# Grok 4.20 Multi-Agent vs o3-pro

> Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 42.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-20-multi-agent-vs-o3-pro
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in long context, where o3-pro leads 72.1 to 43.7.
- Grok 4.20 Multi-Agent is cheaper at $1.25 / $2.50 per million input/output tokens, against $20 / $80 for o3-pro.
- Grok 4.20 Multi-Agent accepts more context: 1M tokens versus 200K.

## Snapshot

| | Grok 4.20 Multi-Agent | o3-pro |
|---|---|---|
| Provider | xAI | OpenAI |
| Noometry Index | 45.5 | 42.7 |
| Rank | 62 | 94 |
| Context | 1M | 200K |
| Input $/M | $1.25 | $20 |
| Output $/M | $2.50 | $80 |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4.20 Multi-Agent: 42.4 (#91)
- o3-pro: 55.1 (#22)

| Benchmark | Grok 4.20 Multi-Agent | o3-pro |
|---|---|---|
| Aider Polyglot | — | 84.9% |
| WeirdML | — | 58.2% |
| LMArena Coding | 1458 | — |

## Agentic & Tool Use

- Grok 4.20 Multi-Agent: —
- o3-pro: —

| Benchmark | Grok 4.20 Multi-Agent | o3-pro |
|---|---|---|
| LMArena Search | 1204 | — |

## Reasoning

- Grok 4.20 Multi-Agent: 42.4 (#44)
- o3-pro: 24.1 (#152)

| Benchmark | Grok 4.20 Multi-Agent | o3-pro |
|---|---|---|
| ARC-AGI-2 | — | 4.9% |
| Kagi LLM Benchmark | — | 72.1% |
| NYT Connections (extended) | 89.6% | — |
| ARC-AGI-1 | — | 59.3% |
| LMArena Hard Prompts | 1448 | — |
| DTBench | — | 86.9% |
| LMCA | — | 38.5% |
| Epoch Capabilities Index | — | 147.43 |

## Math

- Grok 4.20 Multi-Agent: 36.6 (#106)
- o3-pro: —

| Benchmark | Grok 4.20 Multi-Agent | o3-pro |
|---|---|---|
| LMArena Math | 1441 | — |

## Knowledge

- Grok 4.20 Multi-Agent: 39.7 (#116)
- o3-pro: 29.0 (#234)

| Benchmark | Grok 4.20 Multi-Agent | o3-pro |
|---|---|---|
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |
| LMArena Expert | 1445 | — |

## Multimodal

- Grok 4.20 Multi-Agent: 39.8 (#44)
- o3-pro: —

| Benchmark | Grok 4.20 Multi-Agent | o3-pro |
|---|---|---|
| LMArena Vision | 1259 | — |

## Multilingual

- Grok 4.20 Multi-Agent: 54.6 (#40)
- o3-pro: —

| Benchmark | Grok 4.20 Multi-Agent | o3-pro |
|---|---|---|
| LMArena Non-English | 1440 | — |
| LMArena Chinese | 1475 | — |
| LMArena French | 1467 | — |
| LMArena German | 1456 | — |
| LMArena Japanese | 1405 | — |
| LMArena Korean | 1416 | — |
| LMArena Russian | 1457 | — |
| LMArena Spanish | 1447 | — |

## Instruction Following

- Grok 4.20 Multi-Agent: 75.0 (#80)
- o3-pro: —

| Benchmark | Grok 4.20 Multi-Agent | o3-pro |
|---|---|---|
| LMArena Instruction Following | 1420 | — |

## Long Context

- Grok 4.20 Multi-Agent: 43.7 (#84)
- o3-pro: 72.1 (#1)

| Benchmark | Grok 4.20 Multi-Agent | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
| LMArena Longer Query | 1430 | — |

## Writing & Preference

- Grok 4.20 Multi-Agent: 64.1 (#57)
- o3-pro: 57.1 (#128)

| Benchmark | Grok 4.20 Multi-Agent | o3-pro |
|---|---|---|
| LMArena Text | 1450 | — |
| LMArena Creative Writing | 1435 | — |
| Short-Story Creative Writing | — | 84.4% |
| LMArena Multi-Turn | 1451 | — |

## FAQ

### Is Grok 4.20 Multi-Agent better than o3-pro?

Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 42.7 on the Noometry Index.

### Which is cheaper, Grok 4.20 Multi-Agent or o3-pro?

Grok 4.20 Multi-Agent is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; o3-pro lists at $20 and $80.

### Is Grok 4.20 Multi-Agent or o3-pro better for coding?

o3-pro scores higher on coding benchmarks: 55.1 versus 42.4 in the Noometry coding category.

### Which has the bigger context window?

Grok 4.20 Multi-Agent does, with 1M tokens against 200K.

### How many benchmarks do Grok 4.20 Multi-Agent and o3-pro share?

0 benchmarks have published results for both models. Grok 4.20 Multi-Agent has 20 scored results on Noometry and o3-pro has 12.