# GPT-5 Nano vs Hy4 preview

> Hy4 preview is the stronger model overall, scoring 44.6 to 33.4 on the Noometry Index. GPT-5 Nano costs 9.1× 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-5-nano-vs-hy4-preview
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. GPT-5 Nano scores higher in 0 categories and Hy4 preview in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where Hy4 preview leads 54.5 to 29.1.
- The biggest single-benchmark swing is ProofBench: 12% for GPT-5 Nano and 75% for Hy4 preview.
- GPT-5 Nano is cheaper at $0.05 / $0.40 per million input/output tokens, against $0.83 / $2.50 for Hy4 preview.
- Hy4 preview accepts more context: 1.05M tokens versus 400K.
- Hy4 preview has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5 Nano | Hy4 preview |
|---|---|---|
| Provider | OpenAI | Tencent |
| Noometry Index | 33.4 | 44.6 |
| Rank | 234 | 73 |
| Context | 400K | 1.05M |
| Input $/M | $0.05 | $0.83 |
| Output $/M | $0.40 | $2.50 |
| Weights | Proprietary | Open |

## Coding

- GPT-5 Nano: 33.3 (#248)
- Hy4 preview: 51.4 (#36)

| Benchmark | GPT-5 Nano | Hy4 preview |
|---|---|---|
| SWE-bench Verified (bash only) | 34.8% | — |
| LMArena WebDev | — | 1633 |
| WeirdML | 38.1% | — |
| LMArena Coding | 1351 | — |
| ALE-Bench | 718.67 | — |

## Agentic & Tool Use

- GPT-5 Nano: 25.6 (#99)
- Hy4 preview: —

| Benchmark | GPT-5 Nano | Hy4 preview |
|---|---|---|
| Terminal-Bench | 21.8% | — |
| Berkeley Function Calling Leaderboard | 51.5% | — |

## Reasoning

- GPT-5 Nano: 16.4 (#291)
- Hy4 preview: 30.6 (#75)

| Benchmark | GPT-5 Nano | Hy4 preview |
|---|---|---|
| ARC-AGI-2 | 2.6% | — |
| Kagi LLM Benchmark | 62.2% | — |
| NYT Connections (extended) | — | 68.2% |
| ARC-AGI-1 | 20.7% | — |
| Chess Puzzles | 27% | — |
| LMArena Hard Prompts | 1329 | — |
| Mystery Game Puzzles | 9% | — |
| DTBench | 62.7% | — |
| LMCA | 7.9% | — |
| Epoch Capabilities Index | 139.39 | — |
| ForecastBench | 59.1 | — |

## Math

- GPT-5 Nano: 29.1 (#221)
- Hy4 preview: 54.5 (#37)

| Benchmark | GPT-5 Nano | Hy4 preview |
|---|---|---|
| ProofBench | 12% | 75% |
| FrontierMath (Tiers 1-3) | 20% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 81.1% | — |
| Omni-MATH | 54.6% | — |
| LMArena Math | 1318 | — |
| MATH Level 5 | 95.2% | — |
| FrontierMath (Feb 2025 set) | 8.3% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |

## Knowledge

- GPT-5 Nano: 35.8 (#166)
- Hy4 preview: —

| Benchmark | GPT-5 Nano | Hy4 preview |
|---|---|---|
| GPQA Diamond | 69.4% | — |
| SimpleQA Verified | 11.7% | — |
| MMLU-Pro | 77.8% | — |
| Vectara Hallucination Rate | 10.5% | — |
| GPQA (HELM) | 67.9% | — |
| LMArena Expert | 1321 | — |

## Multimodal

- GPT-5 Nano: 30.7 (#102)
- Hy4 preview: —

| Benchmark | GPT-5 Nano | Hy4 preview |
|---|---|---|
| LMArena Vision | 1159 | — |
| VPCT | 37.2% | — |

## Multilingual

- GPT-5 Nano: 45.5 (#167)
- Hy4 preview: —

| Benchmark | GPT-5 Nano | Hy4 preview |
|---|---|---|
| LMArena Non-English | 1313 | — |
| LMArena Chinese | 1355 | — |
| LMArena German | 1329 | — |
| LMArena Korean | 1269 | — |
| LMArena Russian | 1296 | — |
| LMArena Spanish | 1360 | — |

## Instruction Following

- GPT-5 Nano: 75.2 (#72)
- Hy4 preview: —

| Benchmark | GPT-5 Nano | Hy4 preview |
|---|---|---|
| IFEval | 93.2% | — |
| LMArena Instruction Following | 1306 | — |

## Long Context

- GPT-5 Nano: 31.3 (#275)
- Hy4 preview: —

| Benchmark | GPT-5 Nano | Hy4 preview |
|---|---|---|
| Fiction.LiveBench | 44.4% | — |
| LMArena Longer Query | 1313 | — |

## Writing & Preference

- GPT-5 Nano: 39.4 (#244)
- Hy4 preview: —

| Benchmark | GPT-5 Nano | Hy4 preview |
|---|---|---|
| LMArena Text | 1320 | — |
| LMArena Creative Writing | 1250 | — |
| EQ-Bench Creative Writing | 705 | — |
| WildBench | 80.6% | — |
| LMArena Multi-Turn | 1311 | — |

## FAQ

### Is GPT-5 Nano better than Hy4 preview?

Hy4 preview is the stronger model overall, scoring 44.6 to 33.4 on the Noometry Index. GPT-5 Nano costs 9.1× less per token, which makes it the better buy when Hy4 preview's lead doesn't matter for your workload.

### Which is cheaper, GPT-5 Nano or Hy4 preview?

GPT-5 Nano is cheaper. It lists at $0.05 per million input tokens and $0.40 per million output tokens; Hy4 preview lists at $0.83 and $2.50.

### Is GPT-5 Nano or Hy4 preview better for coding?

Hy4 preview scores higher on coding benchmarks: 51.4 versus 33.3 in the Noometry coding category.

### Which has the bigger context window?

Hy4 preview does, with 1.05M tokens against 400K.

### How many benchmarks do GPT-5 Nano and Hy4 preview share?

1 benchmark has published results for both models. GPT-5 Nano has 48 scored results on Noometry and Hy4 preview has 3.