Anthropic moves Claude Cowork's VM and inference fully into the cloud
Anthropic's Felix Rieseberg described an architecture change for Claude Cowork: the old version ran model inference in the cloud but executed tool calls in an Anthropic-provided VM shipped to the user's computer, added for capability, safety and security reasons and mapping in only the data explicitly added to a session. The new version runs both inference and the VM in the cloud, with each session getting its own sandbox that shares no state with others; when the VM needs something on the user's device, such as a file, the desktop app handles that file-access tool call. Rieseberg said this addresses complaints about the local VM's disk, battery and performance cost, and about work stopping when a laptop is closed.