# Grok 4.1 vs Kimi K2.5

> Kimi K2.5 is the stronger model overall, scoring 47.8 to 40.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-1-vs-kimi-k2-5
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Grok 4.1 scores higher in 0 categories and Kimi K2.5 in 9 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in coding, where Kimi K2.5 leads 48.7 to 33.4.
- Kimi K2.5 has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.1 | Kimi K2.5 |
|---|---|---|
| Provider | xAI | Moonshot AI |
| Noometry Index | 40.8 | 47.8 |
| Rank | 135 | 50 |
| Context | — | 262K |
| Input $/M | — | $0.45 |
| Output $/M | — | $2.25 |
| Weights | Proprietary | Open |

## Coding

- Grok 4.1: 33.4 (#246)
- Kimi K2.5: 48.7 (#48)

| Benchmark | Grok 4.1 | Kimi K2.5 |
|---|---|---|
| LMArena WebDev | 1214 | 1436 |
| LMArena Coding | 1445 | 1474 |
| SWE-bench Verified | — | 73.8% |
| SWE-bench Verified (bash only) | — | 70.8% |
| SWE-bench Multilingual | — | 67.3% |
| SciCode | — | 49% |
| WeirdML | — | 45.6% |
| ALE-Bench | — | 821.65 |

## Agentic & Tool Use

- Grok 4.1: 33.8 (#47)
- Kimi K2.5: 34.0 (#44)

| Benchmark | Grok 4.1 | Kimi K2.5 |
|---|---|---|
| Terminal-Bench | — | 43.2% |
| Cybench | 39% | — |
| OSWorld | — | 63.3% |
| Vending-Bench 2 | — | 1,198 |

## Reasoning

- Grok 4.1: 28.3 (#91)
- Kimi K2.5: 31.2 (#74)

| Benchmark | Grok 4.1 | Kimi K2.5 |
|---|---|---|
| LMArena Hard Prompts | 1436 | 1454 |
| ARC-AGI-2 | — | 11.8% |
| SimpleBench | — | 46.8% |
| Kagi LLM Benchmark | — | 78.5% |
| NYT Connections (extended) | — | 69.9% |
| ARC-AGI-1 | — | 65.3% |
| CritPt | — | 3.1% |
| Chess Puzzles | — | 12% |
| EnigmaEval | — | 3.4% |
| Thematic Generalization | — | 69.4% |
| Epoch Capabilities Index | — | 148.05 |

## Math

- Grok 4.1: 36.2 (#124)
- Kimi K2.5: 50.3 (#46)

| Benchmark | Grok 4.1 | Kimi K2.5 |
|---|---|---|
| LMArena Math | 1422 | 1470 |
| MathArena Final-Answer Competitions | — | 62.3% |
| OTIS Mock AIME 2024-2025 | — | 92.2% |
| FrontierMath (Feb 2025 set) | — | 27.9% |
| FrontierMath Tier 4 (v1) | — | 4.2% |

## Knowledge

- Grok 4.1: 38.9 (#129)
- Kimi K2.5: 53.6 (#52)

| Benchmark | Grok 4.1 | Kimi K2.5 |
|---|---|---|
| LMArena Expert | 1417 | 1466 |
| GPQA Diamond | — | 87.6% |
| Humanity's Last Exam | — | 24.4% |
| SimpleQA Verified | — | 34.3% |
| Vectara Hallucination Rate | — | 14.2% |

## Multimodal

- Grok 4.1: —
- Kimi K2.5: 40.4 (#37)

| Benchmark | Grok 4.1 | Kimi K2.5 |
|---|---|---|
| LMArena Vision | — | 1269 |
| LMArena Document | — | 1430 |

## Multilingual

- Grok 4.1: 53.6 (#64)
- Kimi K2.5: 54.1 (#50)

| Benchmark | Grok 4.1 | Kimi K2.5 |
|---|---|---|
| LMArena Non-English | 1425 | 1433 |
| LMArena Chinese | 1464 | 1495 |
| LMArena French | 1448 | 1454 |
| LMArena German | 1447 | 1441 |
| LMArena Japanese | 1396 | 1422 |
| LMArena Korean | 1407 | 1412 |
| LMArena Russian | 1434 | 1436 |
| LMArena Spanish | 1438 | 1450 |

## Instruction Following

- Grok 4.1: 74.0 (#106)
- Kimi K2.5: 75.5 (#60)

| Benchmark | Grok 4.1 | Kimi K2.5 |
|---|---|---|
| LMArena Instruction Following | 1400 | 1431 |

## Long Context

- Grok 4.1: 43.2 (#96)
- Kimi K2.5: 52.1 (#7)

| Benchmark | Grok 4.1 | Kimi K2.5 |
|---|---|---|
| LMArena Longer Query | 1416 | 1445 |
| Fiction.LiveBench | — | 86.1% |
| CL-bench | — | 19.3% |
| CL-bench Life | — | 13.2% |

## Writing & Preference

- Grok 4.1: 62.6 (#71)
- Kimi K2.5: 65.3 (#51)

| Benchmark | Grok 4.1 | Kimi K2.5 |
|---|---|---|
| LMArena Text | 1437 | 1445 |
| LMArena Creative Writing | 1411 | 1423 |
| LMArena Multi-Turn | 1438 | 1444 |
| EQ-Bench Creative Writing | — | 1579 |

## FAQ

### Is Grok 4.1 better than Kimi K2.5?

Kimi K2.5 is the stronger model overall, scoring 47.8 to 40.8 on the Noometry Index.

### Is Grok 4.1 or Kimi K2.5 better for coding?

Kimi K2.5 scores higher on coding benchmarks: 48.7 versus 33.4 in the Noometry coding category.

### How many benchmarks do Grok 4.1 and Kimi K2.5 share?

18 benchmarks have published results for both models. Grok 4.1 has 19 scored results on Noometry and Kimi K2.5 has 51.