Code Execution & File Creation

Code execution and file creation gives Claude a secure, sandboxed computing environment where it can write and run code, manipulate files, and produce downloadable documents — all without leaving the conversation. On claude.ai (web, desktop, and mobile), this means Claude can process uploaded data, perform calculations, generate visualizations, and create professional files in formats like Excel (.xlsx), PowerPoint (.pptx), Word (.docx), and PDF. The sandbox runs Bash commands and supports multiple programming languages; Claude autonomously writes the scripts, executes them, and returns results or downloadable files directly in the chat. For API users, the feature is exposed as a tool (currently `code_execution_20250825` in public beta) that can be attached to any supported model request. A newer version, `code_execution_20260120`, adds REPL state persistence and programmatic tool calling from within the sandbox, but is limited to Opus 4.5+ and Sonnet 4.5+. Because code runs in an isolated container, the environment is separated from the user's local machine and from the broader internet unless network egress is explicitly enabled by an administrator. File uploads and downloads are both capped at 30 MB per file. Large PDFs exceeding this limit can still be passed directly into the computing environment for processing without consuming the conversational context window. The feature is available across all plans — Free, Pro, Max, Team, and Enterprise — on the web, Claude Desktop, and Claude Mobile, with no extra subscription charge beyond the plan itself.