# Grok 4.1 vs Kimi K2 (Jul 2025)

> Grok 4.1 and Kimi K2 (Jul 2025) score almost the same on the Noometry Index (40.8 vs 40.9), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/grok-4-1-vs-kimi-k2
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Grok 4.1 scores higher in 7 categories and Kimi K2 (Jul 2025) in 2 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in coding, where Kimi K2 (Jul 2025) leads 43.1 to 33.4.
- Kimi K2 (Jul 2025) has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.1 | Kimi K2 (Jul 2025) |
|---|---|---|
| Provider | xAI | Moonshot AI |
| Noometry Index | 40.8 | 40.9 |
| Rank | 135 | 134 |
| Context | — | 262K |
| Input $/M | — | $0.57 |
| Output $/M | — | $2.30 |
| Weights | Proprietary | Open |

## Coding

- Grok 4.1: 33.4 (#246)
- Kimi K2 (Jul 2025): 43.1 (#83)

| Benchmark | Grok 4.1 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Coding | 1445 | 1399 |
| SWE-bench Verified (bash only) | — | 63.4% |
| Aider Polyglot | — | 59.1% |
| LMArena WebDev | 1214 | — |
| GSO | — | 4.9% |
| WeirdML | — | 42.8% |
| ALE-Bench | — | 597.5 |

## Agentic & Tool Use

- Grok 4.1: 33.8 (#47)
- Kimi K2 (Jul 2025): 32.2 (#59)

| Benchmark | Grok 4.1 | Kimi K2 (Jul 2025) |
|---|---|---|
| Terminal-Bench | — | 35.7% |
| Berkeley Function Calling Leaderboard | — | 59.1% |
| Cybench | 39% | — |
| METR Time Horizons | — | 59.2% |

## Reasoning

- Grok 4.1: 28.3 (#91)
- Kimi K2 (Jul 2025): 22.7 (#173)

| Benchmark | Grok 4.1 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Hard Prompts | 1436 | 1384 |
| SimpleBench | — | 26.3% |
| Kagi LLM Benchmark | — | 64.4% |
| Epoch Capabilities Index | — | 146.02 |
| ForecastBench | — | 60.2 |

## Math

- Grok 4.1: 36.2 (#124)
- Kimi K2 (Jul 2025): 40.1 (#81)

| Benchmark | Grok 4.1 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Math | 1422 | 1396 |
| Omni-MATH | — | 65.4% |
| FrontierMath (Feb 2025 set) | — | 21.4% |
| FrontierMath Tier 4 (v1) | — | 0% |

## Knowledge

- Grok 4.1: 38.9 (#129)
- Kimi K2 (Jul 2025): 36.9 (#153)

| Benchmark | Grok 4.1 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Expert | 1417 | 1363 |
| MMLU-Pro | — | 81.9% |
| Confabulations | — | 20.4% |
| Vectara Hallucination Rate | — | 17.9% |
| GPQA (HELM) | — | 65.3% |

## Multilingual

- Grok 4.1: 53.6 (#64)
- Kimi K2 (Jul 2025): 49.8 (#125)

| Benchmark | Grok 4.1 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Non-English | 1425 | 1372 |
| LMArena Chinese | 1464 | 1416 |
| LMArena French | 1448 | 1379 |
| LMArena German | 1447 | 1386 |
| LMArena Japanese | 1396 | 1349 |
| LMArena Korean | 1407 | 1324 |
| LMArena Russian | 1434 | 1384 |
| LMArena Spanish | 1438 | 1383 |

## Instruction Following

- Grok 4.1: 74.0 (#106)
- Kimi K2 (Jul 2025): 71.3 (#151)

| Benchmark | Grok 4.1 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Instruction Following | 1400 | 1347 |
| IFEval | — | 85% |

## Long Context

- Grok 4.1: 43.2 (#96)
- Kimi K2 (Jul 2025): 41.2 (#140)

| Benchmark | Grok 4.1 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Longer Query | 1416 | 1353 |
| Fiction.LiveBench | — | 66.7% |
| CL-bench | — | 17.6% |

## Writing & Preference

- Grok 4.1: 62.6 (#71)
- Kimi K2 (Jul 2025): 62.5 (#76)

| Benchmark | Grok 4.1 | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Text | 1437 | 1380 |
| LMArena Creative Writing | 1411 | 1349 |
| LMArena Multi-Turn | 1438 | 1371 |
| Short-Story Creative Writing | — | 85.6% |
| EQ-Bench Creative Writing | — | 1666 |
| WildBench | — | 86.2% |

## FAQ

### Is Grok 4.1 better than Kimi K2 (Jul 2025)?

Grok 4.1 and Kimi K2 (Jul 2025) score almost the same on the Noometry Index (40.8 vs 40.9), so choose on price, context window or the category you care about most.

### Is Grok 4.1 or Kimi K2 (Jul 2025) better for coding?

Kimi K2 (Jul 2025) scores higher on coding benchmarks: 43.1 versus 33.4 in the Noometry coding category.

### How many benchmarks do Grok 4.1 and Kimi K2 (Jul 2025) share?

17 benchmarks have published results for both models. Grok 4.1 has 19 scored results on Noometry and Kimi K2 (Jul 2025) has 42.