# Devstral Small 2505 vs Step 5 Preview

> Step 5 Preview is the stronger model overall, scoring 43.8 to 33.9 on the Noometry Index. Devstral Small 2505 costs 9.5× less per token, which makes it the better buy when Step 5 Preview's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/devstral-small-vs-step-5-preview
- Last updated: 2026-10-10
- Shared benchmarks: 2

## Summary

- They share 2 benchmarks with published results for both. Devstral Small 2505 scores higher in 0 categories and Step 5 Preview in 2 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Step 5 Preview leads 38.0 to 19.1.
- The biggest single-benchmark swing is SciCode: 28.8% for Devstral Small 2505 and 58.9% for Step 5 Preview.
- Devstral Small 2505 is cheaper at $0.10 / $0.30 per million input/output tokens, against $1 / $2.70 for Step 5 Preview.
- Step 5 Preview accepts more context: 1.02M tokens versus 128K.
- Devstral Small 2505 has downloadable open weights; the other is API-only.

## Snapshot

| | Devstral Small 2505 | Step 5 Preview |
|---|---|---|
| Provider | Mistral AI | StepFun |
| Noometry Index | 33.9 | 43.8 |
| Rank | 228 | 78 |
| Context | 128K | 1.02M |
| Input $/M | $0.10 | $1 |
| Output $/M | $0.30 | $2.70 |
| Weights | Open | Proprietary |

## Coding

- Devstral Small 2505: 38.6 (#160)
- Step 5 Preview: 50.6 (#40)

| Benchmark | Devstral Small 2505 | Step 5 Preview |
|---|---|---|
| SciCode | 28.8% | 58.9% |
| SWE-bench Verified (bash only) | 56.4% | — |
| LMArena WebDev | — | 1569 |

## Reasoning

- Devstral Small 2505: 19.1 (#243)
- Step 5 Preview: 38.0 (#58)

| Benchmark | Devstral Small 2505 | Step 5 Preview |
|---|---|---|
| CritPt | 0% | 20.9% |
| Kagi LLM Benchmark | 37.7% | — |

## FAQ

### Is Devstral Small 2505 better than Step 5 Preview?

Step 5 Preview is the stronger model overall, scoring 43.8 to 33.9 on the Noometry Index. Devstral Small 2505 costs 9.5× less per token, which makes it the better buy when Step 5 Preview's lead doesn't matter for your workload.

### Which is cheaper, Devstral Small 2505 or Step 5 Preview?

Devstral Small 2505 is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; Step 5 Preview lists at $1 and $2.70.

### Is Devstral Small 2505 or Step 5 Preview better for coding?

Step 5 Preview scores higher on coding benchmarks: 50.6 versus 38.6 in the Noometry coding category.

### Which has the bigger context window?

Step 5 Preview does, with 1.02M tokens against 128K.

### How many benchmarks do Devstral Small 2505 and Step 5 Preview share?

2 benchmarks have published results for both models. Devstral Small 2505 has 4 scored results on Noometry and Step 5 Preview has 3.