Devstral Small 1.1 is an Apache 2.0 open-source agentic coding model with 46.8% on SWE-bench Verified, built jointly by Mistral AI and All Hands AI.
import { streamText } from 'ai'
const result = streamText({ model: 'mistral/devstral-small', prompt: 'Why is the sky blue?'})Released May 7, 2025, Devstral Small 1.1 was built as a collaboration between Mistral AI and All Hands AI, the team behind the OpenHands agent scaffold. That partnership shaped Devstral Small 1.1's design for resolving real GitHub issues, giving it practical competency in the messy, context-dependent bugs that appear in production repositories.
At 46.8% on SWE-bench Verified, Devstral Small 1.1 outperformed previous open-source models by more than six percentage points at release. Under the OpenHands scaffold, it exceeded larger models like Deepseek-V3 (671B) and Qwen3 (232B). These results reflect efficient use of its parameter budget rather than scale.
Devstral Small 1.1 integrates with OpenHands, SWE-Agent, Ollama, LM Studio, and other tooling ecosystems.