Claude Opus 4.6 User Guide: Logging in, selecting the model, creating projects, and switching between multiple accounts

This Claude Opus 4.6 user guide mainly addresses three things: how to log in smoothly on the web, where to switch to the Claude Opus 4.6 model, and how to manage conversations with Projects and switch accounts safely. Follow the steps through, and you’ll basically straighten out, in one go, the operations that most commonly get people stuck in everyday use.

Login entry and verification: get the basic setup working first

After opening the official Claude website (claude.ai), click Log in. Common methods include an email verification code, or authorization via a Google or Apple account. If you choose email login, the code often lands in the “Promotions/Spam” folder—use the in-mail search for the subject line first, then check your filtering rules. If you’re frequently prompted that verification failed, try a different browser or open an incognito/private window first, to avoid repeated checks caused by old cached data.

After logging in, it’s recommended to immediately confirm that the account email is the one you expect—especially if you’ve previously logged in on the same device using different methods. In this Claude Opus 4.6 user guide, the most common “Why can’t I find my chat history?” is often simply because you logged into a different account.

Selecting Claude Opus 4.6 in a chat: start with the model selector

After entering a new chat page, you’ll typically see a “Model” selector at the top of the conversation or on the left sidebar (the layout varies slightly). Open it and select Claude Opus 4.6 to start chatting. If Claude Opus 4.6 isn’t in the list, it means the model isn’t available under the current account permissions or in your region/network environment. First confirm whether your account has available quota and model access.

When using Claude Opus 4.6 for the first time, it’s recommended to start by sending: “Please restate my request and provide an execution checklist.” Use its long-text comprehension to break the task down; then add materials afterward. This is more reliable than dropping a huge block of text right away.

How to use Projects: keep conversations and files in one workspace

There’s usually a Projects entry in the sidebar. Create a new project and start chats within the project so similar tasks won’t be interrupted by scattered conversations. The recommended approach in this Claude Opus 4.6 user guide is: name projects by “client/topic + goal,” then put commonly used requirements into the project description, so every new chat can reuse the same background context.

When you need to upload files, choose Attach/Upload near the input box, and use clear filenames (e.g., “Requirements_v2.pdf”). If parsing looks abnormal after uploading, first check whether the file is encrypted or too large, then try splitting it into smaller document sections and uploading again.

Switching accounts and signing out safely: avoid mixed histories and permission confusion

You can usually find “Switch account/Log out” in the avatar menu. If you have multiple Claude accounts, it’s recommended to log into different browsers separately, or isolate them using browser “Profiles.” This is less likely to mix accounts than repeatedly logging out and back in. After handling sensitive content, remember to log out on public devices and clear the site’s cache and cookies.

If you can’t find Claude Opus 4.6 on the same device or the project list looks abnormal, first check which account you’re currently logged into, then check whether you accidentally opened an incognito/private window and therefore didn’t sync. Once you make these habits consistent, most of the “something feels off after using it for a while” issues mentioned in this Claude Opus 4.6 user guide will noticeably decrease.