# Grok 3 vs Mercury

> Grok 3 is the stronger model overall, scoring 39.9 to 37.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-3-vs-mercury
- Last updated: 2026-10-11
- Shared benchmarks: 9

## Summary

- They share 9 benchmarks with published results for both. Grok 3 scores higher in 5 categories and Mercury in 1 category; 5 gaps are clear of the uncertainty.
- The widest gap is in multilingual, where Grok 3 leads 52.3 to 41.6.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 61.3% for Grok 3 and 21.6% for Mercury.

## Snapshot

| | Grok 3 | Mercury |
|---|---|---|
| Provider | xAI | Inception |
| Noometry Index | 39.9 | 37.6 |
| Rank | 157 | 199 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 3: 41.9 (#115)
- Mercury: 38.7 (#170)

| Benchmark | Grok 3 | Mercury |
|---|---|---|
| LMArena Coding | 1432 | 1322 |
| Aider Polyglot | 53.3% | — |
| WeirdML | 37.2% | — |

## Agentic & Tool Use

- Grok 3: 30.5 (#76)
- Mercury: —

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

## Reasoning

- Grok 3: 13.7 (#333)
- Mercury: 17.5 (#293)

| Benchmark | Grok 3 | Mercury |
|---|---|---|
| Kagi LLM Benchmark | 61.3% | 21.6% |
| LMArena Hard Prompts | 1434 | 1285 |
| ARC-AGI-2 | 0% | — |
| SimpleBench | 36.1% | — |
| ARC-AGI-1 | 5.5% | — |
| Epoch Capabilities Index | 138.33 | — |

## Math

- Grok 3: 38.0 (#145)
- Mercury: —

| Benchmark | Grok 3 | Mercury |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 55.6% | — |
| Omni-MATH | 46.4% | — |
| LMArena Math | 1391 | — |
| MATH Level 5 | 88.7% | — |
| FrontierMath (Feb 2025 set) | 3.8% | — |
| FrontierMath Tier 4 (v1) | 0% | — |

## Knowledge

- Grok 3: 46.2 (#82)
- Mercury: —

| Benchmark | Grok 3 | Mercury |
|---|---|---|
| GPQA Diamond | 75.8% | — |
| MMLU-Pro | 78.8% | — |
| Confabulations | 14.2% | — |
| Vectara Hallucination Rate | 5.8% | — |
| GPQA (HELM) | 65% | — |
| LMArena Expert | 1421 | — |

## Multilingual

- Grok 3: 52.3 (#87)
- Mercury: 41.6 (#206)

| Benchmark | Grok 3 | Mercury |
|---|---|---|
| LMArena Non-English | 1410 | 1260 |
| LMArena Chinese | 1448 | — |
| LMArena French | 1460 | — |
| LMArena German | 1431 | — |
| LMArena Japanese | 1387 | — |
| LMArena Korean | 1373 | — |
| LMArena Russian | 1416 | — |
| LMArena Spanish | 1417 | — |

## Instruction Following

- Grok 3: 75.0 (#73)
- Mercury: 65.2 (#224)

| Benchmark | Grok 3 | Mercury |
|---|---|---|
| LMArena Instruction Following | 1409 | 1239 |
| IFEval | 88.4% | — |

## Long Context

- Grok 3: 38.7 (#192)
- Mercury: 38.4 (#198)

| Benchmark | Grok 3 | Mercury |
|---|---|---|
| LMArena Longer Query | 1439 | 1266 |
| Fiction.LiveBench | 58.3% | — |

## Writing & Preference

- Grok 3: 55.8 (#141)
- Mercury: 46.2 (#221)

| Benchmark | Grok 3 | Mercury |
|---|---|---|
| LMArena Text | 1426 | 1282 |
| LMArena Creative Writing | 1414 | 1191 |
| LMArena Multi-Turn | 1425 | 1282 |
| Short-Story Creative Writing | 76.4% | — |
| EQ-Bench Creative Writing | 1186 | — |
| WildBench | 84.9% | — |

## FAQ

### Is Grok 3 better than Mercury?

Grok 3 is the stronger model overall, scoring 39.9 to 37.6 on the Noometry Index.

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

Grok 3 scores higher on coding benchmarks: 41.9 versus 38.7 in the Noometry coding category.

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

9 benchmarks have published results for both models. Grok 3 has 40 scored results on Noometry and Mercury has 9.