# Grok 4.20 Multi-Agent vs Kimi K3

> Kimi K3 is the stronger model overall, scoring 59.5 to 46.2 on the Noometry Index. Grok 4.20 Multi-Agent 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-multi-agent-vs-kimi-k3
- Last updated: 2026-10-11
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Grok 4.20 Multi-Agent scores higher in 1 category and Kimi K3 in 8 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Kimi K3 leads 74.2 to 39.4.
- Grok 4.20 Multi-Agent 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 Multi-Agent | Kimi K3 |
|---|---|---|
| Provider | xAI | Moonshot AI |
| Noometry Index | 46.2 | 59.5 |
| Rank | 65 | 15 |
| Context | 1M | 1.05M |
| Input $/M | $1.25 | $3 |
| Output $/M | $2.50 | $15 |
| Weights | Proprietary | Open |

## Coding

- Grok 4.20 Multi-Agent: 43.0 (#92)
- Kimi K3: 61.0 (#10)

| Benchmark | Grok 4.20 Multi-Agent | Kimi K3 |
|---|---|---|
| LMArena Coding | 1457 | 1508 |
| DeepSWE | — | 68.5% |
| FrontierCode | — | 44.2% |
| LMArena WebDev | — | 1654 |
| FrontierSWE | — | 25.9% |
| SciCode | — | 59.5% |
| WeirdML | — | 82.6% |
| ALE-Bench | — | 1,524 |

## Agentic & Tool Use

- Grok 4.20 Multi-Agent: —
- Kimi K3: 41.8 (#20)

| Benchmark | Grok 4.20 Multi-Agent | Kimi K3 |
|---|---|---|
| APEX-Agents | — | 50.6% |
| τ²-bench Banking | — | 37.1% |
| PostTrainBench | — | 32% |
| GBAEval | — | 48.3% |
| GDP.pdf | — | 19% |
| LMArena Search | 1204 | — |
| Vending-Bench 2 | — | 5,165 |

## Reasoning

- Grok 4.20 Multi-Agent: 43.9 (#48)
- Kimi K3: 63.0 (#17)

| Benchmark | Grok 4.20 Multi-Agent | Kimi K3 |
|---|---|---|
| NYT Connections (extended) | 89.6% | 93.6% |
| LMArena Hard Prompts | 1448 | 1496 |
| ARC-AGI-2 | — | 60.4% |
| SimpleBench | — | 60.7% |
| ARC-AGI-1 | — | 94.5% |
| CritPt | — | 23.4% |
| Chess Puzzles | — | 39% |
| Mystery Game Puzzles | — | 26% |
| DTBench | — | 91.2% |
| LMCA | — | 52.7% |
| Surface Evolver Bench | — | 95% |
| Epoch Capabilities Index | — | 157.45 |
| ForecastBench | — | 61.1 |

## Math

- Grok 4.20 Multi-Agent: 39.4 (#104)
- Kimi K3: 74.2 (#16)

| Benchmark | Grok 4.20 Multi-Agent | Kimi K3 |
|---|---|---|
| LMArena Math | 1442 | 1491 |
| FrontierMath (Tiers 1-3) | — | 72.2% |
| FrontierMath Tier 4 | — | 39% |
| MathArena Final-Answer Competitions | — | 87.8% |
| OTIS Mock AIME 2024-2025 | — | 97.2% |
| ProofBench | — | 87% |

## Knowledge

- Grok 4.20 Multi-Agent: 40.4 (#119)
- Kimi K3: 63.2 (#21)

| Benchmark | Grok 4.20 Multi-Agent | Kimi K3 |
|---|---|---|
| LMArena Expert | 1445 | 1521 |
| GPQA Diamond | — | 93.1% |
| SimpleQA Verified | — | 50.6% |

## Multimodal

- Grok 4.20 Multi-Agent: 40.5 (#48)
- Kimi K3: 37.8 (#70)

| Benchmark | Grok 4.20 Multi-Agent | Kimi K3 |
|---|---|---|
| LMArena Vision | 1259 | — |
| Blueprint-Bench 2 | — | 29.5% |
| Furniture Assembly | — | 34.2% |

## Multilingual

- Grok 4.20 Multi-Agent: 54.4 (#43)
- Kimi K3: 56.3 (#21)

| Benchmark | Grok 4.20 Multi-Agent | Kimi K3 |
|---|---|---|
| LMArena Non-English | 1440 | 1466 |
| LMArena Chinese | 1475 | 1529 |
| LMArena French | 1466 | 1491 |
| LMArena German | 1456 | 1488 |
| LMArena Japanese | 1405 | 1487 |
| LMArena Korean | 1416 | 1458 |
| LMArena Russian | 1457 | 1482 |
| LMArena Spanish | 1447 | 1472 |

## Instruction Following

- Grok 4.20 Multi-Agent: 74.8 (#84)
- Kimi K3: 77.7 (#14)

| Benchmark | Grok 4.20 Multi-Agent | Kimi K3 |
|---|---|---|
| LMArena Instruction Following | 1420 | 1483 |

## Long Context

- Grok 4.20 Multi-Agent: 43.7 (#88)
- Kimi K3: 45.8 (#29)

| Benchmark | Grok 4.20 Multi-Agent | Kimi K3 |
|---|---|---|
| LMArena Longer Query | 1431 | 1494 |

## Writing & Preference

- Grok 4.20 Multi-Agent: 64.0 (#59)
- Kimi K3: 76.6 (#4)

| Benchmark | Grok 4.20 Multi-Agent | Kimi K3 |
|---|---|---|
| LMArena Text | 1450 | 1476 |
| LMArena Creative Writing | 1436 | 1454 |
| LMArena Multi-Turn | 1452 | 1488 |
| EQ-Bench Creative Writing | — | 2082 |
| EQ-Bench 4 | — | 1339 |

## FAQ

### Is Grok 4.20 Multi-Agent better than Kimi K3?

Kimi K3 is the stronger model overall, scoring 59.5 to 46.2 on the Noometry Index. Grok 4.20 Multi-Agent 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 Multi-Agent or Kimi K3?

Grok 4.20 Multi-Agent 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 Multi-Agent or Kimi K3 better for coding?

Kimi K3 scores higher on coding benchmarks: 61.0 versus 43.0 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 Multi-Agent and Kimi K3 share?

18 benchmarks have published results for both models. Grok 4.20 Multi-Agent has 20 scored results on Noometry and Kimi K3 has 53.