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If your concern is where an AI agent processes work, which local files or browser sessions it can reach, or who governs it, the best Claude Cowork alternative depends on that specific requirement. Microsoft 365 Copilot Cowork is a strong ecosystem candidate for organizations already using Microsoft 365; ChatGPT agent is another option to investigate, but the available documentation does not establish feature parity. First separate cloud execution from access to your own device: Claude Cowork can use both paths, and they are not the same thing.
What does “outside Anthropic’s sandbox” mean?
It can mean several different things: keeping agent execution off Anthropic-managed infrastructure, using another provider’s identity and administration system, avoiding a desktop app that bridges access to local files, or choosing an agent integrated with a work suite your organization already uses. These are distinct requirements. A different product is not automatically local-running, and local access does not necessarily mean the agent’s processing stays on your device.
How Claude Cowork handles cloud execution and local access
As of October 6, 2026, new Cowork tasks on Claude Pro and Max run in the cloud. Tasks that were already running locally before the change can remain on the computer until they finish. Anthropic describes this change and its exceptions in its guide to using Cowork across web, desktop, and mobile.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteCloud execution does not remove every desktop dependency. Local files remain on the computer, but Cowork accesses connected folders through the Claude Desktop app; for a cloud task to reach those files, the app must be open. Local connectors and plugins that use local MCP servers also require the desktop app. So the relevant question is not simply “cloud or local?” but whether a task’s execution, data processing, and device access meet your requirements.
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What Anthropic says happens to data
Anthropic says cloud sessions run in isolated, temporary sandboxes on Anthropic-managed infrastructure. Its architecture overview describes limits on network reachability and short-lived session tokens, and states that work—including local files opened through the desktop app—is processed on Anthropic’s servers. These are Anthropic’s descriptions of its architecture, not an independent security audit. Review the Claude Cowork architecture overview against your organization’s data rules.
Which alternatives are worth evaluating?
Microsoft 365 Copilot Cowork
For an organization whose work already lives in Microsoft 365, Copilot Cowork is a concrete ecosystem alternative to evaluate, particularly if local browser workflows in Edge and tenant policies matter. Microsoft Learn says it became generally available to Microsoft 365 Copilot tenants worldwide in tier-1 languages in June 2026. Its updates describe local browser use in Microsoft Edge with existing sign-ins and organizational policies, as well as governance and Purview integration guidance. See Microsoft Learn’s Copilot Cowork updates.
Microsoft’s product article describes tasks spanning inbox workflows, research, structured documents, and web pages. That is the vendor’s account of the product, not independent evidence of effectiveness or quality. It also does not establish that all work runs locally or that Copilot Cowork matches Claude Cowork in every task. See Microsoft’s Copilot Cowork product article.
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ChatGPT agent
OpenAI’s announcement, “Introducing ChatGPT agent: bridging research and action,” makes it a reasonable adjacent candidate if you are looking for an agentic workflow. The cited announcement does not establish its current execution location, local-file access, browser interaction, plans, or governance in enough detail for a direct capability comparison. Verify those details in current official documentation before treating it as a fit for a specific data or administration requirement.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Compare the data path and controls before choosing
Use these questions to turn a broad “alternative” search into requirements you can verify with each vendor and your administrator:
- Execution and processing: Where does the agent loop run? Where are prompts, files, and outputs processed and stored?
- Local access: Can the agent read or write local folders? Does that access depend on an always-open desktop app or another bridge?
- Browser work: Does it use a built-in, remote, or user’s browser? Which sign-ins and organizational policies apply?
- Work ecosystem: How does it fit your identity provider, files, messaging, calendar, and administration platform?
- Availability: Which plan, device, region, or tenant settings are required? Confirm current availability rather than assuming it from a product announcement.
- Controls: What permissions, approval steps, logging, retention, and administrative controls are available?
The documented facts support comparing these dimensions, but they do not support a universal winner or an independent head-to-head quality ranking. Treat performance as a separate question to evaluate with approved, non-sensitive work rather than inferring it from product descriptions.
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Account for safety and governance in the evaluation
Anthropic’s safety guidance says cloud Cowork sessions run on Anthropic’s servers and that local-file content opened through the desktop app is processed there. It advises care with sensitive files and signed-in sites. It also says computer use directly clicks, types, and navigates the screen without the permission checks that gate other Cowork tools. The architecture overview says local folders are limited to those the user connects and that a cloud session cannot reach a device while the desktop app is offline. Read Anthropic’s Cowork safety guidance alongside its architecture overview.
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Isolation and other vendor-described safeguards are useful details to assess, not categorical guarantees. Map each product’s data path and controls to your organization’s requirements, then conduct an approved evaluation using non-sensitive work. For a Microsoft 365 tenant, include the organization’s policies and governance guidance in that evaluation; for any option, confirm that the exact workflow you need is available to your users.
Quick Recap
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