Mistral AI releases Medium 3.5 and extends Vibe to remote agents controllable from Le Chat

Mistral AI releases its 128B Medium 3.5 model with open weights and updates Vibe to support remote agents controlled directly via a new Le Chat Work mode.

Mistral AI unveiled Medium 3.5, its new flagship model available in public preview, along with a series of developments for Vibe and Le Chat. The model is a dense 128-billion-parameter model, featuring a 256,000-token context window and configurable reasoning capabilities. It merges instruction following, reasoning, and code generation into a single architecture, becoming the default model on both Vibe and Le Chat. Mistral AI is releasing it with open weights, under a modified MIT license. The publisher is also adding remote agents to Vibe, its AI-assisted development environment. Multiple agents can be launched in parallel in the cloud, from the command-line interface or directly from Le Chat. A locally initiated session can be transferred to a remote runtime mid-workflow, with its entire context (history, task status, approvals, and diffs) preserved from one environment to another. Ultimately, the agent returns a completed branch or a draft pull request. Le Chat also gains a new Work mode, designed for long and multi-step tasks. A prompt described in natural language within the chat can thus trigger the execution of a complete development workflow on the remote runtime, without any interface switching between the request's formulation and the delivery of the result.