# GPT-5.3 Chat vs Hy4 preview

> Hy4 preview is the stronger model overall, scoring 44.6 to 42.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-3-chat-vs-hy4-preview
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where Hy4 preview leads 54.5 to 35.4.
- Hy4 preview is cheaper at $0.83 / $2.50 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
- Hy4 preview accepts more context: 1.05M tokens versus 128K.
- Hy4 preview has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.3 Chat | Hy4 preview |
|---|---|---|
| Provider | OpenAI | Tencent |
| Noometry Index | 42.1 | 44.6 |
| Rank | 109 | 73 |
| Context | 128K | 1.05M |
| Input $/M | $1.75 | $0.83 |
| Output $/M | $14 | $2.50 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.3 Chat: 40.8 (#124)
- Hy4 preview: 51.4 (#36)

| Benchmark | GPT-5.3 Chat | Hy4 preview |
|---|---|---|
| LMArena WebDev | — | 1633 |
| LMArena Coding | 1408 | — |

## Reasoning

- GPT-5.3 Chat: 27.3 (#105)
- Hy4 preview: 30.6 (#75)

| Benchmark | GPT-5.3 Chat | Hy4 preview |
|---|---|---|
| NYT Connections (extended) | — | 68.2% |
| LMArena Hard Prompts | 1399 | — |

## Math

- GPT-5.3 Chat: 35.4 (#146)
- Hy4 preview: 54.5 (#37)

| Benchmark | GPT-5.3 Chat | Hy4 preview |
|---|---|---|
| ProofBench | — | 75% |
| LMArena Math | 1389 | — |

## Knowledge

- GPT-5.3 Chat: 38.2 (#137)
- Hy4 preview: —

| Benchmark | GPT-5.3 Chat | Hy4 preview |
|---|---|---|
| LMArena Expert | 1397 | — |

## Multilingual

- GPT-5.3 Chat: 50.5 (#119)
- Hy4 preview: —

| Benchmark | GPT-5.3 Chat | Hy4 preview |
|---|---|---|
| LMArena Non-English | 1383 | — |
| LMArena Chinese | 1433 | — |
| LMArena French | 1398 | — |
| LMArena German | 1384 | — |
| LMArena Japanese | 1351 | — |
| LMArena Korean | 1347 | — |
| LMArena Russian | 1400 | — |
| LMArena Spanish | 1371 | — |

## Instruction Following

- GPT-5.3 Chat: 73.0 (#124)
- Hy4 preview: —

| Benchmark | GPT-5.3 Chat | Hy4 preview |
|---|---|---|
| LMArena Instruction Following | 1378 | — |

## Long Context

- GPT-5.3 Chat: 42.6 (#115)
- Hy4 preview: —

| Benchmark | GPT-5.3 Chat | Hy4 preview |
|---|---|---|
| LMArena Longer Query | 1396 | — |

## Writing & Preference

- GPT-5.3 Chat: 63.3 (#65)
- Hy4 preview: —

| Benchmark | GPT-5.3 Chat | Hy4 preview |
|---|---|---|
| LMArena Text | 1389 | — |
| LMArena Creative Writing | 1356 | — |
| EQ-Bench Creative Writing | 1690 | — |
| LMArena Multi-Turn | 1413 | — |

## FAQ

### Is GPT-5.3 Chat better than Hy4 preview?

Hy4 preview is the stronger model overall, scoring 44.6 to 42.1 on the Noometry Index.

### Which is cheaper, GPT-5.3 Chat or Hy4 preview?

Hy4 preview is cheaper. It lists at $0.83 per million input tokens and $2.50 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.

### Is GPT-5.3 Chat or Hy4 preview better for coding?

Hy4 preview scores higher on coding benchmarks: 51.4 versus 40.8 in the Noometry coding category.

### Which has the bigger context window?

Hy4 preview does, with 1.05M tokens against 128K.

### How many benchmarks do GPT-5.3 Chat and Hy4 preview share?

0 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Hy4 preview has 3.