# GPT-5-Codex vs Hy4 preview

> Hy4 preview is the stronger model overall, scoring 44.6 to 37.3 on the Noometry Index.

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

## Summary

- The widest gap is in coding, where Hy4 preview leads 51.4 to 41.9.
- Hy4 preview is cheaper at $0.83 / $2.50 per million input/output tokens, against $1.25 / $10 for GPT-5-Codex.
- Hy4 preview accepts more context: 1.05M tokens versus 400K.
- Hy4 preview has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5-Codex | Hy4 preview |
|---|---|---|
| Provider | OpenAI | Tencent |
| Noometry Index | 37.3 | 44.6 |
| Rank | 190 | 73 |
| Context | 400K | 1.05M |
| Input $/M | $1.25 | $0.83 |
| Output $/M | $10 | $2.50 |
| Weights | Proprietary | Open |

## Coding

- GPT-5-Codex: 41.9 (#100)
- Hy4 preview: 51.4 (#36)

| Benchmark | GPT-5-Codex | Hy4 preview |
|---|---|---|
| LMArena WebDev | — | 1633 |
| WeirdML | 54.5% | — |

## Agentic & Tool Use

- GPT-5-Codex: 30.8 (#66)
- Hy4 preview: —

| Benchmark | GPT-5-Codex | Hy4 preview |
|---|---|---|
| Terminal-Bench | 44.3% | — |

## Reasoning

- GPT-5-Codex: 30.0 (#80)
- Hy4 preview: 30.6 (#75)

| Benchmark | GPT-5-Codex | Hy4 preview |
|---|---|---|
| Kagi LLM Benchmark | 70.3% | — |
| NYT Connections (extended) | — | 68.2% |

## Math

- GPT-5-Codex: —
- Hy4 preview: 54.5 (#37)

| Benchmark | GPT-5-Codex | Hy4 preview |
|---|---|---|
| ProofBench | — | 75% |

## FAQ

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

Hy4 preview is the stronger model overall, scoring 44.6 to 37.3 on the Noometry Index.

### Which is cheaper, GPT-5-Codex 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-Codex lists at $1.25 and $10.

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

Hy4 preview scores higher on coding benchmarks: 51.4 versus 41.9 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-Codex and Hy4 preview share?

0 benchmarks have published results for both models. GPT-5-Codex has 3 scored results on Noometry and Hy4 preview has 3.