# Grok 4.20 (Non-Reasoning) vs Kimi K3

> Kimi K3 is the stronger model overall, scoring 59.5 to 48.5 on the Noometry Index. Grok 4.20 (Non-Reasoning) costs 3.8× less per token, which makes it the better buy when Kimi K3's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/grok-4-20-vs-kimi-k3
- Last updated: 2026-10-10
- Shared benchmarks: 38

## Summary

- They share 38 benchmarks with published results for both. Grok 4.20 (Non-Reasoning) scores higher in 0 categories and Kimi K3 in 10 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Kimi K3 leads 74.0 to 48.0.
- The biggest single-benchmark swing is ProofBench: 14% for Grok 4.20 (Non-Reasoning) and 87% for Kimi K3.
- Grok 4.20 (Non-Reasoning) is cheaper at $1.25 / $2.50 per million input/output tokens, against $3 / $15 for Kimi K3.
- Kimi K3 accepts more context: 1.05M tokens versus 1M.
- Kimi K3 has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.20 (Non-Reasoning) | Kimi K3 |
|---|---|---|
| Provider | xAI | Moonshot AI |
| Noometry Index | 48.5 | 59.5 |
| Rank | 48 | 12 |
| Context | 1M | 1.05M |
| Input $/M | $1.25 | $3 |
| Output $/M | $2.50 | $15 |
| Weights | Proprietary | Open |

## Coding

- Grok 4.20 (Non-Reasoning): 41.8 (#104)
- Kimi K3: 60.6 (#8)

| Benchmark | Grok 4.20 (Non-Reasoning) | Kimi K3 |
|---|---|---|
| LMArena WebDev | 1374 | 1659 |
| WeirdML | 52.3% | 82.6% |
| LMArena Coding | 1458 | 1509 |
| ALE-Bench | 1,150 | 1,524 |
| DeepSWE | — | 68.5% |
| FrontierCode | — | 44.2% |
| FrontierSWE | — | 25.9% |
| SciCode | — | 59.5% |

## Agentic & Tool Use

- Grok 4.20 (Non-Reasoning): 34.3 (#43)
- Kimi K3: 41.8 (#19)

| Benchmark | Grok 4.20 (Non-Reasoning) | Kimi K3 |
|---|---|---|
| τ²-bench Banking | 18% | 37.1% |
| Vending-Bench 2 | 4,663 | 5,165 |
| Terminal-Bench | 57.3% | — |
| APEX-Agents | — | 50.6% |
| PostTrainBench | — | 32% |
| GBAEval | — | 48.3% |
| GDP.pdf | — | 19% |
| LMArena Search | 1189 | — |

## Reasoning

- Grok 4.20 (Non-Reasoning): 52.2 (#30)
- Kimi K3: 63.0 (#15)

| Benchmark | Grok 4.20 (Non-Reasoning) | Kimi K3 |
|---|---|---|
| ARC-AGI-2 | 65.1% | 60.4% |
| NYT Connections (extended) | 85.4% | 93.6% |
| ARC-AGI-1 | 89.5% | 94.5% |
| Chess Puzzles | 24% | 39% |
| LMArena Hard Prompts | 1451 | 1495 |
| DTBench | 90.1% | 91.2% |
| LMCA | 38.7% | 52.7% |
| Epoch Capabilities Index | 152.01 | 157.68 |
| ForecastBench | 61.4 | 61.1 |
| SimpleBench | — | 60.7% |
| Kagi LLM Benchmark | 75% | — |
| CritPt | — | 23.4% |
| Thematic Generalization | 63.8% | — |
| Mystery Game Puzzles | — | 26% |
| Surface Evolver Bench | — | 95% |

## Math

- Grok 4.20 (Non-Reasoning): 48.0 (#54)
- Kimi K3: 74.0 (#13)

| Benchmark | Grok 4.20 (Non-Reasoning) | Kimi K3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 44.9% | 72.2% |
| FrontierMath Tier 4 | 17.1% | 39% |
| OTIS Mock AIME 2024-2025 | 92.2% | 97.2% |
| ProofBench | 14% | 87% |
| LMArena Math | 1455 | 1493 |
| MathArena Final-Answer Competitions | — | 87.8% |

