Mistral AI Launches Remote Agents in Vibe and Mistral Medium 3.5 with 77.6% SWE-Bench Verified Score

['Mistral AI has been quietly building one of the more practical coding agent ecosystems in the open-source/weights AI space, and they are shipping its most significant infrastructure upgrade yet. The Mistral team announced remote agents in Vibe, its coding agent platform, alongside the public preview of Mistral Medium 3.5 — a new 128B dense model that now serves as the default model in both Vibe and Le Chat, Mistral’s consumer assistant.', 'Mistral Vibe is a coding agent accessible through a CLI (command-line interface) that lets an AI model work through software tasks on your behalf — writing code, refactoring modules, generating tests, investigating CI failures, and more. Think of it as a junior developer that never gets tired and can operate across your codebase.

Until now, Vibe sessions ran locally, meaning the agent was tied to your laptop and your terminal. That changes today, as coding sessions can now work through long tasks while you’re away. Many can run in parallel, and you stop being the bottleneck on every step the agent takes.', 'The remote coding agent in Le Chat is not a standalone feature — it’s built on top of Mistral’s own orchestration layer, which is useful context if you’re thinking about how to architect similar agentic systems yourself.

On the integration side, Vibe plugs into GitHub for code and pull requests, Linear and Jira for issues, Sentry for incidents, and apps like Slack or Teams for reporting. The new released model, Mistral Medium 3.5, scores 77.6% on SWE-Bench Verified, ahead of Devstral 2 and models like Qwen3.5 397B A17B.', 'Mistral Medium 3.5 is a dense 128B model with a 256k context window, handling instruction-following, reasoning, and coding in a single set of weights. The model is also multimodal, with a vision encoder trained from scratch to handle variable image sizes and aspect ratios.

One particularly interesting design choice: reasoning effort is now configurable per request, so the same model can answer a quick chat reply or work through a complex agentic run.', 'Beyond the coding agent upgrades, Mistral is also shipping Work mode in Le Chat — a new agentic mode for more general, multi-step tasks. Work mode is a powerful new agentic mode for complex tasks in Le Chat, powered by a new harness and Mistral Medium 3.5. The agent becomes the execution backend for the assistant itself, so Le Chat can read and write, use several tools at once, and work through multi-step projects until it completes what you’ve asked.', 'In Work mode, connectors are on by default rather than chosen manually, which lets the agent reach into documents, mailboxes, calendars, and other systems for the rich context it needs to take correct action.

Transparency is a built-in feature rather than an afterthought: every action the agent takes is visible — you see each tool call and the thinking rationale. Le Chat will ask for explicit approval — based on your permissions — before proceeding with sensitive tasks like sending a message, writing a document, or modifying data.']