# Grok 4.20 Multi-Agent vs Mercury 2.5

> Grok 4.20 Multi-Agent is the stronger model overall, scoring 46.2 to 33.5 on the Noometry Index. Mercury 2.5 costs 23× less per token, which makes it the better buy when Grok 4.20 Multi-Agent's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/grok-4-20-multi-agent-vs-mercury-2-5
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where Grok 4.20 Multi-Agent leads 43.9 to 22.4.
- Mercury 2.5 is cheaper at $0.04 / $0.15 per million input/output tokens, against $1.25 / $2.50 for Grok 4.20 Multi-Agent.
- Grok 4.20 Multi-Agent accepts more context: 1M tokens versus 260K.

## Snapshot

| | Grok 4.20 Multi-Agent | Mercury 2.5 |
|---|---|---|
| Provider | xAI | Inception |
| Noometry Index | 46.2 | 33.5 |
| Rank | 65 | 242 |
| Context | 1M | 260K |
| Input $/M | $1.25 | $0.04 |
| Output $/M | $2.50 | $0.15 |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4.20 Multi-Agent: 43.0 (#92)
- Mercury 2.5: 39.5 (#156)

| Benchmark | Grok 4.20 Multi-Agent | Mercury 2.5 |
|---|---|---|
| SciCode | — | 38.5% |
| LMArena Coding | 1457 | — |
| ALE-Bench | — | 301.65 |

## Agentic & Tool Use

- Grok 4.20 Multi-Agent: —
- Mercury 2.5: —

| Benchmark | Grok 4.20 Multi-Agent | Mercury 2.5 |
|---|---|---|
| LMArena Search | 1204 | — |

## Reasoning

- Grok 4.20 Multi-Agent: 43.9 (#48)
- Mercury 2.5: 22.4 (#193)

| Benchmark | Grok 4.20 Multi-Agent | Mercury 2.5 |
|---|---|---|
| NYT Connections (extended) | 89.6% | — |
| CritPt | — | 0% |
| LMArena Hard Prompts | 1448 | — |

## Math

- Grok 4.20 Multi-Agent: 39.4 (#104)
- Mercury 2.5: 23.3 (#272)

| Benchmark | Grok 4.20 Multi-Agent | Mercury 2.5 |
|---|---|---|
| ProofBench | — | 3% |
| LMArena Math | 1442 | — |

## Knowledge

- Grok 4.20 Multi-Agent: 40.4 (#119)
- Mercury 2.5: —

| Benchmark | Grok 4.20 Multi-Agent | Mercury 2.5 |
|---|---|---|
| LMArena Expert | 1445 | — |

## Multimodal

- Grok 4.20 Multi-Agent: 40.5 (#48)
- Mercury 2.5: —

| Benchmark | Grok 4.20 Multi-Agent | Mercury 2.5 |
|---|---|---|
| LMArena Vision | 1259 | — |

## Multilingual

- Grok 4.20 Multi-Agent: 54.4 (#43)
- Mercury 2.5: —

| Benchmark | Grok 4.20 Multi-Agent | Mercury 2.5 |
|---|---|---|
| LMArena Non-English | 1440 | — |
| LMArena Chinese | 1475 | — |
| LMArena French | 1466 | — |
| LMArena German | 1456 | — |
| LMArena Japanese | 1405 | — |
| LMArena Korean | 1416 | — |
| LMArena Russian | 1457 | — |
| LMArena Spanish | 1447 | — |

## Instruction Following

- Grok 4.20 Multi-Agent: 74.8 (#84)
- Mercury 2.5: —

| Benchmark | Grok 4.20 Multi-Agent | Mercury 2.5 |
|---|---|---|
| LMArena Instruction Following | 1420 | — |

## Long Context

- Grok 4.20 Multi-Agent: 43.7 (#88)
- Mercury 2.5: —

| Benchmark | Grok 4.20 Multi-Agent | Mercury 2.5 |
|---|---|---|
| LMArena Longer Query | 1431 | — |

## Writing & Preference

- Grok 4.20 Multi-Agent: 64.0 (#59)
- Mercury 2.5: —

| Benchmark | Grok 4.20 Multi-Agent | Mercury 2.5 |
|---|---|---|
| LMArena Text | 1450 | — |
| LMArena Creative Writing | 1436 | — |
| LMArena Multi-Turn | 1452 | — |

## FAQ

### Is Grok 4.20 Multi-Agent better than Mercury 2.5?

Grok 4.20 Multi-Agent is the stronger model overall, scoring 46.2 to 33.5 on the Noometry Index. Mercury 2.5 costs 23× less per token, which makes it the better buy when Grok 4.20 Multi-Agent's lead doesn't matter for your workload.

### Which is cheaper, Grok 4.20 Multi-Agent or Mercury 2.5?

Mercury 2.5 is cheaper. It lists at $0.04 per million input tokens and $0.15 per million output tokens; Grok 4.20 Multi-Agent lists at $1.25 and $2.50.

### Is Grok 4.20 Multi-Agent or Mercury 2.5 better for coding?

Grok 4.20 Multi-Agent scores higher on coding benchmarks: 43.0 versus 39.5 in the Noometry coding category.

### Which has the bigger context window?

Grok 4.20 Multi-Agent does, with 1M tokens against 260K.

### How many benchmarks do Grok 4.20 Multi-Agent and Mercury 2.5 share?

0 benchmarks have published results for both models. Grok 4.20 Multi-Agent has 20 scored results on Noometry and Mercury 2.5 has 4.