{"data":{"id":"f0473818-eb0e-43a2-b056-8a1482f2e566","title":"Quoting Felix Rieseberg","summary":"Felix Rieseberg of Anthropic describes a change to Cowork. The earlier version ran model inference in the cloud and executed tool calls in an Anthropic-provided VM installed on the user's computer, which cost disk, battery and performance and stopped work when the laptop closed. The new version runs both inference and the VM in the cloud, giving each session its own sandbox, while the desktop app handles file access requests from the VM.","solution":"N/A -- no mitigation discussed in source.","labels":["industry"],"sourceUrl":"https://simonwillison.net/2026/Oct/5/felix-rieseberg/","publishedAt":"2026-10-05T23:56:47.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"news","affectedPackages":null,"affectedPackageNames":null,"affectedPackageRefs":null,"affectedVendors":["Anthropic"],"affectedVendorsRaw":["Claude Cowork","Claude"],"classifierModel":"claude-haiku-5-5","classifierPromptVersion":"v4","summaryPromptVersion":"v2","headline":null,"headlinePromptVersion":null,"cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":null,"epssScore":null,"epssCheckedAt":null,"kevDateAdded":null,"advisoryAliases":null,"affectedPackagesSource":null,"affectedPackagesCheckedAt":null,"patchAvailable":null,"disclosureDate":"2026-10-05T23:56:47.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":null,"aiComponentTargeted":"agent","llmSpecific":true,"classifierConfidence":0.9,"researchCategory":null,"atlasIds":null}}