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 meant keeping a local terminal busy for the duration of a task. Remote agents decouple task execution from your machine. You queue work, the agent runs independently, and you review a pull request — closer to delegating a ticket than pair-programming in a live session. This guide covers what Medium 3.5 is, how Vibe remote agents work, how to set up both, and when self-hosting makes more sense than the API. What Is Mistral Medium 3.5? Mistral Medium 3.5 is a 128B dense model released April 29, 2026.…