arxiv:2509.25193

Devstral: Fine-tuning Language Models for Coding Agent Applications

Published on Aug 8, 2025

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Abstract

Devstral-Small is a 24 billion parameter open-source model designed for code agents that achieves competitive performance despite its lightweight size.

AI-generated summary

We introduce Devstral-Small, a lightweight open source model for code agents with the best performance among models below 100B size. In this technical report, we give an overview of how we design and develop a model and craft specializations in agentic software development. The resulting model, Devstral-Small is a small 24B model, fast and easy to serve. Despite its size, Devstral-Small still attains competitive performance compared to models more than an order of magnitude larger.

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