Mistral Vibe Remote Agents: Medium 3.5 Developer Guide

Two things happened in late April 2026 that are worth understanding together. Mistral released Medium 3.5 , a 128B dense open-weight model that replaces both Devstral 2 and Magistral in a single set of weights. At the same time, they shipped remote agents for their Vibe coding platform — cloud-based sessions that run in isolated sandboxes, open pull requests, and notify you when they're done. The combination changes how you think about AI coding workflows. Until now, running an AI coding agent m