## Knowledge

- Grok 4.20 (Non-Reasoning): 52.8 (#54)
- Kimi K3: 63.2 (#19)

| Benchmark | Grok 4.20 (Non-Reasoning) | Kimi K3 |
|---|---|---|
| GPQA Diamond | 89.3% | 93.1% |
| SimpleQA Verified | 30.2% | 50.6% |
| LMArena Expert | 1440 | 1520 |

## Multimodal

- Grok 4.20 (Non-Reasoning): 33.2 (#88)
- Kimi K3: 38.4 (#58)

| Benchmark | Grok 4.20 (Non-Reasoning) | Kimi K3 |
|---|---|---|
| Blueprint-Bench 2 | 0% | 29.5% |
| LMArena Vision | 1263 | — |
| Furniture Assembly | — | 34.2% |
| LMArena Document | 1416 | — |

## Multilingual

- Grok 4.20 (Non-Reasoning): 54.7 (#38)
- Kimi K3: 56.5 (#20)

| Benchmark | Grok 4.20 (Non-Reasoning) | Kimi K3 |
|---|---|---|
| LMArena Non-English | 1440 | 1466 |
| LMArena Chinese | 1481 | 1528 |
| LMArena French | 1477 | 1488 |
| LMArena German | 1463 | 1474 |
| LMArena Japanese | 1450 | 1492 |
| LMArena Korean | 1417 | 1465 |
| LMArena Russian | 1457 | 1481 |
| LMArena Spanish | 1442 | 1478 |

## Instruction Following

- Grok 4.20 (Non-Reasoning): 75.0 (#79)
- Kimi K3: 77.8 (#13)

| Benchmark | Grok 4.20 (Non-Reasoning) | Kimi K3 |
|---|---|---|
| LMArena Instruction Following | 1420 | 1481 |

## Long Context

- Grok 4.20 (Non-Reasoning): 45.4 (#33)
- Kimi K3: 45.8 (#27)

| Benchmark | Grok 4.20 (Non-Reasoning) | Kimi K3 |
|---|---|---|
| LMArena Longer Query | 1436 | 1494 |
| CL-bench | 22.2% | — |
| CL-bench Life | 11.9% | — |

## Writing & Preference

- Grok 4.20 (Non-Reasoning): 65.9 (#42)
- Kimi K3: 76.7 (#4)

| Benchmark | Grok 4.20 (Non-Reasoning) | Kimi K3 |
|---|---|---|
| LMArena Text | 1451 | 1476 |
| LMArena Creative Writing | 1439 | 1452 |
| EQ-Bench Creative Writing | 1574 | 2082 |
| LMArena Multi-Turn | 1456 | 1488 |
| EQ-Bench 4 | — | 1339 |

## FAQ

### Is Grok 4.20 (Non-Reasoning) better than Kimi K3?

Kimi K3 is the stronger model overall, scoring 59.5 to 48.5 on the Noometry Index. Grok 4.20 (Non-Reasoning) costs 3.8× less per token, which makes it the better buy when Kimi K3's lead doesn't matter for your workload.

### Which is cheaper, Grok 4.20 (Non-Reasoning) or Kimi K3?

Grok 4.20 (Non-Reasoning) is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; Kimi K3 lists at $3 and $15.

### Is Grok 4.20 (Non-Reasoning) or Kimi K3 better for coding?

Kimi K3 scores higher on coding benchmarks: 60.6 versus 41.8 in the Noometry coding category.

### Which has the bigger context window?

Kimi K3 does, with 1.05M tokens against 1M.

### How many benchmarks do Grok 4.20 (Non-Reasoning) and Kimi K3 share?

38 benchmarks have published results for both models. Grok 4.20 (Non-Reasoning) has 46 scored results on Noometry and Kimi K3 has 53.