# Grok 4.20 Multi-Agent vs Grok 4.5

> Grok 4.5 is the stronger model overall, scoring 55.0 to 45.5 on the Noometry Index. Grok 4.20 Multi-Agent costs 1.9× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.

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

## Summary

- They share 20 benchmarks with published results for both. Grok 4.20 Multi-Agent scores higher in 2 categories and Grok 4.5 in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Grok 4.5 leads 60.7 to 36.6.
- The biggest single-benchmark swing is NYT Connections (extended): 89.6% for Grok 4.20 Multi-Agent and 79.9% for Grok 4.5.
- Grok 4.20 Multi-Agent is cheaper at $1.25 / $2.50 per million input/output tokens, against $2 / $6 for Grok 4.5.
- Grok 4.20 Multi-Agent accepts more context: 1M tokens versus 500K.

## Snapshot

| | Grok 4.20 Multi-Agent | Grok 4.5 |
|---|---|---|
| Provider | xAI | xAI |
| Noometry Index | 45.5 | 55.0 |
| Rank | 62 | 22 |
| Context | 1M | 500K |
| Input $/M | $1.25 | $2 |
| Output $/M | $2.50 | $6 |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4.20 Multi-Agent: 42.4 (#91)
- Grok 4.5: 51.7 (#34)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4.5 |
|---|---|---|
| LMArena Coding | 1458 | 1473 |
| DeepSWE | — | 53.8% |
| FrontierCode | — | 42.4% |
| LMArena WebDev | — | 1552 |
| SciCode | — | 54.1% |
| WeirdML | — | 46.4% |
| ALE-Bench | — | 1,309 |

## Agentic & Tool Use

- Grok 4.20 Multi-Agent: —
- Grok 4.5: 44.4 (#15)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4.5 |
|---|---|---|
| LMArena Search | 1204 | 1213 |
| APEX-Agents | — | 56.2% |
| τ²-bench Banking | — | 47.9% |
| PostTrainBench | — | 23.4% |
| GBAEval | — | 65.4% |
| GDP.pdf | — | 14% |
| Vending-Bench 2 | — | 3,887 |

## Reasoning

- Grok 4.20 Multi-Agent: 42.4 (#44)
- Grok 4.5: 56.0 (#23)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4.5 |
|---|---|---|
| NYT Connections (extended) | 89.6% | 79.9% |
| LMArena Hard Prompts | 1448 | 1462 |
| ARC-AGI-2 | — | 52.6% |
| SimpleBench | — | 70% |
| Kagi LLM Benchmark | — | 83.5% |
| ARC-AGI-1 | — | 87.2% |
| CritPt | — | 15.4% |
| Chess Puzzles | — | 36% |
| DTBench | — | 96.5% |
| LMCA | — | 45.2% |
| Surface Evolver Bench | — | 74.4% |
| Epoch Capabilities Index | — | 154.02 |

## Math

- Grok 4.20 Multi-Agent: 36.6 (#106)
- Grok 4.5: 60.7 (#29)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4.5 |
|---|---|---|
| LMArena Math | 1441 | 1457 |
| FrontierMath (Tiers 1-3) | — | 57.2% |
| FrontierMath Tier 4 | — | 24.4% |
| OTIS Mock AIME 2024-2025 | — | 97.8% |
| ProofBench | — | 31% |

## Knowledge

- Grok 4.20 Multi-Agent: 39.7 (#116)
- Grok 4.5: 62.3 (#21)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4.5 |
|---|---|---|
| LMArena Expert | 1445 | 1466 |
| GPQA Diamond | — | 93.4% |
| SimpleQA Verified | — | 48.3% |

## Multimodal

- Grok 4.20 Multi-Agent: 39.8 (#44)
- Grok 4.5: 37.8 (#63)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4.5 |
|---|---|---|
| LMArena Vision | 1259 | 1287 |
| Blueprint-Bench 2 | — | 27.3% |
| Furniture Assembly | — | 22.5% |
| LMArena Document | — | 1452 |

## Multilingual

- Grok 4.20 Multi-Agent: 54.6 (#40)
- Grok 4.5: 54.5 (#43)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4.5 |
|---|---|---|
| LMArena Non-English | 1440 | 1439 |
| LMArena Chinese | 1475 | 1497 |
| LMArena French | 1467 | 1458 |
| LMArena German | 1456 | 1448 |
| LMArena Japanese | 1405 | 1425 |
| LMArena Korean | 1416 | 1402 |
| LMArena Russian | 1457 | 1447 |
| LMArena Spanish | 1447 | 1452 |

## Instruction Following

- Grok 4.20 Multi-Agent: 75.0 (#80)
- Grok 4.5: 76.3 (#45)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4.5 |
|---|---|---|
| LMArena Instruction Following | 1420 | 1446 |

## Long Context

- Grok 4.20 Multi-Agent: 43.7 (#84)
- Grok 4.5: 44.8 (#54)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4.5 |
|---|---|---|
| LMArena Longer Query | 1430 | 1463 |

## Writing & Preference

- Grok 4.20 Multi-Agent: 64.1 (#57)
- Grok 4.5: 65.9 (#40)

| Benchmark | Grok 4.20 Multi-Agent | Grok 4.5 |
|---|---|---|
| LMArena Text | 1450 | 1448 |
| LMArena Creative Writing | 1435 | 1442 |
| LMArena Multi-Turn | 1451 | 1457 |
| EQ-Bench Creative Writing | — | 1579 |

## FAQ

### Is Grok 4.20 Multi-Agent better than Grok 4.5?

Grok 4.5 is the stronger model overall, scoring 55.0 to 45.5 on the Noometry Index. Grok 4.20 Multi-Agent costs 1.9× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.

### Which is cheaper, Grok 4.20 Multi-Agent or Grok 4.5?

Grok 4.20 Multi-Agent is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; Grok 4.5 lists at $2 and $6.

### Is Grok 4.20 Multi-Agent or Grok 4.5 better for coding?

Grok 4.5 scores higher on coding benchmarks: 51.7 versus 42.4 in the Noometry coding category.

### Which has the bigger context window?

Grok 4.20 Multi-Agent does, with 1M tokens against 500K.

### How many benchmarks do Grok 4.20 Multi-Agent and Grok 4.5 share?

20 benchmarks have published results for both models. Grok 4.20 Multi-Agent has 20 scored results on Noometry and Grok 4.5 has 52.