The official install is a one-line command. On macOS, Linux, or WSL, open a terminal and run:
curl -fsSL https://claude.ai/install.sh | bash
On Windows, open PowerShell and run:
irm https://claude.ai/install.ps1 | iex
Or use a package manager: brew install --cask claude-code on macOS, or winget install Anthropic.ClaudeCode on Windows. See the official quickstart for all options.
Once installed, type claude in any terminal to start your first session.