# GPT-5.4 mini vs Hy4 preview

> GPT-5.4 mini and Hy4 preview score almost the same on the Noometry Index (45.0 vs 45.3), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gpt-5-4-mini-vs-hy4-preview
- Last updated: 2026-10-10
- Shared benchmarks: 3

## Summary

- They share 3 benchmarks with published results for both. GPT-5.4 mini 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 55.7 to 45.5.
- The biggest single-benchmark swing is ProofBench: 21% for GPT-5.4 mini and 75% for Hy4 preview.
- Hy4 preview is cheaper at $0.75 / $2.25 per million input/output tokens, against $0.75 / $4.50 for GPT-5.4 mini.
- Hy4 preview accepts more context: 1.05M tokens versus 400K.
- Hy4 preview has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| Provider | OpenAI | Tencent |
| Noometry Index | 45.0 | 45.3 |
| Rank | 76 | 73 |
| Context | 400K | 1.05M |
| Input $/M | $0.75 | $0.75 |
| Output $/M | $4.50 | $2.25 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.4 mini: 45.2 (#72)
- Hy4 preview: 51.6 (#38)

| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| LMArena WebDev | 1397 | 1632 |
| FrontierCode | 27% | — |
| SciCode | 49.9% | — |
| WeirdML | 60.3% | — |
| LMArena Coding | 1438 | — |
| ALE-Bench | 1,189 | — |

## Agentic & Tool Use

- GPT-5.4 mini: 29.9 (#81)
- Hy4 preview: —

| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| DeepResearch Bench | 36.3% | — |

## Reasoning

- GPT-5.4 mini: 30.4 (#85)
- Hy4 preview: 31.9 (#79)

| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| NYT Connections (extended) | 61.8% | 68.2% |
| ARC-AGI-2 | 18.9% | — |
| Kagi LLM Benchmark | 37.9% | — |
| ARC-AGI-1 | 63.7% | — |
| CritPt | 10% | — |
| Chess Puzzles | 24% | — |
| Thematic Generalization | 61.7% | — |
| LMArena Hard Prompts | 1424 | — |
| Mystery Game Puzzles | 11% | — |
| DTBench | 80% | — |
| LMCA | 40.8% | — |
| Epoch Capabilities Index | 148.84 | — |
| ForecastBench | 57 | — |

## Math

- GPT-5.4 mini: 45.5 (#75)
- Hy4 preview: 55.7 (#42)

| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| ProofBench | 21% | 75% |
| FrontierMath (Tiers 1-3) | 51.2% | — |
| FrontierMath Tier 4 | 9.8% | — |
| OTIS Mock AIME 2024-2025 | 88.9% | — |
| LMArena Math | 1419 | — |
| FrontierMath (Feb 2025 set) | 28.3% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |

## Knowledge

- GPT-5.4 mini: 51.5 (#67)
- Hy4 preview: —

| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| GPQA Diamond | 86.9% | — |
| SimpleQA Verified | 29.4% | — |
| Vectara Hallucination Rate | 5.5% | — |
| LMArena Expert | 1435 | — |

## Multimodal

- GPT-5.4 mini: 39.7 (#56)
- Hy4 preview: —

| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| LMArena Vision | 1245 | — |

## Multilingual

- GPT-5.4 mini: 51.9 (#96)
- Hy4 preview: —

| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| LMArena Non-English | 1405 | — |
| LMArena Chinese | 1446 | — |
| LMArena French | 1440 | — |
| LMArena German | 1409 | — |
| LMArena Japanese | 1374 | — |
| LMArena Korean | 1368 | — |
| LMArena Russian | 1417 | — |
| LMArena Spanish | 1405 | — |

## Instruction Following

- GPT-5.4 mini: 74.1 (#102)
- Hy4 preview: —

| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| LMArena Instruction Following | 1405 | — |

## Long Context

- GPT-5.4 mini: 43.0 (#112)
- Hy4 preview: —

| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| LMArena Longer Query | 1407 | — |

## Writing & Preference

- GPT-5.4 mini: 64.0 (#58)
- Hy4 preview: —

| Benchmark | GPT-5.4 mini | Hy4 preview |
|---|---|---|
| LMArena Text | 1412 | — |
| LMArena Creative Writing | 1370 | — |
| EQ-Bench Creative Writing | 1665 | — |
| LMArena Multi-Turn | 1429 | — |

## FAQ

### Is GPT-5.4 mini better than Hy4 preview?

GPT-5.4 mini and Hy4 preview score almost the same on the Noometry Index (45.0 vs 45.3), so choose on price, context window or the category you care about most.

### Which is cheaper, GPT-5.4 mini or Hy4 preview?

Hy4 preview is cheaper. It lists at $0.75 per million input tokens and $2.25 per million output tokens; GPT-5.4 mini lists at $0.75 and $4.50.

### Is GPT-5.4 mini or Hy4 preview better for coding?

Hy4 preview scores higher on coding benchmarks: 51.6 versus 45.2 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-5.4 mini and Hy4 preview share?

3 benchmarks have published results for both models. GPT-5.4 mini has 46 scored results on Noometry and Hy4 preview has 3.