# Grok-2 (Dec 2024) vs Yi-Lightning

> Yi-Lightning is the stronger model overall, scoring 36.5 to 33.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-2-vs-yi-lightning
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Grok-2 (Dec 2024) scores higher in 2 categories and Yi-Lightning in 6 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in math, where Yi-Lightning leads 33.5 to 19.6.

## Snapshot

| | Grok-2 (Dec 2024) | Yi-Lightning |
|---|---|---|
| Provider | xAI | 01.AI |
| Noometry Index | 33.4 | 36.5 |
| Rank | 233 | 206 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Proprietary |

## Coding

- Grok-2 (Dec 2024): 32.9 (#254)
- Yi-Lightning: 27.0 (#315)

| Benchmark | Grok-2 (Dec 2024) | Yi-Lightning |
|---|---|---|
| LMArena Coding | 1288 | 1313 |
| Aider Polyglot | — | 12.9% |
| WeirdML | 22.2% | — |
| LiveBench Coding | 46.4% | — |

## Reasoning

- Grok-2 (Dec 2024): 16.4 (#294)
- Yi-Lightning: 24.9 (#137)

| Benchmark | Grok-2 (Dec 2024) | Yi-Lightning |
|---|---|---|
| LMArena Hard Prompts | 1272 | 1302 |
| SimpleBench | 22.7% | — |
| LiveBench Reasoning | 54.8% | — |
| DTBench | 65.2% | — |
| LiveBench Data Analysis | 54.5% | — |
| Epoch Capabilities Index | 130.48 | — |
| LiveBench | 54.3% | — |

## Math

- Grok-2 (Dec 2024): 19.6 (#278)
- Yi-Lightning: 33.5 (#173)

| Benchmark | Grok-2 (Dec 2024) | Yi-Lightning |
|---|---|---|
| LMArena Math | 1283 | 1300 |
| OTIS Mock AIME 2024-2025 | 11.5% | — |
| LiveBench Math | 54.9% | — |
| MATH Level 5 | 63.5% | — |
| FrontierMath (Feb 2025 set) | 0.7% | — |

## Knowledge

- Grok-2 (Dec 2024): 29.8 (#225)
- Yi-Lightning: 34.8 (#182)

| Benchmark | Grok-2 (Dec 2024) | Yi-Lightning |
|---|---|---|
| LMArena Expert | 1254 | 1286 |
| GPQA Diamond | 53.8% | — |
| Confabulations | 20.1% | — |

## Multilingual

- Grok-2 (Dec 2024): 43.3 (#183)
- Yi-Lightning: 42.4 (#191)

| Benchmark | Grok-2 (Dec 2024) | Yi-Lightning |
|---|---|---|
| LMArena Non-English | 1282 | 1269 |
| LMArena Chinese | 1289 | 1320 |
| LMArena French | 1317 | 1304 |
| LMArena German | 1287 | 1267 |
| LMArena Japanese | 1244 | 1228 |
| LMArena Korean | 1237 | 1192 |
| LMArena Russian | 1286 | 1255 |
| LMArena Spanish | 1281 | 1315 |

## Instruction Following

- Grok-2 (Dec 2024): 67.1 (#197)
- Yi-Lightning: 67.6 (#191)

| Benchmark | Grok-2 (Dec 2024) | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | 1270 | 1278 |
| LiveBench Instruction Following | 69.6% | — |

## Long Context

- Grok-2 (Dec 2024): 38.7 (#186)
- Yi-Lightning: 39.4 (#176)

| Benchmark | Grok-2 (Dec 2024) | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | 1276 | 1297 |

## Writing & Preference

- Grok-2 (Dec 2024): 48.8 (#192)
- Yi-Lightning: 50.4 (#178)

| Benchmark | Grok-2 (Dec 2024) | Yi-Lightning |
|---|---|---|
| LMArena Text | 1305 | 1302 |
| LMArena Creative Writing | 1284 | 1280 |
| LMArena Multi-Turn | 1290 | 1311 |
| Short-Story Creative Writing | 63.6% | — |
| LiveBench Language | 45.6% | — |

## FAQ

### Is Grok-2 (Dec 2024) better than Yi-Lightning?

Yi-Lightning is the stronger model overall, scoring 36.5 to 33.4 on the Noometry Index.

### Is Grok-2 (Dec 2024) or Yi-Lightning better for coding?

Grok-2 (Dec 2024) scores higher on coding benchmarks: 32.9 versus 27.0 in the Noometry coding category.

### How many benchmarks do Grok-2 (Dec 2024) and Yi-Lightning share?

17 benchmarks have published results for both models. Grok-2 (Dec 2024) has 34 scored results on Noometry and Yi-Lightning has 18.