# GPT-4.5 vs Grok 4.20 Multi-Agent

> Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 36.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-4-5-vs-grok-4-20-multi-agent
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. GPT-4.5 scores higher in 0 categories and Grok 4.20 Multi-Agent in 9 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.20 Multi-Agent leads 42.4 to 14.1.

## Snapshot

| | GPT-4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 36.9 | 45.5 |
| Rank | 200 | 62 |
| Context | — | 1M |
| Input $/M | — | $1.25 |
| Output $/M | — | $2.50 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-4.5: 41.8 (#102)
- Grok 4.20 Multi-Agent: 42.4 (#91)

| Benchmark | GPT-4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Coding | 1397 | 1458 |
| Aider Polyglot | 44.9% | — |
| WeirdML | 39.4% | — |
| LiveBench Coding | 75.2% | — |

## Agentic & Tool Use

- GPT-4.5: 27.6 (#92)
- Grok 4.20 Multi-Agent: —

| Benchmark | GPT-4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| Cybench | 17.5% | — |
| LMArena Search | — | 1204 |

## Reasoning

- GPT-4.5: 14.1 (#320)
- Grok 4.20 Multi-Agent: 42.4 (#44)

| Benchmark | GPT-4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Hard Prompts | 1404 | 1448 |
| ARC-AGI-2 | 0.8% | — |
| SimpleBench | 34.5% | — |
| NYT Connections (extended) | — | 89.6% |
| ARC-AGI-1 | 10.3% | — |
| EnigmaEval | 3.2% | — |
| LiveBench Reasoning | 71.1% | — |
| LiveBench Data Analysis | 64.3% | — |
| Epoch Capabilities Index | 136.74 | — |
| ForecastBench | 61.7 | — |
| LiveBench | 69% | — |

## Math

- GPT-4.5: 31.0 (#200)
- Grok 4.20 Multi-Agent: 36.6 (#106)

| Benchmark | GPT-4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Math | 1412 | 1441 |
| OTIS Mock AIME 2024-2025 | 37.8% | — |
| LiveBench Math | 69.3% | — |
| MATH Level 5 | 78.6% | — |

## Knowledge

- GPT-4.5: 32.4 (#205)
- Grok 4.20 Multi-Agent: 39.7 (#116)

| Benchmark | GPT-4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Expert | 1394 | 1445 |
| GPQA Diamond | 68.7% | — |
| Humanity's Last Exam | 5.4% | — |
| Confabulations | 13.6% | — |

## Multimodal

- GPT-4.5: 37.0 (#68)
- Grok 4.20 Multi-Agent: 39.8 (#44)

| Benchmark | GPT-4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Vision | 1195 | 1259 |
| VPCT | 45% | — |

## Multilingual

- GPT-4.5: 52.7 (#78)
- Grok 4.20 Multi-Agent: 54.6 (#40)

| Benchmark | GPT-4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Non-English | 1413 | 1440 |
| LMArena Chinese | 1421 | 1475 |
| LMArena French | 1417 | 1467 |
| LMArena German | 1457 | 1456 |
| LMArena Japanese | 1416 | 1405 |
| LMArena Korean | 1392 | 1416 |
| LMArena Russian | 1419 | 1457 |
| LMArena Spanish | — | 1447 |

## Instruction Following

- GPT-4.5: 72.8 (#129)
- Grok 4.20 Multi-Agent: 75.0 (#80)

| Benchmark | GPT-4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Instruction Following | 1404 | 1420 |
| LiveBench Instruction Following | 72.3% | — |

## Long Context

- GPT-4.5: 40.4 (#150)
- Grok 4.20 Multi-Agent: 43.7 (#84)

| Benchmark | GPT-4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Longer Query | 1406 | 1430 |
| Fiction.LiveBench | 63.9% | — |

## Writing & Preference

- GPT-4.5: 57.1 (#129)
- Grok 4.20 Multi-Agent: 64.1 (#57)

| Benchmark | GPT-4.5 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Text | 1417 | 1450 |
| LMArena Creative Writing | 1394 | 1435 |
| LMArena Multi-Turn | 1444 | 1451 |
| Short-Story Creative Writing | 75.6% | — |
| EQ-Bench Creative Writing | 1258 | — |
| LiveBench Language | 61.5% | — |

## FAQ

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

Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 36.9 on the Noometry Index.

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

They score almost the same on coding (41.8 vs 42.4); test both on your own repository before choosing.

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

17 benchmarks have published results for both models. GPT-4.5 has 42 scored results on Noometry and Grok 4.20 Multi-Agent has 20.