# Hy4 preview vs Kimi K2.5

> Kimi K2.5 is the stronger model overall, scoring 48.1 to 45.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/hy4-preview-vs-kimi-k2-5
- Last updated: 2026-10-11
- Shared benchmarks: 2

## Summary

- They share 2 benchmarks with published results for both. Hy4 preview scores higher in 3 categories and Kimi K2.5 in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in math, where Hy4 preview leads 55.7 to 51.8.
- Kimi K2.5 is cheaper at $0.45 / $2.25 per million input/output tokens, against $0.83 / $2.50 for Hy4 preview.
- Hy4 preview accepts more context: 1.05M tokens versus 262K.

## Snapshot

| | Hy4 preview | Kimi K2.5 |
|---|---|---|
| Provider | Tencent | Moonshot AI |
| Noometry Index | 45.3 | 48.1 |
| Rank | 73 | 57 |
| Context | 1.05M | 262K |
| Input $/M | $0.83 | $0.45 |
| Output $/M | $2.50 | $2.25 |
| Weights | Open | Open |

## Coding

- Hy4 preview: 51.6 (#38)
- Kimi K2.5: 48.8 (#53)

| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| LMArena WebDev | 1632 | 1437 |
| SWE-bench Verified | — | 73.8% |
| SWE-bench Verified (bash only) | — | 70.8% |
| SWE-bench Multilingual | — | 67.3% |
| SciCode | — | 49% |
| WeirdML | — | 45.6% |
| LMArena Coding | — | 1474 |
| ALE-Bench | — | 821.65 |

## Agentic & Tool Use

- Hy4 preview: —
- Kimi K2.5: 34.2 (#48)

| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| Terminal-Bench | — | 43.2% |
| OSWorld | — | 63.3% |
| Vending-Bench 2 | — | 1,198 |

## Reasoning

- Hy4 preview: 31.9 (#79)
- Kimi K2.5: 31.2 (#80)

| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| NYT Connections (extended) | 68.2% | 69.9% |
| ARC-AGI-2 | — | 11.8% |
| SimpleBench | — | 46.8% |
| Kagi LLM Benchmark | — | 78.5% |
| ARC-AGI-1 | — | 65.3% |
| CritPt | — | 3.1% |
| Chess Puzzles | — | 12% |
| EnigmaEval | — | 3.4% |
| Thematic Generalization | — | 69.4% |
| LMArena Hard Prompts | — | 1453 |
| Epoch Capabilities Index | — | 148.03 |

## Math

- Hy4 preview: 55.7 (#42)
- Kimi K2.5: 51.8 (#53)

| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| MathArena Final-Answer Competitions | — | 62.3% |
| OTIS Mock AIME 2024-2025 | — | 92.2% |
| ProofBench | 75% | — |
| LMArena Math | — | 1470 |
| FrontierMath (Feb 2025 set) | — | 27.9% |
| FrontierMath Tier 4 (v1) | — | 4.2% |

## Knowledge

- Hy4 preview: —
- Kimi K2.5: 53.6 (#56)

| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| GPQA Diamond | — | 87.6% |
| Humanity's Last Exam | — | 24.4% |
| SimpleQA Verified | — | 34.3% |
| Vectara Hallucination Rate | — | 14.2% |
| LMArena Expert | — | 1466 |

## Multimodal

- Hy4 preview: —
- Kimi K2.5: 41.1 (#39)

| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| LMArena Vision | — | 1269 |
| LMArena Document | — | 1430 |

## Multilingual

- Hy4 preview: —
- Kimi K2.5: 53.9 (#53)

| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| LMArena Non-English | — | 1433 |
| LMArena Chinese | — | 1495 |
| LMArena French | — | 1454 |
| LMArena German | — | 1441 |
| LMArena Japanese | — | 1421 |
| LMArena Korean | — | 1410 |
| LMArena Russian | — | 1435 |
| LMArena Spanish | — | 1450 |

## Instruction Following

- Hy4 preview: —
- Kimi K2.5: 75.3 (#64)

| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| LMArena Instruction Following | — | 1431 |

## Long Context

- Hy4 preview: —
- Kimi K2.5: 52.1 (#7)

| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| Fiction.LiveBench | — | 86.1% |
| CL-bench | — | 19.3% |
| CL-bench Life | — | 13.2% |
| LMArena Longer Query | — | 1445 |

## Writing & Preference

- Hy4 preview: —
- Kimi K2.5: 65.1 (#53)

| Benchmark | Hy4 preview | Kimi K2.5 |
|---|---|---|
| LMArena Text | — | 1445 |
| LMArena Creative Writing | — | 1423 |
| EQ-Bench Creative Writing | — | 1579 |
| LMArena Multi-Turn | — | 1444 |

## FAQ

### Is Hy4 preview better than Kimi K2.5?

Kimi K2.5 is the stronger model overall, scoring 48.1 to 45.3 on the Noometry Index.

### Which is cheaper, Hy4 preview or Kimi K2.5?

Kimi K2.5 is cheaper. It lists at $0.45 per million input tokens and $2.25 per million output tokens; Hy4 preview lists at $0.83 and $2.50.

### Is Hy4 preview or Kimi K2.5 better for coding?

Hy4 preview scores higher on coding benchmarks: 51.6 versus 48.8 in the Noometry coding category.

### Which has the bigger context window?

Hy4 preview does, with 1.05M tokens against 262K.

### How many benchmarks do Hy4 preview and Kimi K2.5 share?

2 benchmarks have published results for both models. Hy4 preview has 3 scored results on Noometry and Kimi K2.5 has 51.