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A quote from Felix Rieseberg Simon Willison’s Weblog Subscribe 5th October 2026 The "old" version of Cowork runs model inference in the cloud, executing tool calls in an Anthropic-provided VM we shipped to your computer. We added the VM for capability, safety, and security reasons - mapping in just the data you explicitly added to your session. People loved what they were able to do with Claude but didn't love the disk, battery, and performance cost of running the VM locally. Also, people didn't love that closing your laptop means the work stops. The "new" version of Cowork runs model inference and the VM in the cloud. Each session gets its own sandbox, not sharing state with other sessions. When the VM needs something on the users' device (like a file), the desktop app is responsible for that file access tool call. [...] We think this solves a lot of problems we've heard about (like using Cowork from a phone, keeping work running, or getting all the same power without losing battery to the VM) — Felix Rieseberg, Anthropic, see also this help page Recent articles We're going to need default hard budget caps on pretty much everything - 3rd October 2026 OpenAI DevDay 2026 live blog - 29th September 2026 2026 in LLMs (so far) - 27th September 2026 This is a quotation collected by Simon Willison, posted on 5th October 2026. ai 2,261 generative-ai 2,004 llms 1,971 anthropic 345 claude 315 claude-cowork 4 general-agents 16 Disclosures Colophon © 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026