When using Claude Opus 4.6, what most often gets people stuck isn’t not knowing how to use it, but that it “suddenly stops working.” This FAQ compiles actionable steps for high-frequency situations such as the model being unselectable, slow/interrupted responses, quota and long-text limits, and export failures.
What to do if you can’t find Claude Opus 4.6 or switch to it
Whether Claude Opus 4.6 is selectable is usually related to your current account plan permissions, regional availability, and whether the page has refreshed to the latest state. First log out and log back in, then manually switch in the model selector to avoid being stuck in an old session’s cached state.
If you still can’t see Claude Opus 4.6, try a different browser or an incognito window to rule out extension interference—especially script, ad-blocking, and proxy/VPN-type extensions. Corporate/school networks may also block some resources; switching to a mobile hotspot is often a quick way to verify whether it’s a network issue.
How to handle Claude Opus 4.6 being slow, stuck, or stopping midway
During peak hours, Claude Opus 4.6 may queue or generate more slowly. Prioritize two things: shorten what you send in a single input (provide background materials in segments), and split the task into “outline first, then write section by section.” This can significantly reduce the chance of interruptions during generation.
If message sending fails or it keeps spinning, refresh the page and continue from the “last successfully received reply”—don’t keep clicking Send repeatedly. Frequent retries on the same question may trigger risk controls; a more stable approach is to wait a moment before sending again, or start a new chat, re-ask the question, and include the necessary context.


