# Grok 4.20 Multi-Agent vs Qwen3.5 Plus

> Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 42.3 on the Noometry Index. Qwen3.5 Plus costs 1.7× 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-qwen3-5-plus
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where Qwen3.5 Plus leads 47.9 to 36.6.
- Qwen3.5 Plus is cheaper at $0.40 / $2.40 per million input/output tokens, against $1.25 / $2.50 for Grok 4.20 Multi-Agent.

## Snapshot

| | Grok 4.20 Multi-Agent | Qwen3.5 Plus |
|---|---|---|
| Provider | xAI | Alibaba (Qwen) |
| Noometry Index | 45.5 | 42.3 |
| Rank | 62 | 103 |
| Context | 1M | 1M |
| Input $/M | $1.25 | $0.40 |
| Output $/M | $2.50 | $2.40 |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4.20 Multi-Agent: 42.4 (#91)
- Qwen3.5 Plus: —

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5 Plus |
|---|---|---|
| LMArena Coding | 1458 | — |
| ALE-Bench | — | 621.92 |

## Agentic & Tool Use

- Grok 4.20 Multi-Agent: —
- Qwen3.5 Plus: —

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5 Plus |
|---|---|---|
| LMArena Search | 1204 | — |
| Vending-Bench 2 | — | 0.54 |

## Reasoning

- Grok 4.20 Multi-Agent: 42.4 (#44)
- Qwen3.5 Plus: 32.0 (#67)

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5 Plus |
|---|---|---|
| NYT Connections (extended) | 89.6% | — |
| Chess Puzzles | — | 22% |
| LMArena Hard Prompts | 1448 | — |
| Mystery Game Puzzles | — | 17% |
| DTBench | — | 80.5% |
| LMCA | — | 36.4% |
| Epoch Capabilities Index | — | 146.79 |

## Math

- Grok 4.20 Multi-Agent: 36.6 (#106)
- Qwen3.5 Plus: 47.9 (#55)

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5 Plus |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 86.7% |
| LMArena Math | 1441 | — |
| FrontierMath (Feb 2025 set) | — | 21% |
| FrontierMath Tier 4 (v1) | — | 2.1% |

## Knowledge

- Grok 4.20 Multi-Agent: 39.7 (#116)
- Qwen3.5 Plus: 46.0 (#78)

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5 Plus |
|---|---|---|
| GPQA Diamond | — | 84.8% |
| SimpleQA Verified | — | 25.4% |
| Vectara Hallucination Rate | — | 10.7% |
| LMArena Expert | 1445 | — |

## Multimodal

- Grok 4.20 Multi-Agent: 39.8 (#44)
- Qwen3.5 Plus: —

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5 Plus |
|---|---|---|
| LMArena Vision | 1259 | — |

## Multilingual

- Grok 4.20 Multi-Agent: 54.6 (#40)
- Qwen3.5 Plus: —

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5 Plus |
|---|---|---|
| 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)
- Qwen3.5 Plus: —

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5 Plus |
|---|---|---|
| LMArena Instruction Following | 1420 | — |

## Long Context

- Grok 4.20 Multi-Agent: 43.7 (#84)
- Qwen3.5 Plus: 42.9 (#109)

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5 Plus |
|---|---|---|
| CL-bench | — | 19.8% |
| CL-bench Life | — | 12.4% |
| LMArena Longer Query | 1430 | — |

## Writing & Preference

- Grok 4.20 Multi-Agent: 64.1 (#57)
- Qwen3.5 Plus: —

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5 Plus |
|---|---|---|
| LMArena Text | 1450 | — |
| LMArena Creative Writing | 1435 | — |
| LMArena Multi-Turn | 1451 | — |

## FAQ

### Is Grok 4.20 Multi-Agent better than Qwen3.5 Plus?

Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 42.3 on the Noometry Index. Qwen3.5 Plus costs 1.7× 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 Qwen3.5 Plus?

Qwen3.5 Plus is cheaper. It lists at $0.40 per million input tokens and $2.40 per million output tokens; Grok 4.20 Multi-Agent lists at $1.25 and $2.50.

### Which has the bigger context window?

Both accept 1M tokens.

### How many benchmarks do Grok 4.20 Multi-Agent and Qwen3.5 Plus share?

0 benchmarks have published results for both models. Grok 4.20 Multi-Agent has 20 scored results on Noometry and Qwen3.5 Plus has 15.