# Grok 4 Fast vs Kimi K2 Thinking Turbo

> Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.8 to 39.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-fast-vs-kimi-k2-thinking-turbo
- Last updated: 2026-10-12
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Grok 4 Fast scores higher in 2 categories and Kimi K2 Thinking Turbo in 6 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 43.2.
- Kimi K2 Thinking Turbo has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| Provider | xAI | Moonshot AI |
| Noometry Index | 39.4 | 45.8 |
| Rank | 167 | 70 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Open |

## Coding

- Grok 4 Fast: 32.5 (#271)
- Kimi K2 Thinking Turbo: 38.4 (#178)

| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena WebDev | 1159 | 1322 |
| LMArena Coding | 1429 | 1454 |
| WeirdML | 42.9% | — |

## Agentic & Tool Use

- Grok 4 Fast: 29.5 (#86)
- Kimi K2 Thinking Turbo: —

| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |

## Reasoning

- Grok 4 Fast: 22.2 (#201)
- Kimi K2 Thinking Turbo: 32.5 (#75)

| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Hard Prompts | 1412 | 1428 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| Chess Puzzles | — | 20% |
| DTBench | 82.7% | — |
| Epoch Capabilities Index | 144.2 | — |
| ForecastBench | 60.5 | — |

## Math

- Grok 4 Fast: 38.9 (#123)
- Kimi K2 Thinking Turbo: 47.4 (#68)

| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Math | 1419 | 1429 |
| OTIS Mock AIME 2024-2025 | — | 83.1% |

## Knowledge

- Grok 4 Fast: 32.0 (#214)
- Kimi K2 Thinking Turbo: 50.9 (#69)

| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Expert | 1411 | 1439 |
| GPQA Diamond | — | 84.2% |
| Vectara Hallucination Rate | 19.7% | — |

## Multilingual

- Grok 4 Fast: 51.3 (#111)
- Kimi K2 Thinking Turbo: 51.4 (#109)

| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Non-English | 1396 | 1398 |
| LMArena Chinese | 1457 | 1456 |
| LMArena French | 1431 | 1425 |
| LMArena German | 1383 | 1390 |
| LMArena Japanese | 1352 | 1357 |
| LMArena Korean | 1357 | 1330 |
| LMArena Russian | 1389 | 1391 |
| LMArena Spanish | 1415 | 1406 |

## Instruction Following

- Grok 4 Fast: 73.2 (#121)
- Kimi K2 Thinking Turbo: 74.0 (#109)

| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Instruction Following | 1387 | 1403 |

## Long Context

- Grok 4 Fast: 63.2 (#3)
- Kimi K2 Thinking Turbo: 43.2 (#102)

| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Longer Query | 1415 | 1415 |
| Fiction.LiveBench | 94.4% | — |

## Writing & Preference

- Grok 4 Fast: 60.0 (#102)
- Kimi K2 Thinking Turbo: 60.0 (#104)

| Benchmark | Grok 4 Fast | Kimi K2 Thinking Turbo |
|---|---|---|
| LMArena Text | 1407 | 1415 |
| LMArena Creative Writing | 1387 | 1374 |
| LMArena Multi-Turn | 1414 | 1414 |

## FAQ

### Is Grok 4 Fast better than Kimi K2 Thinking Turbo?

Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.8 to 39.4 on the Noometry Index.

### Is Grok 4 Fast or Kimi K2 Thinking Turbo better for coding?

Kimi K2 Thinking Turbo scores higher on coding benchmarks: 38.4 versus 32.5 in the Noometry coding category.

### How many benchmarks do Grok 4 Fast and Kimi K2 Thinking Turbo share?

18 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Kimi K2 Thinking Turbo has 21.