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A quote from Felix Rieseberg

AnnouncementProductOct 5, 2026

Anthropic has moved Cowork's model inference and virtual machine to the cloud, with each session running in its own sandbox that does not share state with other sessions. Felix Rieseberg said the change addresses user complaints about local disk, battery, and performance costs, and work stopping when laptops close. The desktop app now handles file access when the cloud VM needs device files, enabling phone use and continuous work.

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Evidence

1source· awaiting independent confirmation

No score is assigned. Sources and their independence are shown in the citation chain below.

Citation chain · 1 source

01med
simonwillison.netBloghttps://simonwillison.net/2026/Oct/5/felix-rieseberg/This source is Anthropic's own explanation of Cowork's cloud migration, with Felix Rieseberg detailing the sandbox design and the user complaints about local VM costs that motivated the change.
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OpenAICompanyAnthropicCompanyClaudeModelCoworkModelFelix RiesebergPerson
Canonical: https://simonwillison.net/2026/Oct/5/felix-rieseberg/