Claude Sonnet 5.5: smarter work, at a lower cost

Claude Sonnet 5.5 is a clear step up from Sonnet 5 across coding and knowledge work, and it gets there at a much lower cost per task. Use it to build features alongside Claude in one session, fix bugs and check work against requirements. It also turns rough notes into ready-to-share output: one-pagers, diagrams, summary slides, document edits and spreadsheet cleanup. To try it, open the app, start a new chat and choose Sonnet 5.5 from the model menu.