# Mercury 2 vs Qwen3-4B

> Mercury 2 is the stronger model overall, scoring 39.1 to 31.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/mercury-2-vs-qwen3-4b
- Last updated: 2026-10-12
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. Mercury 2 scores higher in 2 categories and Qwen3-4B in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Mercury 2 leads 23.8 to 19.2.
- The biggest single-benchmark swing is Vectara Hallucination Rate: 12.3% for Mercury 2 and 5.7% for Qwen3-4B.
- Qwen3-4B has downloadable open weights; the other is API-only.

## Snapshot

| | Mercury 2 | Qwen3-4B |
|---|---|---|
| Provider | Inception | Alibaba (Qwen) |
| Noometry Index | 39.1 | 31.9 |
| Rank | 175 | 264 |
| Context | 128K | — |
| Input $/M | $0.25 | — |
| Output $/M | $0.75 | — |
| Weights | Proprietary | Open |

## Coding

- Mercury 2: 33.5 (#255)
- Qwen3-4B: —

| Benchmark | Mercury 2 | Qwen3-4B |
|---|---|---|
| LMArena WebDev | 1171 | — |
| SciCode | 38.7% | — |
| WeirdML | 43.2% | — |
| LMArena Coding | 1391 | — |
| ALE-Bench | 785.58 | — |

## Agentic & Tool Use

- Mercury 2: —
- Qwen3-4B: 27.6 (#100)

| Benchmark | Mercury 2 | Qwen3-4B |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 35.7% |

## Reasoning

- Mercury 2: 23.8 (#170)
- Qwen3-4B: 19.2 (#268)

| Benchmark | Mercury 2 | Qwen3-4B |
|---|---|---|
| CritPt | 0.8% | — |
| Chess Puzzles | — | 4% |
| LMArena Hard Prompts | 1362 | — |

## Math

- Mercury 2: —
- Qwen3-4B: 29.7 (#240)

| Benchmark | Mercury 2 | Qwen3-4B |
|---|---|---|
| MathArena Final-Answer Competitions | — | 38.5% |
| OTIS Mock AIME 2024-2025 | — | 52.2% |

## Knowledge

- Mercury 2: 36.2 (#172)
- Qwen3-4B: 33.0 (#208)

| Benchmark | Mercury 2 | Qwen3-4B |
|---|---|---|
| Vectara Hallucination Rate | 12.3% | 5.7% |
| GPQA Diamond | — | 52.3% |
| LMArena Expert | 1358 | — |

## Multilingual

- Mercury 2: 46.6 (#157)
- Qwen3-4B: —

| Benchmark | Mercury 2 | Qwen3-4B |
|---|---|---|
| LMArena Non-English | 1331 | — |
| LMArena Chinese | 1417 | — |
| LMArena Russian | 1304 | — |

## Instruction Following

- Mercury 2: 70.2 (#165)
- Qwen3-4B: —

| Benchmark | Mercury 2 | Qwen3-4B |
|---|---|---|
| LMArena Instruction Following | 1329 | — |

## Long Context

- Mercury 2: 40.5 (#154)
- Qwen3-4B: —

| Benchmark | Mercury 2 | Qwen3-4B |
|---|---|---|
| LMArena Longer Query | 1330 | — |

## Writing & Preference

- Mercury 2: 53.8 (#155)
- Qwen3-4B: —

| Benchmark | Mercury 2 | Qwen3-4B |
|---|---|---|
| LMArena Text | 1355 | — |
| LMArena Creative Writing | 1289 | — |
| LMArena Multi-Turn | 1358 | — |

## FAQ

### Is Mercury 2 better than Qwen3-4B?

Mercury 2 is the stronger model overall, scoring 39.1 to 31.9 on the Noometry Index.

### How many benchmarks do Mercury 2 and Qwen3-4B share?

1 benchmark has published results for both models. Mercury 2 has 17 scored results on Noometry and Qwen3-4B has 6.