# Grok 3 vs Mercury 2

> Grok 3 and Mercury 2 score almost the same on the Noometry Index (39.6 vs 38.8), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/grok-3-vs-mercury-2
- Last updated: 2026-10-10
- Shared benchmarks: 13

## Summary

- They share 13 benchmarks with published results for both. Grok 3 scores higher in 5 categories and Mercury 2 in 2 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Grok 3 leads 46.0 to 35.6.
- The biggest single-benchmark swing is Vectara Hallucination Rate: 5.8% for Grok 3 and 12.3% for Mercury 2.

## Snapshot

| | Grok 3 | Mercury 2 |
|---|---|---|
| Provider | xAI | Inception |
| Noometry Index | 39.6 | 38.8 |
| Rank | 150 | 167 |
| Context | — | 128K |
| Input $/M | — | $0.25 |
| Output $/M | — | $0.75 |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 3: 41.5 (#113)
- Mercury 2: 33.2 (#250)

| Benchmark | Grok 3 | Mercury 2 |
|---|---|---|
| WeirdML | 37.2% | 43.2% |
| LMArena Coding | 1432 | 1391 |
| Aider Polyglot | 53.3% | — |
| LMArena WebDev | — | 1170 |
| SciCode | — | 38.7% |
| ALE-Bench | — | 785.58 |

## Agentic & Tool Use

- Grok 3: 30.2 (#69)
- Mercury 2: —

| Benchmark | Grok 3 | Mercury 2 |
|---|---|---|
| BALROG | 29.5% | — |

## Reasoning

- Grok 3: 13.8 (#322)
- Mercury 2: 23.0 (#170)

| Benchmark | Grok 3 | Mercury 2 |
|---|---|---|
| LMArena Hard Prompts | 1433 | 1362 |
| ARC-AGI-2 | 0% | — |
| SimpleBench | 36.1% | — |
| Kagi LLM Benchmark | 61.3% | — |
| ARC-AGI-1 | 5.5% | — |
| CritPt | — | 0.8% |
| Epoch Capabilities Index | 138.34 | — |

## Math

- Grok 3: 36.2 (#122)
- Mercury 2: —

| Benchmark | Grok 3 | Mercury 2 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 55.6% | — |
| Omni-MATH | 46.4% | — |
| LMArena Math | 1390 | — |
| MATH Level 5 | 88.7% | — |
| FrontierMath (Feb 2025 set) | 3.8% | — |
| FrontierMath Tier 4 (v1) | 0% | — |

## Knowledge

- Grok 3: 46.0 (#76)
- Mercury 2: 35.6 (#170)

| Benchmark | Grok 3 | Mercury 2 |
|---|---|---|
| Vectara Hallucination Rate | 5.8% | 12.3% |
| LMArena Expert | 1420 | 1358 |
| GPQA Diamond | 75.8% | — |
| MMLU-Pro | 78.8% | — |
| Confabulations | 14.2% | — |
| GPQA (HELM) | 65% | — |

## Multilingual

- Grok 3: 52.5 (#81)
- Mercury 2: 46.8 (#153)

| Benchmark | Grok 3 | Mercury 2 |
|---|---|---|
| LMArena Non-English | 1411 | 1331 |
| LMArena Chinese | 1448 | 1416 |
| LMArena Russian | 1416 | 1303 |
| LMArena French | 1460 | — |
| LMArena German | 1431 | — |
| LMArena Japanese | 1389 | — |
| LMArena Korean | 1374 | — |
| LMArena Spanish | 1417 | — |

## Instruction Following

- Grok 3: 75.2 (#69)
- Mercury 2: 70.4 (#161)

| Benchmark | Grok 3 | Mercury 2 |
|---|---|---|
| LMArena Instruction Following | 1409 | 1328 |
| IFEval | 88.4% | — |

## Long Context

- Grok 3: 38.7 (#187)
- Mercury 2: 40.4 (#149)

| Benchmark | Grok 3 | Mercury 2 |
|---|---|---|
| LMArena Longer Query | 1439 | 1329 |
| Fiction.LiveBench | 58.3% | — |

## Writing & Preference

- Grok 3: 56.0 (#136)
- Mercury 2: 54.0 (#151)

| Benchmark | Grok 3 | Mercury 2 |
|---|---|---|
| LMArena Text | 1426 | 1355 |
| LMArena Creative Writing | 1414 | 1289 |
| LMArena Multi-Turn | 1424 | 1358 |
| Short-Story Creative Writing | 76.4% | — |
| EQ-Bench Creative Writing | 1186 | — |
| WildBench | 84.9% | — |

## FAQ

### Is Grok 3 better than Mercury 2?

Grok 3 and Mercury 2 score almost the same on the Noometry Index (39.6 vs 38.8), so choose on price, context window or the category you care about most.

### Is Grok 3 or Mercury 2 better for coding?

Grok 3 scores higher on coding benchmarks: 41.5 versus 33.2 in the Noometry coding category.

### How many benchmarks do Grok 3 and Mercury 2 share?

13 benchmarks have published results for both models. Grok 3 has 40 scored results on Noometry and Mercury 2 has 17.