# GPT-5.5 Instant vs Hy4 preview

> Hy4 preview is the stronger model overall, scoring 45.3 to 42.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-5-instant-vs-hy4-preview
- Last updated: 2026-10-12
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where Hy4 preview leads 55.7 to 26.5.
- Hy4 preview has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.5 Instant | Hy4 preview |
|---|---|---|
| Provider | OpenAI | Tencent |
| Noometry Index | 42.7 | 45.3 |
| Rank | 110 | 73 |
| Context | — | 1.05M |
| Input $/M | — | $0.83 |
| Output $/M | — | $2.50 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.5 Instant: 44.3 (#74)
- Hy4 preview: 51.6 (#38)

| Benchmark | GPT-5.5 Instant | Hy4 preview |
|---|---|---|
| LMArena WebDev | — | 1632 |
| SciCode | 48.6% | — |
| LMArena Coding | 1433 | — |

## Reasoning

- GPT-5.5 Instant: 24.9 (#155)
- Hy4 preview: 31.9 (#79)

| Benchmark | GPT-5.5 Instant | Hy4 preview |
|---|---|---|
| NYT Connections (extended) | — | 68.2% |
| CritPt | 0% | — |
| Chess Puzzles | 12% | — |
| LMArena Hard Prompts | 1426 | — |
| Epoch Capabilities Index | 142.52 | — |

## Math

- GPT-5.5 Instant: 26.5 (#259)
- Hy4 preview: 55.7 (#42)

| Benchmark | GPT-5.5 Instant | Hy4 preview |
|---|---|---|
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.1% | — |
| ProofBench | — | 75% |
| LMArena Math | 1420 | — |

## Knowledge

- GPT-5.5 Instant: 48.9 (#74)
- Hy4 preview: —

| Benchmark | GPT-5.5 Instant | Hy4 preview |
|---|---|---|
| GPQA Diamond | 82.5% | — |
| LMArena Expert | 1409 | — |

## Multimodal

- GPT-5.5 Instant: 40.0 (#52)
- Hy4 preview: —

| Benchmark | GPT-5.5 Instant | Hy4 preview |
|---|---|---|
| LMArena Vision | 1250 | — |
| LMArena Document | 1403 | — |

## Multilingual

- GPT-5.5 Instant: 52.8 (#80)
- Hy4 preview: —

| Benchmark | GPT-5.5 Instant | Hy4 preview |
|---|---|---|
| LMArena Non-English | 1417 | — |
| LMArena Chinese | 1456 | — |
| LMArena French | 1428 | — |
| LMArena German | 1411 | — |
| LMArena Japanese | 1408 | — |
| LMArena Korean | 1392 | — |
| LMArena Russian | 1431 | — |
| LMArena Spanish | 1429 | — |

## Instruction Following

- GPT-5.5 Instant: 74.2 (#100)
- Hy4 preview: —

| Benchmark | GPT-5.5 Instant | Hy4 preview |
|---|---|---|
| LMArena Instruction Following | 1406 | — |

## Long Context

- GPT-5.5 Instant: 43.4 (#96)
- Hy4 preview: —

| Benchmark | GPT-5.5 Instant | Hy4 preview |
|---|---|---|
| LMArena Longer Query | 1422 | — |

## Writing & Preference

- GPT-5.5 Instant: 61.8 (#85)
- Hy4 preview: —

| Benchmark | GPT-5.5 Instant | Hy4 preview |
|---|---|---|
| LMArena Text | 1419 | — |
| LMArena Creative Writing | 1419 | — |
| LMArena Multi-Turn | 1433 | — |

## FAQ

### Is GPT-5.5 Instant better than Hy4 preview?

Hy4 preview is the stronger model overall, scoring 45.3 to 42.7 on the Noometry Index.

### Is GPT-5.5 Instant or Hy4 preview better for coding?

Hy4 preview scores higher on coding benchmarks: 51.6 versus 44.3 in the Noometry coding category.

### How many benchmarks do GPT-5.5 Instant and Hy4 preview share?

0 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Hy4 preview has 3.