# Claude 3 Haiku vs Mercury 2

> Mercury 2 is the stronger model overall, scoring 38.8 to 25.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-3-haiku-vs-mercury-2
- Last updated: 2026-10-10
- Shared benchmarks: 12

## Summary

- They share 12 benchmarks with published results for both. Claude 3 Haiku scores higher in 0 categories and Mercury 2 in 7 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Mercury 2 leads 54.0 to 29.8.
- The biggest single-benchmark swing is WeirdML: 9.8% for Claude 3 Haiku and 43.2% for Mercury 2.

## Snapshot

| | Claude 3 Haiku | Mercury 2 |
|---|---|---|
| Provider | Anthropic | Inception |
| Noometry Index | 25.7 | 38.8 |
| Rank | 333 | 167 |
| Context | — | 128K |
| Input $/M | — | $0.25 |
| Output $/M | — | $0.75 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude 3 Haiku: 26.1 (#320)
- Mercury 2: 33.2 (#250)

| Benchmark | Claude 3 Haiku | Mercury 2 |
|---|---|---|
| WeirdML | 9.8% | 43.2% |
| LMArena Coding | 1199 | 1391 |
| LMArena WebDev | — | 1170 |
| SciCode | — | 38.7% |
| BigCodeBench Instruct | 39.4% | — |
| BigCodeBench Complete | 50.1% | — |
| CadEval | 12% | — |
| ALE-Bench | — | 785.58 |
| HumanEval+ | 68.9% | — |
| MBPP+ | 68.8% | — |

## Reasoning

- Claude 3 Haiku: 15.7 (#303)
- Mercury 2: 23.0 (#170)

| Benchmark | Claude 3 Haiku | Mercury 2 |
|---|---|---|
| LMArena Hard Prompts | 1174 | 1362 |
| Kagi LLM Benchmark | 34.2% | — |
| CritPt | — | 0.8% |
| DTBench | 50.1% | — |
| LMCA | 8.8% | — |
| Epoch Capabilities Index | 118.3 | — |
| ForecastBench | 53.2 | — |
| WinoGrande | 74.2% | — |

## Math

- Claude 3 Haiku: 9.2 (#313)
- Mercury 2: —

| Benchmark | Claude 3 Haiku | Mercury 2 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 1.8% | — |
| LMArena Math | 1188 | — |
| MATH Level 5 | 14.9% | — |

## Knowledge

- Claude 3 Haiku: 17.3 (#280)
- Mercury 2: 35.6 (#170)

| Benchmark | Claude 3 Haiku | Mercury 2 |
|---|---|---|
| LMArena Expert | 1148 | 1358 |
| GPQA Diamond | 36.3% | — |
| Confabulations | 34.2% | — |
| Vectara Hallucination Rate | — | 12.3% |
| MMLU | 73.8% | — |

## Multimodal

- Claude 3 Haiku: 23.1 (#123)
- Mercury 2: —

| Benchmark | Claude 3 Haiku | Mercury 2 |
|---|---|---|
| LMArena Vision | 950 | — |
| ScienceQA | 72% | — |

## Multilingual

- Claude 3 Haiku: 36.1 (#238)
- Mercury 2: 46.8 (#153)

| Benchmark | Claude 3 Haiku | Mercury 2 |
|---|---|---|
| LMArena Non-English | 1178 | 1331 |
| LMArena Chinese | 1155 | 1416 |
| LMArena Russian | 1204 | 1303 |
| LMArena French | 1194 | — |
| LMArena German | 1174 | — |
| LMArena Japanese | 1102 | — |
| LMArena Korean | 1108 | — |
| LMArena Spanish | 1165 | — |

## Instruction Following

- Claude 3 Haiku: 61.5 (#242)
- Mercury 2: 70.4 (#161)

| Benchmark | Claude 3 Haiku | Mercury 2 |
|---|---|---|
| LMArena Instruction Following | 1174 | 1328 |

## Long Context

- Claude 3 Haiku: 36.1 (#232)
- Mercury 2: 40.4 (#149)

| Benchmark | Claude 3 Haiku | Mercury 2 |
|---|---|---|
| LMArena Longer Query | 1191 | 1329 |

## Writing & Preference

- Claude 3 Haiku: 29.8 (#286)
- Mercury 2: 54.0 (#151)

| Benchmark | Claude 3 Haiku | Mercury 2 |
|---|---|---|
| LMArena Text | 1195 | 1355 |
| LMArena Creative Writing | 1157 | 1289 |
| LMArena Multi-Turn | 1190 | 1358 |
| EQ-Bench Creative Writing | 717 | — |

## FAQ

### Is Claude 3 Haiku better than Mercury 2?

Mercury 2 is the stronger model overall, scoring 38.8 to 25.7 on the Noometry Index.

### Is Claude 3 Haiku or Mercury 2 better for coding?

Mercury 2 scores higher on coding benchmarks: 33.2 versus 26.1 in the Noometry coding category.

### How many benchmarks do Claude 3 Haiku and Mercury 2 share?

12 benchmarks have published results for both models. Claude 3 Haiku has 37 scored results on Noometry and Mercury 2 has 17.