# Grok 4.20 Multi-Agent vs Qwen3.5-Flash

> Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 42.3 on the Noometry Index. Qwen3.5-Flash costs 8.9× 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-flash
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Grok 4.20 Multi-Agent scores higher in 7 categories and Qwen3.5-Flash in 1 category; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.20 Multi-Agent leads 42.4 to 32.9.
- Qwen3.5-Flash is cheaper at $0.10 / $0.40 per million input/output tokens, against $1.25 / $2.50 for Grok 4.20 Multi-Agent.

## Snapshot

| | Grok 4.20 Multi-Agent | Qwen3.5-Flash |
|---|---|---|
| Provider | xAI | Alibaba (Qwen) |
| Noometry Index | 45.5 | 42.3 |
| Rank | 62 | 105 |
| Context | 1M | 1M |
| Input $/M | $1.25 | $0.10 |
| Output $/M | $2.50 | $0.40 |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4.20 Multi-Agent: 42.4 (#91)
- Qwen3.5-Flash: 33.9 (#234)

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5-Flash |
|---|---|---|
| LMArena Coding | 1458 | 1412 |
| LMArena WebDev | — | 1243 |
| ALE-Bench | — | 221.8 |

## Agentic & Tool Use

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

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5-Flash |
|---|---|---|
| LMArena Search | 1204 | — |
| Vending-Bench 2 | — | 462.69 |

## Reasoning

- Grok 4.20 Multi-Agent: 42.4 (#44)
- Qwen3.5-Flash: 32.9 (#63)

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5-Flash |
|---|---|---|
| LMArena Hard Prompts | 1448 | 1404 |
| NYT Connections (extended) | 89.6% | — |
| Chess Puzzles | — | 21% |
| Mystery Game Puzzles | — | 20% |
| DTBench | — | 82.9% |
| LMCA | — | 29.1% |
| Epoch Capabilities Index | — | 143.98 |

## Math

- Grok 4.20 Multi-Agent: 36.6 (#106)
- Qwen3.5-Flash: 36.3 (#117)

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5-Flash |
|---|---|---|
| LMArena Math | 1441 | 1407 |
| FrontierMath (Tiers 1-3) | — | 18.2% |
| OTIS Mock AIME 2024-2025 | — | 84.4% |
| FrontierMath (Feb 2025 set) | — | 6.2% |
| FrontierMath Tier 4 (v1) | — | 0% |

## Knowledge

- Grok 4.20 Multi-Agent: 39.7 (#116)
- Qwen3.5-Flash: 43.2 (#84)

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5-Flash |
|---|---|---|
| LMArena Expert | 1445 | 1408 |
| GPQA Diamond | — | 82.3% |
| SimpleQA Verified | — | 20.3% |
| Vectara Hallucination Rate | — | 10.5% |

## Multimodal

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

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

## Multilingual

- Grok 4.20 Multi-Agent: 54.6 (#40)
- Qwen3.5-Flash: 50.7 (#116)

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5-Flash |
|---|---|---|
| LMArena Non-English | 1440 | 1385 |
| LMArena Chinese | 1475 | 1446 |
| LMArena French | 1467 | 1412 |
| LMArena German | 1456 | 1389 |
| LMArena Japanese | 1405 | 1369 |
| LMArena Korean | 1416 | 1344 |
| LMArena Russian | 1457 | 1379 |
| LMArena Spanish | 1447 | 1399 |

## Instruction Following

- Grok 4.20 Multi-Agent: 75.0 (#80)
- Qwen3.5-Flash: 72.8 (#133)

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5-Flash |
|---|---|---|
| LMArena Instruction Following | 1420 | 1374 |

## Long Context

- Grok 4.20 Multi-Agent: 43.7 (#84)
- Qwen3.5-Flash: 42.4 (#119)

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5-Flash |
|---|---|---|
| LMArena Longer Query | 1430 | 1392 |

## Writing & Preference

- Grok 4.20 Multi-Agent: 64.1 (#57)
- Qwen3.5-Flash: 58.2 (#117)

| Benchmark | Grok 4.20 Multi-Agent | Qwen3.5-Flash |
|---|---|---|
| LMArena Text | 1450 | 1397 |
| LMArena Creative Writing | 1435 | 1343 |
| LMArena Multi-Turn | 1451 | 1393 |

## FAQ

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

Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 42.3 on the Noometry Index. Qwen3.5-Flash costs 8.9× 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-Flash?

Qwen3.5-Flash is cheaper. It lists at $0.10 per million input tokens and $0.40 per million output tokens; Grok 4.20 Multi-Agent lists at $1.25 and $2.50.

### Is Grok 4.20 Multi-Agent or Qwen3.5-Flash better for coding?

Grok 4.20 Multi-Agent scores higher on coding benchmarks: 42.4 versus 33.9 in the Noometry coding category.

### Which has the bigger context window?

Both accept 1M tokens.

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

17 benchmarks have published results for both models. Grok 4.20 Multi-Agent has 20 scored results on Noometry and Qwen3.5-Flash has 32.