# Anthropic added Claude Cowork sessions to web and mobile > Source: > Published: 2026-08-12 21:28:43+00:00 On [July 7, 2026](https://support.claude.com/en/articles/12138966-release-notes?ref=runtimewire), Anthropic, the AI company co-founded and led by Dario Amodei, added Claude Cowork to web and mobile. The update allowed users to start, steer, review and resume the same session across Claude Desktop, web and mobile. [Claude on X](https://x.com/claudeai/status/2087635263774232617?ref=runtimewire) Anthropic says those sessions are attached to the user's account instead of a particular device. Someone can start a task on the web, leave the computer and resume the work elsewhere without rebuilding the context. Claude in [Chrome](https://claude.com/claude-in-chrome?ref=runtimewire) remained a separate browser chat and task surface. The release followed the product direction Anthropic's co-founders have pursued since starting [Anthropic](https://www.anthropic.com/company?ref=runtimewire) in 2021. Amodei previously led large-language-model research including GPT-2 and GPT-3 as OpenAI's vice president of research. He earned a doctorate in biophysics from Princeton and completed postdoctoral work at Stanford's medical school, according to [his biography](https://darioamodei.com/?ref=runtimewire). Anthropic's founding pitch centered on making powerful AI systems easier to understand and control. Cowork applies that thesis to an agent that can read files, browse sites, run code and act inside other software, according to Anthropic's [architecture overview](https://support.claude.com/en/articles/14479288-claude-cowork-architecture-overview?ref=runtimewire). ### The account becomes the agent's home The July change made the Claude account the state layer for an ongoing Cowork job, allowing a user to move among supported Claude apps while retaining the session and its files. Anthropic's [Cowork documentation](https://support.claude.com/en/articles/15520349-use-claude-cowork-on-web-desktop-and-mobile?ref=runtimewire) says sessions and files remain available across Claude Desktop, web and mobile. Anthropic's [Chrome guide](https://support.claude.com/en/articles/12012173-get-started-with-claude-in-chrome?ref=runtimewire) describes a separate side-panel interface for browser chat and tasks. Its [admin documentation](https://support.claude.com/en/articles/13065128-claude-in-chrome-admin-controls?ref=runtimewire) gives organizations controls over employee access to that extension. The July change removed a routine source of friction in agent software. Long tasks can break when a user changes devices, closes a laptop or leaves the interface where the job began. Account-bound Cowork sessions preserve the work across Anthropic's supported desktop, web and mobile apps. Claude in Chrome can be used alongside Cowork for browser-based work. Anthropic describes workflows in which Chrome gathers information from the web and Cowork turns it into an Excel model, comparison deck or report. Anthropic presents these as product examples and has not disclosed customer-adoption measures for them. Availability remained layered as of August 12, 2026. Anthropic says the Chrome extension is available on all paid plans. [Cowork on web and mobile](https://support.claude.com/en/articles/15520349-use-claude-cowork-on-web-desktop-and-mobile?ref=runtimewire) is in beta and was rolling out over several weeks starting with Max users, with more plans to follow. Cowork on desktop is generally available on macOS and Windows. ### Cowork's expansion beyond the desktop Anthropic introduced Cowork as a macOS research preview for Max subscribers on [January 12](https://support.claude.com/en/articles/12138966-release-notes?ref=runtimewire), then added Pro access on [January 16](https://support.claude.com/en/articles/12138966-release-notes?ref=runtimewire). On [April 9](https://support.claude.com/en/articles/12138966-release-notes?ref=runtimewire), Anthropic made the desktop product generally available on macOS and Windows. The larger architectural change arrived on [July 7](https://support.claude.com/en/articles/12138966-release-notes?ref=runtimewire), when Anthropic added Cowork to web and mobile. That release associated sessions and files with the user's Claude account, allowing work to resume across desktop, web and mobile. Chrome continued to provide a browser side panel for chats and browser tasks. The sequence took Cowork from a desktop agent to an account-level service spanning Anthropic's supported Claude apps. RuntimeWire [reported earlier this week that Anthropic kept Sonnet 5 pricing unchanged](/article/anthropic-keeps-sonnet-5-cheap-as-ai-model-commoditization-accelerates), preserving its bid for cost-sensitive agent workloads. Session continuity addresses another part of that contest: whether people can fit an agent into daily work without repeatedly moving context between products and devices. ### A wider security boundary Persistent Cowork sessions increase the amount of software and information an agent can encounter across Claude's supported surfaces. When users combine Cowork with browser or desktop integrations, Claude may gain access to signed-in pages, files, email, documents and other untrusted content. Anthropic's [Chrome safety guidance](https://support.claude.com/en/articles/12902428-use-claude-in-chrome-safely?ref=runtimewire) identifies prompt injection as a central risk. A malicious instruction hidden in a webpage, email or document can try to redirect the agent toward an unintended action. Anthropic recommends reviewing sensitive actions and keeping human oversight around high-stakes work. Anthropic's [permissions guide](https://support.claude.com/en/articles/12902446-claude-in-chrome-permissions-guide?ref=runtimewire) says Automatically approve reviews each action for safety and blocks actions it identifies as unsafe. Selecting Skip all approvals means actions are not checked automatically. Those settings raise the importance of monitoring browser tasks for unexpected behavior or malicious instructions. Anthropic's [Cowork safety documentation](https://support.claude.com/en/articles/13364135-use-claude-cowork-safely?ref=runtimewire) says Claude can take screenshots to understand a computer screen. Anthropic advises users to avoid sensitive sites and supervise tasks that could expose important information or trigger consequential actions. Cowork adds another layer because it can combine read access with actions. Anthropic recommends limiting file and website access and monitoring tasks for unexpected behavior. Its [architecture overview](https://support.claude.com/en/articles/14479288-claude-cowork-architecture-overview?ref=runtimewire) says cloud sessions run in isolated, temporary environments on Anthropic-managed infrastructure. Claude can still use the files, apps and permissions a user grants during a task. Account-bound sessions make Cowork easier to carry through the workday. They also give administrators and users a larger permission boundary to manage whenever Claude can read private material or act through connected software.