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Product / feature launchAgents & Tool Use · Large Language Models · Efficiency & Inference1 source · Oct 5, 2026

Quoting Felix Rieseberg

The "old" version of Cowork runs model inference in the cloud, executing tool calls in an Anthropic-provided VM we shipped to your computer.

Key points

  • 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.
  • The "new" version of Cowork runs model inference and the VM in the cloud.
  • When the VM needs something on the users' device (like a file), the desktop app is responsible for that file access tool call. [...]
  • Tags: claude-cowork, anthropic, claude, generative-ai, ai, general-agents, llms

Sources (1)

  • [1]Quoting Felix Rieseberg
    Simon Willison's Weblog · Oct 5, 11:56 PM
    The "old" version of Cowork runs model inference in the cloud, executing tool calls in an Anthropic-provided VM we shipped to your computer.
    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.

Extractive summary: sentences quoted from the sources.