This Claude Opus 4.6 user guide is specifically designed to clearly explain the complete workflow—from entering a chat to switching models, organizing tasks with Projects, and uploading attachments for analysis. After you set things up step by step, Claude Opus 4.6 will deliver outputs more steadily according to your needs, and it’ll be easier to continue the same work across multiple devices.
Enter a chat and select Claude Opus 4.6
After opening Claude on the web or mobile app, first confirm your current account is logged in, then start a new chat. In the model selection area at the top of the chat, manually switch to Claude Opus 4.6 to ensure all subsequent outputs use the same model. If you use Claude Opus 4.6 frequently, it’s recommended that you check this each time you start a new chat to avoid mixing models midstream, which can lead to inconsistent style and length.
Use “Projects” to centrally manage tasks and materials
If you need to write the same proposal over the long term or maintain the same set of materials, putting the chat into a Project will be more hassle-free. You can store commonly used background information, writing guidelines, or formatting requirements in the Project so that Claude Opus 4.6 executes to the same standard every time. Within a Project, it’s recommended to write three short rules in the format of “Goal—Constraints—Output format,” which makes it easier for Claude Opus 4.6 to follow consistently.
Uploading attachments and images: Have Claude Opus 4.6 answer based on evidence
Find the upload entry near the input box. After selecting a document, spreadsheet, or image, ask your question—try to make it specific, such as “Summarize three conclusions based on page 2 of the attachment.” If you want Claude Opus 4.6 to cite sources, you can ask it to label “which paragraph/which line in the attachment it comes from,” making it easier to verify. If the attachment is long, first ask Claude Opus 4.6 to list the table of contents and key page numbers, then follow up section by section for higher efficiency.
Account switching and sync: Avoid sending materials to the wrong place
If you use multiple accounts at the same time, first confirm the current avatar and email in the account menu, then enter the chat; if necessary, use an incognito/private window to log into another account. Chat history and Projects generally don’t sync across different accounts, so after switching you should re-check whether it’s still set to Claude Opus 4.6. When continuing the same task across devices, it’s best to enter from the Project, which reduces the chance of opening the wrong chat.
Common sticking points: What to do if you can’t send messages or attachments fail
If Claude Opus 4.6 fails to send or keeps spinning, refresh the page and check your network first, then try shortening your input and resend. If attachment upload fails, prioritize using a smaller version or split it into multiple files, then have Claude Opus 4.6 process it in parts. If permission or region prompts appear frequently, try switching network environments and re-logging into your account before trying again.
