# Devstral Small 2505 vs Step 2 16k Exp 202412

> Step 2 16k Exp 202412 is the stronger model overall, scoring 39.2 to 34.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/devstral-small-vs-step-2-16k-exp-202412
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where Step 2 16k Exp 202412 leads 25.9 to 19.7.
- Devstral Small 2505 has downloadable open weights; the other is API-only.

## Snapshot

| | Devstral Small 2505 | Step 2 16k Exp 202412 |
|---|---|---|
| Provider | Mistral AI | StepFun |
| Noometry Index | 34.3 | 39.2 |
| Rank | 233 | 171 |
| Context | 128K | — |
| Input $/M | $0.10 | — |
| Output $/M | $0.30 | — |
| Weights | Open | Proprietary |

## Coding

- Devstral Small 2505: 38.9 (#166)
- Step 2 16k Exp 202412: 38.5 (#174)

| Benchmark | Devstral Small 2505 | Step 2 16k Exp 202412 |
|---|---|---|
| SWE-bench Verified (bash only) | 56.4% | — |
| SciCode | 28.8% | — |
| LMArena Coding | — | 1316 |

## Reasoning

- Devstral Small 2505: 19.7 (#252)
- Step 2 16k Exp 202412: 25.9 (#142)

| Benchmark | Devstral Small 2505 | Step 2 16k Exp 202412 |
|---|---|---|
| Kagi LLM Benchmark | 37.7% | — |
| CritPt | 0% | — |
| LMArena Hard Prompts | — | 1299 |

## Math

- Devstral Small 2505: —
- Step 2 16k Exp 202412: 36.3 (#169)

| Benchmark | Devstral Small 2505 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Math | — | 1304 |

## Knowledge

- Devstral Small 2505: —
- Step 2 16k Exp 202412: 35.2 (#187)

| Benchmark | Devstral Small 2505 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Expert | — | 1279 |

## Multilingual

- Devstral Small 2505: —
- Step 2 16k Exp 202412: 43.7 (#181)

| Benchmark | Devstral Small 2505 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Non-English | — | 1290 |
| LMArena Chinese | — | 1331 |
| LMArena Russian | — | 1324 |

## Instruction Following

- Devstral Small 2505: —
- Step 2 16k Exp 202412: 67.9 (#192)

| Benchmark | Devstral Small 2505 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Instruction Following | — | 1287 |

## Long Context

- Devstral Small 2505: —
- Step 2 16k Exp 202412: 39.7 (#170)

| Benchmark | Devstral Small 2505 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Longer Query | — | 1307 |

## Writing & Preference

- Devstral Small 2505: —
- Step 2 16k Exp 202412: 52.3 (#173)

| Benchmark | Devstral Small 2505 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Text | — | 1321 |
| LMArena Creative Writing | — | 1328 |
| LMArena Multi-Turn | — | 1292 |

## FAQ

### Is Devstral Small 2505 better than Step 2 16k Exp 202412?

Step 2 16k Exp 202412 is the stronger model overall, scoring 39.2 to 34.3 on the Noometry Index.

### Is Devstral Small 2505 or Step 2 16k Exp 202412 better for coding?

They score almost the same on coding (38.9 vs 38.5); test both on your own repository before choosing.

### How many benchmarks do Devstral Small 2505 and Step 2 16k Exp 202412 share?

0 benchmarks have published results for both models. Devstral Small 2505 has 4 scored results on Noometry and Step 2 16k Exp 202412 has 12.