# Hy3 vs Mercury 2.5

> Hy3 is the stronger model overall, scoring 44.2 to 33.5 on the Noometry Index. Mercury 2.5 costs 3.4× less per token, which makes it the better buy when Hy3's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/hy3-vs-mercury-2-5
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where Hy3 leads 40.1 to 23.3.
- Mercury 2.5 is cheaper at $0.04 / $0.15 per million input/output tokens, against $0.13 / $0.53 for Hy3.
- Hy3 accepts more context: 262K tokens versus 260K.
- Hy3 has downloadable open weights; the other is API-only.

## Snapshot

| | Hy3 | Mercury 2.5 |
|---|---|---|
| Provider | Tencent | Inception |
| Noometry Index | 44.2 | 33.5 |
| Rank | 79 | 242 |
| Context | 262K | 260K |
| Input $/M | $0.13 | $0.04 |
| Output $/M | $0.53 | $0.15 |
| Weights | Open | Proprietary |

## Coding

- Hy3: 46.8 (#63)
- Mercury 2.5: 39.5 (#156)

| Benchmark | Hy3 | Mercury 2.5 |
|---|---|---|
| LMArena WebDev | 1508 | — |
| SciCode | — | 38.5% |
| LMArena Coding | 1464 | — |
| ALE-Bench | — | 301.65 |

## Reasoning

- Hy3: 26.1 (#136)
- Mercury 2.5: 22.4 (#193)

| Benchmark | Hy3 | Mercury 2.5 |
|---|---|---|
| NYT Connections (extended) | 41.2% | — |
| CritPt | — | 0% |
| LMArena Hard Prompts | 1447 | — |

## Math

- Hy3: 40.1 (#93)
- Mercury 2.5: 23.3 (#272)

| Benchmark | Hy3 | Mercury 2.5 |
|---|---|---|
| ProofBench | — | 3% |
| LMArena Math | 1475 | — |

## Knowledge

- Hy3: 40.8 (#114)
- Mercury 2.5: —

| Benchmark | Hy3 | Mercury 2.5 |
|---|---|---|
| LMArena Expert | 1460 | — |

## Multilingual

- Hy3: 53.5 (#65)
- Mercury 2.5: —

| Benchmark | Hy3 | Mercury 2.5 |
|---|---|---|
| LMArena Non-English | 1426 | — |
| LMArena Chinese | 1493 | — |
| LMArena French | 1461 | — |
| LMArena German | 1439 | — |
| LMArena Japanese | 1392 | — |
| LMArena Korean | 1395 | — |
| LMArena Russian | 1432 | — |
| LMArena Spanish | 1456 | — |

## Instruction Following

- Hy3: 75.1 (#70)
- Mercury 2.5: —

| Benchmark | Hy3 | Mercury 2.5 |
|---|---|---|
| LMArena Instruction Following | 1426 | — |

## Long Context

- Hy3: 44.1 (#75)
- Mercury 2.5: —

| Benchmark | Hy3 | Mercury 2.5 |
|---|---|---|
| LMArena Longer Query | 1442 | — |

## Writing & Preference

- Hy3: 62.2 (#81)
- Mercury 2.5: —

| Benchmark | Hy3 | Mercury 2.5 |
|---|---|---|
| LMArena Text | 1439 | — |
| LMArena Creative Writing | 1402 | — |
| LMArena Multi-Turn | 1436 | — |

## FAQ

### Is Hy3 better than Mercury 2.5?

Hy3 is the stronger model overall, scoring 44.2 to 33.5 on the Noometry Index. Mercury 2.5 costs 3.4× less per token, which makes it the better buy when Hy3's lead doesn't matter for your workload.

### Which is cheaper, Hy3 or Mercury 2.5?

Mercury 2.5 is cheaper. It lists at $0.04 per million input tokens and $0.15 per million output tokens; Hy3 lists at $0.13 and $0.53.

### Is Hy3 or Mercury 2.5 better for coding?

Hy3 scores higher on coding benchmarks: 46.8 versus 39.5 in the Noometry coding category.

### Which has the bigger context window?

Hy3 does, with 262K tokens against 260K.

### How many benchmarks do Hy3 and Mercury 2.5 share?

0 benchmarks have published results for both models. Hy3 has 19 scored results on Noometry and Mercury 2.5 has 4.