- They use the so called Fusion model to support the Tab Completion,as described in their blog:
this model is a specific builtin model dedicated for the tab auto completion, so you cannot see it in the model list.
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Yes, every auto completion request is sent to their could hosts, which you can observe the requests via the Output => Cursor Tab
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No, these auto completions or tab completion are not included in the usage limits, which means if you are a pro/business user, you have unlimited auto/tab completion.