# Devstral Small 2505 vs Grok 4 Fast

> Grok 4 Fast is the stronger model overall, scoring 39.0 to 33.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/devstral-small-vs-grok-4-fast
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. Devstral Small 2505 scores higher in 1 category and Grok 4 Fast in 1 category; 2 gaps are clear of the uncertainty.
- The widest gap is in coding, where Devstral Small 2505 leads 38.6 to 32.3.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 37.7% for Devstral Small 2505 and 66.1% for Grok 4 Fast.
- Devstral Small 2505 has downloadable open weights; the other is API-only.

## Snapshot

| | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| Provider | Mistral AI | xAI |
| Noometry Index | 33.9 | 39.0 |
| Rank | 228 | 164 |
| Context | 128K | — |
| Input $/M | $0.10 | — |
| Output $/M | $0.30 | — |
| Weights | Open | Proprietary |

## Coding

- Devstral Small 2505: 38.6 (#160)
- Grok 4 Fast: 32.3 (#264)

| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| SWE-bench Verified (bash only) | 56.4% | — |
| LMArena WebDev | — | 1160 |
| SciCode | 28.8% | — |
| WeirdML | — | 42.9% |
| LMArena Coding | — | 1429 |

## Agentic & Tool Use

- Devstral Small 2505: —
- Grok 4 Fast: 29.3 (#80)

| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |

## Reasoning

- Devstral Small 2505: 19.1 (#243)
- Grok 4 Fast: 22.5 (#179)

| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| Kagi LLM Benchmark | 37.7% | 66.1% |
| ARC-AGI-2 | — | 5.3% |
| ARC-AGI-1 | — | 48.5% |
| CritPt | 0% | — |
| LMArena Hard Prompts | — | 1413 |
| DTBench | — | 82.7% |
| Epoch Capabilities Index | — | 144.21 |
| ForecastBench | — | 60.5 |

## Math

- Devstral Small 2505: —
- Grok 4 Fast: 36.1 (#126)

| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| LMArena Math | — | 1419 |

## Knowledge

- Devstral Small 2505: —
- Grok 4 Fast: 31.5 (#211)

| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| Vectara Hallucination Rate | — | 19.7% |
| LMArena Expert | — | 1411 |

## Multilingual

- Devstral Small 2505: —
- Grok 4 Fast: 51.5 (#106)

| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | — | 1397 |
| LMArena Chinese | — | 1458 |
| LMArena French | — | 1433 |
| LMArena German | — | 1383 |
| LMArena Japanese | — | 1358 |
| LMArena Korean | — | 1359 |
| LMArena Russian | — | 1387 |
| LMArena Spanish | — | 1414 |

## Instruction Following

- Devstral Small 2505: —
- Grok 4 Fast: 73.4 (#116)

| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | — | 1388 |

## Long Context

- Devstral Small 2505: —
- Grok 4 Fast: 63.2 (#3)

| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| Fiction.LiveBench | — | 94.4% |
| LMArena Longer Query | — | 1415 |

## Writing & Preference

- Devstral Small 2505: —
- Grok 4 Fast: 60.2 (#96)

| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| LMArena Text | — | 1407 |
| LMArena Creative Writing | — | 1388 |
| LMArena Multi-Turn | — | 1414 |

## FAQ

### Is Devstral Small 2505 better than Grok 4 Fast?

Grok 4 Fast is the stronger model overall, scoring 39.0 to 33.9 on the Noometry Index.

### Is Devstral Small 2505 or Grok 4 Fast better for coding?

Devstral Small 2505 scores higher on coding benchmarks: 38.6 versus 32.3 in the Noometry coding category.

### How many benchmarks do Devstral Small 2505 and Grok 4 Fast share?

1 benchmark has published results for both models. Devstral Small 2505 has 4 scored results on Noometry and Grok 4 Fast has 30.