# Grok 4.20 Multi-Agent vs Grok 4 Fast

> Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 39.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-20-multi-agent-vs-grok-4-fast
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Grok 4.20 Multi-Agent scores higher in 7 categories and Grok 4 Fast in 1 category; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.20 Multi-Agent leads 42.4 to 22.5.

## Snapshot

| | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| Provider | xAI | xAI |
| Noometry Index | 45.5 | 39.0 |
| Rank | 62 | 164 |
| Context | 1M | — |
| Input $/M | $1.25 | — |
| Output $/M | $2.50 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4.20 Multi-Agent: 42.4 (#91)
- Grok 4 Fast: 32.3 (#264)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Coding | 1458 | 1429 |
| LMArena WebDev | — | 1160 |
| WeirdML | — | 42.9% |

## Agentic & Tool Use

- Grok 4.20 Multi-Agent: —
- Grok 4 Fast: 29.3 (#80)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Search | 1204 | 1171 |
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |

## Reasoning

- Grok 4.20 Multi-Agent: 42.4 (#44)
- Grok 4 Fast: 22.5 (#179)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Hard Prompts | 1448 | 1413 |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| NYT Connections (extended) | 89.6% | — |
| ARC-AGI-1 | — | 48.5% |
| DTBench | — | 82.7% |
| Epoch Capabilities Index | — | 144.21 |
| ForecastBench | — | 60.5 |

## Math

- Grok 4.20 Multi-Agent: 36.6 (#106)
- Grok 4 Fast: 36.1 (#126)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1441 | 1419 |

## Knowledge

- Grok 4.20 Multi-Agent: 39.7 (#116)
- Grok 4 Fast: 31.5 (#211)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Expert | 1445 | 1411 |
| Vectara Hallucination Rate | — | 19.7% |

## Multimodal

- Grok 4.20 Multi-Agent: 39.8 (#44)
- Grok 4 Fast: —

| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Vision | 1259 | — |

## Multilingual

- Grok 4.20 Multi-Agent: 54.6 (#40)
- Grok 4 Fast: 51.5 (#106)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1440 | 1397 |
| LMArena Chinese | 1475 | 1458 |
| LMArena French | 1467 | 1433 |
| LMArena German | 1456 | 1383 |
| LMArena Japanese | 1405 | 1358 |
| LMArena Korean | 1416 | 1359 |
| LMArena Russian | 1457 | 1387 |
| LMArena Spanish | 1447 | 1414 |

## Instruction Following

- Grok 4.20 Multi-Agent: 75.0 (#80)
- Grok 4 Fast: 73.4 (#116)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1420 | 1388 |

## Long Context

- Grok 4.20 Multi-Agent: 43.7 (#84)
- Grok 4 Fast: 63.2 (#3)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1430 | 1415 |
| Fiction.LiveBench | — | 94.4% |

## Writing & Preference

- Grok 4.20 Multi-Agent: 64.1 (#57)
- Grok 4 Fast: 60.2 (#96)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1450 | 1407 |
| LMArena Creative Writing | 1435 | 1388 |
| LMArena Multi-Turn | 1451 | 1414 |

## FAQ

### Is Grok 4.20 Multi-Agent better than Grok 4 Fast?

Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 39.0 on the Noometry Index.

### Is Grok 4.20 Multi-Agent or Grok 4 Fast better for coding?

Grok 4.20 Multi-Agent scores higher on coding benchmarks: 42.4 versus 32.3 in the Noometry coding category.

### How many benchmarks do Grok 4.20 Multi-Agent and Grok 4 Fast share?

18 benchmarks have published results for both models. Grok 4.20 Multi-Agent has 20 scored results on Noometry and Grok 4 Fast has 30.