This article clearly explains the common operations for Claude Opus 4.6: from sign-up and login, to switching to Claude Opus 4.6 within a chat, and then file uploads, session management, and multi-device sign-in. Follow the steps and you’ll basically avoid taking detours in menus and settings.
Sign-up and login: stabilize your account status first
After opening the Claude official website, follow the prompts to log in with email or a third-party account. If you register with email, remember to check the verification email and complete verification; otherwise, some features may be restricted later. After your first entry, it’s recommended to create a test conversation first to confirm you can send messages normally and receive replies. Then start using Claude Opus 4.6 for formal tasks—it will be more reliable.
Select Claude Opus 4.6 in a chat: avoid using the wrong model
After entering any chat page, first find the model selection entry at the top and choose Claude Opus 4.6 from the list. Select Claude Opus 4.6 before sending your first request to reduce context breaks caused by switching models midstream. If you find the reply style or capability doesn’t meet expectations, first confirm that the current chat really shows Claude Opus 4.6, and then consider adjusting your prompt.
File upload and reading: use Claude Opus 4.6 for summarization and extraction
Near the input box, find the upload/attachment entry, add a PDF, document, or image, and then directly state what you want Claude Opus 4.6 to do—for example, “outline by chapter,” “extract key points from the tables,” or “provide an actionable revision checklist.” If the file is large, first have Claude Opus 4.6 read only the table of contents or the first page to confirm the parsing direction is correct, and then have it dive into a closer read. This can significantly reduce repeated uploads and rework.
Switching accounts and multi-device login: the easiest approach
When you need to switch accounts, prioritize using “Log out” and then logging in again, to avoid a session still being tied to the original account if you only close the page. If you often switch among multiple Claude Opus 4.6 accounts on the same computer, it’s recommended to use different browser user profiles (Profiles) to log in separately, so each one’s cookies and sessions don’t interfere with each other. Using Claude Opus 4.6 on both phone and computer at the same time is generally fine, but if you encounter repeated page redirects or login getting stuck, clearing the site’s cache/cookies and then logging in again usually resolves it.
