# Devstral Small vs Step 3.5 Flash

> Side-by-side benchmark comparison for Devstral Small and Step 3.5 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/devstral-small-vs-step-3-5-flash
- Last updated: October 14, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Devstral Small and Step 3.5 Flash share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Step 3.5 Flash has the larger published context window at 256K.

## Model Snapshot

| Property | Devstral Small | Step 3.5 Flash |
|----------|----------|----------|
| Creator | Mistral | StepFun |
| Type | Open Weight | Open Weight |
| Reasoning | Non-Reasoning | Non-Reasoning |
| Context | 128K | 256K |
| Independent public score (not head-to-head) | null | 41.96 |
| Benchmarks Covered | 1 | 3 |
| Pricing (input/output) | N/A | $0.10 / $0.30 |

## Category Breakdown

### Coding

- Winner: Insufficient shared evidence
- Devstral Small public-lane score: Coming soon
- Step 3.5 Flash public-lane score: Coming soon

| Benchmark | Devstral Small | Step 3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 46.8% | 74.4% | Step 3.5 Flash |
| LiveCodeBench v6 | Coming soon | 86.4% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Devstral Small public-lane score: Coming soon
- Step 3.5 Flash public-lane score: Coming soon

| Benchmark | Devstral Small | Step 3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | Coming soon | 97.3% | Coming soon |

## FAQ

### Is there enough evidence to pick between Devstral Small and Step 3.5 Flash?

Not yet. The models share only 1 sourced benchmark row, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Devstral Small vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-devstral-small)
- [Step 3.5 Flash vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-step-3-5-flash)
- [Devstral Small vs GPT-6.1 Sol](/compare/devstral-small-vs-gpt-6-1-sol)
- [Step 3.5 Flash vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-step-3-5-flash)

## Explore More

- [Devstral Small profile](/models/devstral-small)
- [Step 3.5 Flash profile](/models/step-3-5-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)