Stored only in this browser's localStorage and sent only to api.anthropic.com. Use a separate key with a monthly spend limit.
Sonnet 5.5: $2 / $10 per million input / output tokens, $2.50 cache write, $0.20 cache read. Haiku 5.5: $0.10 / $0.50. Web search: $0.01 per search. ₹ at ~88 per $. This log lives in this browser only; the Anthropic Console billing page is the authoritative record.
Everything is stored in this browser (IndexedDB): each source, its research notes, and every version generated from it.
Haiku fetches the page with Anthropic's web fetch tool. Pages behind logins or paywalls won't work. YouTube pages don't include transcripts; paste those instead.
Haiku cleans it up (fixes transcription errors, drops filler) and structures it into a fixed content spine that every version is made from. You can review and edit it before saving.