If you've never heard of GrapheneOS, think of it as a privacy and security-focused mobile operating system that includes Android compatibility and is developed as a non-profit, open-source project. GrapheneOS, which began in 2014 as CopperheadOS, achieves its heightened security by way of sandboxing, exploit mitigations, and the Android permission model. This alternative mobile OS mitigates entire classes of vulnerabilities to make exploiting the OS exponentially more difficult.
Anthropic released sandboxing capabilities for Claude Code and launched a web-based version of the tool that runs in isolated cloud environments. The company introduced these features to address security risks that arise when Claude Code writes, tests, and debugs code with broad access to developer codebases and files. According to Anthropic, "Giving Claude this much access to your codebase and files can introduce risks, especially in the case of prompt injection."