buy when GLM-4.5V's lead doesn't matter for your workload.

### Which is cheaper, GLM-4.5V or gpt-oss-20b?

gpt-oss-20b is cheaper. It lists at $0.018 per million input tokens and $0.09 per million output tokens; GLM-4.5V lists at $0.60 and $1.80.

### Is GLM-4.5V or gpt-oss-20b better for coding?

GLM-4.5V scores higher on coding benchmarks: 38.9 versus 37.1 in the Noometry coding category.

### Which has the bigger context window?

gpt-oss-20b does, with 131K tokens against 64K.

### How many benchmarks do GLM-4.5V and gpt-oss-20b share?

14 benchmarks have published results for both models. GLM-4.5V has 15 scored results on Noometry and gpt-oss-20b has 34.