# gpt-oss-20b vs Hy4 preview

> Hy4 preview is the stronger model overall, scoring 45.3 to 32.5 on the Noometry Index. gpt-oss-20b costs 35× less per token, which makes it the better buy when Hy4 preview's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-oss-20b-vs-hy4-preview
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where Hy4 preview leads 55.7 to 39.4.
- gpt-oss-20b is cheaper at $0.018 / $0.09 per million input/output tokens, against $0.83 / $2.50 for Hy4 preview.
- Hy4 preview accepts more context: 1.05M tokens versus 131K.

## Snapshot

| | gpt-oss-20b | Hy4 preview |
|---|---|---|
| Provider | OpenAI | Tencent |
| Noometry Index | 32.5 | 45.3 |
| Rank | 255 | 73 |
| Context | 131K | 1.05M |
| Input $/M | $0.018 | $0.83 |
| Output $/M | $0.09 | $2.50 |
| Weights | Open | Open |

## Coding

- gpt-oss-20b: 37.6 (#192)
- Hy4 preview: 51.6 (#38)

| Benchmark | gpt-oss-20b | Hy4 preview |
|---|---|---|
| LMArena WebDev | — | 1632 |
| SciCode | 34.4% | — |
| WeirdML | 40.9% | — |
| LMArena Coding | 1306 | — |
| ALE-Bench | 566.05 | — |

## Agentic & Tool Use

- gpt-oss-20b: 9.3 (#154)
- Hy4 preview: —

| Benchmark | gpt-oss-20b | Hy4 preview |
|---|---|---|
| Terminal-Bench | 3.4% | — |

## Reasoning

- gpt-oss-20b: 19.3 (#261)
- Hy4 preview: 31.9 (#79)

| Benchmark | gpt-oss-20b | Hy4 preview |
|---|---|---|
| Kagi LLM Benchmark | 53.2% | — |
| NYT Connections (extended) | — | 68.2% |
| CritPt | 1.4% | — |
| Chess Puzzles | 4% | — |
| LMArena Hard Prompts | 1274 | — |
| DTBench | 68% | — |
| LMCA | 14.5% | — |
| Epoch Capabilities Index | 137.82 | — |

## Math

- gpt-oss-20b: 39.4 (#103)
- Hy4 preview: 55.7 (#42)

| Benchmark | gpt-oss-20b | Hy4 preview |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 65.3% | — |
| ProofBench | — | 75% |
| Omni-MATH | 56.5% | — |
| LMArena Math | 1317 | — |

## Knowledge

- gpt-oss-20b: 34.6 (#195)
- Hy4 preview: —

| Benchmark | gpt-oss-20b | Hy4 preview |
|---|---|---|
| GPQA Diamond | 60.8% | — |
| MMLU-Pro | 74% | — |
| GPQA (HELM) | 59.4% | — |
| LMArena Expert | 1258 | — |

## Multilingual

- gpt-oss-20b: 42.2 (#197)
- Hy4 preview: —

| Benchmark | gpt-oss-20b | Hy4 preview |
|---|---|---|
| LMArena Non-English | 1268 | — |
| LMArena Chinese | 1314 | — |
| LMArena German | 1255 | — |
| LMArena Japanese | 1244 | — |
| LMArena Korean | 1236 | — |
| LMArena Russian | 1278 | — |
| LMArena Spanish | 1267 | — |

## Instruction Following

- gpt-oss-20b: 61.8 (#240)
- Hy4 preview: —

| Benchmark | gpt-oss-20b | Hy4 preview |
|---|---|---|
| IFEval | 73.2% | — |
| LMArena Instruction Following | 1236 | — |

## Long Context

- gpt-oss-20b: 37.9 (#209)
- Hy4 preview: —

| Benchmark | gpt-oss-20b | Hy4 preview |
|---|---|---|
| LMArena Longer Query | 1250 | — |

## Writing & Preference

- gpt-oss-20b: 35.5 (#265)
- Hy4 preview: —

| Benchmark | gpt-oss-20b | Hy4 preview |
|---|---|---|
| LMArena Text | 1287 | — |
| LMArena Creative Writing | 1201 | — |
| EQ-Bench Creative Writing | 666 | — |
| WildBench | 73.7% | — |
| LMArena Multi-Turn | 1268 | — |

## FAQ

### Is gpt-oss-20b better than Hy4 preview?

Hy4 preview is the stronger model overall, scoring 45.3 to 32.5 on the Noometry Index. gpt-oss-20b costs 35× less per token, which makes it the better buy when Hy4 preview's lead doesn't matter for your workload.

### Which is cheaper, gpt-oss-20b or Hy4 preview?

gpt-oss-20b is cheaper. It lists at $0.018 per million input tokens and $0.09 per million output tokens; Hy4 preview lists at $0.83 and $2.50.

### Is gpt-oss-20b or Hy4 preview better for coding?

Hy4 preview scores higher on coding benchmarks: 51.6 versus 37.6 in the Noometry coding category.

### Which has the bigger context window?

Hy4 preview does, with 1.05M tokens against 131K.

### How many benchmarks do gpt-oss-20b and Hy4 preview share?

0 benchmarks have published results for both models. gpt-oss-20b has 34 scored results on Noometry and Hy4 preview has 3.