# GPT-5.2 Codex vs Hy4 preview

> Hy4 preview is the stronger model overall, scoring 44.6 to 42.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-2-codex-vs-hy4-preview
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. GPT-5.2 Codex scores higher in 0 categories and Hy4 preview in 1 category; one gap is clear of the uncertainty.
- The widest gap is in coding, where Hy4 preview leads 51.4 to 45.4.
- Hy4 preview is cheaper at $0.83 / $2.50 per million input/output tokens, against $1.75 / $14 for GPT-5.2 Codex.
- Hy4 preview accepts more context: 1.05M tokens versus 400K.
- Hy4 preview has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.2 Codex | Hy4 preview |
|---|---|---|
| Provider | OpenAI | Tencent |
| Noometry Index | 42.2 | 44.6 |
| Rank | 107 | 73 |
| Context | 400K | 1.05M |
| Input $/M | $1.75 | $0.83 |
| Output $/M | $14 | $2.50 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.2 Codex: 45.4 (#66)
- Hy4 preview: 51.4 (#36)

| Benchmark | GPT-5.2 Codex | Hy4 preview |
|---|---|---|
| LMArena WebDev | 1339 | 1633 |
| SWE-bench Verified (bash only) | 72.8% | — |
| SWE-bench Multilingual | 66.3% | — |
| ALE-Bench | 1,300 | — |

## Agentic & Tool Use

- GPT-5.2 Codex: 40.7 (#20)
- Hy4 preview: —

| Benchmark | GPT-5.2 Codex | Hy4 preview |
|---|---|---|
| Terminal-Bench | 66.5% | — |

## Reasoning

- GPT-5.2 Codex: —
- Hy4 preview: 30.6 (#75)

| Benchmark | GPT-5.2 Codex | Hy4 preview |
|---|---|---|
| NYT Connections (extended) | — | 68.2% |

## Math

- GPT-5.2 Codex: —
- Hy4 preview: 54.5 (#37)

| Benchmark | GPT-5.2 Codex | Hy4 preview |
|---|---|---|
| ProofBench | — | 75% |

## FAQ

### Is GPT-5.2 Codex better than Hy4 preview?

Hy4 preview is the stronger model overall, scoring 44.6 to 42.2 on the Noometry Index.

### Which is cheaper, GPT-5.2 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-5.2 Codex lists at $1.75 and $14.

### Is GPT-5.2 Codex or Hy4 preview better for coding?

Hy4 preview scores higher on coding benchmarks: 51.4 versus 45.4 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-5.2 Codex and Hy4 preview share?

1 benchmark has published results for both models. GPT-5.2 Codex has 5 scored results on Noometry and Hy4 preview has 3.