# Devstral Small 2505 vs Grok 4.20 Multi-Agent

> Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 33.9 on the Noometry Index. Devstral Small 2505 costs 10× 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/devstral-small-vs-grok-4-20-multi-agent
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where Grok 4.20 Multi-Agent leads 42.4 to 19.1.
- Devstral Small 2505 is cheaper at $0.10 / $0.30 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 128K.
- Devstral Small 2505 has downloadable open weights; the other is API-only.

## Snapshot

| | Devstral Small 2505 | Grok 4.20 Multi-Agent |
|---|---|---|
| Provider | Mistral AI | xAI |
| Noometry Index | 33.9 | 45.5 |
| Rank | 228 | 62 |
| Context | 128K | 1M |
| Input $/M | $0.10 | $1.25 |
| Output $/M | $0.30 | $2.50 |
| Weights | Open | Proprietary |

## Coding

- Devstral Small 2505: 38.6 (#160)
- Grok 4.20 Multi-Agent: 42.4 (#91)

| Benchmark | Devstral Small 2505 | Grok 4.20 Multi-Agent |
|---|---|---|
| SWE-bench Verified (bash only) | 56.4% | — |
| SciCode | 28.8% | — |
| LMArena Coding | — | 1458 |

## Agentic & Tool Use

- Devstral Small 2505: —
- Grok 4.20 Multi-Agent: —

| Benchmark | Devstral Small 2505 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Search | — | 1204 |

## Reasoning

- Devstral Small 2505: 19.1 (#243)
- Grok 4.20 Multi-Agent: 42.4 (#44)

| Benchmark | Devstral Small 2505 | Grok 4.20 Multi-Agent |
|---|---|---|
| Kagi LLM Benchmark | 37.7% | — |
| NYT Connections (extended) | — | 89.6% |
| CritPt | 0% | — |
| LMArena Hard Prompts | — | 1448 |

## Math

- Devstral Small 2505: —
- Grok 4.20 Multi-Agent: 36.6 (#106)

| Benchmark | Devstral Small 2505 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Math | — | 1441 |

## Knowledge

- Devstral Small 2505: —
- Grok 4.20 Multi-Agent: 39.7 (#116)

| Benchmark | Devstral Small 2505 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Expert | — | 1445 |

## Multimodal

- Devstral Small 2505: —
- Grok 4.20 Multi-Agent: 39.8 (#44)

| Benchmark | Devstral Small 2505 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Vision | — | 1259 |

## Multilingual

- Devstral Small 2505: —
- Grok 4.20 Multi-Agent: 54.6 (#40)

| Benchmark | Devstral Small 2505 | Grok 4.20 Multi-Agent |
|---|---|---|
| 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

- Devstral Small 2505: —
- Grok 4.20 Multi-Agent: 75.0 (#80)

| Benchmark | Devstral Small 2505 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Instruction Following | — | 1420 |

## Long Context

- Devstral Small 2505: —
- Grok 4.20 Multi-Agent: 43.7 (#84)

| Benchmark | Devstral Small 2505 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Longer Query | — | 1430 |

## Writing & Preference

- Devstral Small 2505: —
- Grok 4.20 Multi-Agent: 64.1 (#57)

| Benchmark | Devstral Small 2505 | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Text | — | 1450 |
| LMArena Creative Writing | — | 1435 |
| LMArena Multi-Turn | — | 1451 |

## FAQ

### Is Devstral Small 2505 better than Grok 4.20 Multi-Agent?

Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 33.9 on the Noometry Index. Devstral Small 2505 costs 10× 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, Devstral Small 2505 or Grok 4.20 Multi-Agent?

Devstral Small 2505 is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; Grok 4.20 Multi-Agent lists at $1.25 and $2.50.

### Is Devstral Small 2505 or Grok 4.20 Multi-Agent better for coding?

Grok 4.20 Multi-Agent scores higher on coding benchmarks: 42.4 versus 38.6 in the Noometry coding category.

### Which has the bigger context window?

Grok 4.20 Multi-Agent does, with 1M tokens against 128K.

### How many benchmarks do Devstral Small 2505 and Grok 4.20 Multi-Agent share?

0 benchmarks have published results for both models. Devstral Small 2505 has 4 scored results on Noometry and Grok 4.20 Multi-Agent has 20.