Your key stays on this machine only. Either pasted here (saved to localStorage) or loaded from a gitignored config.local.js. Never written to a tracked file, never committed to git, never logged. Requests go directly from your browser to api.anthropic.com.
✓ Using key from config.local.js. The fields below are read-only while that file is in place — edit the file directly or delete it to use the modal.
All three follow the same broker prompt. Sonnet 4.6 is the sweet spot for chat.
Get one at console.anthropic.com. Keys starting with sk-ant-. Stored only in this browser.