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Reverse Engineering Cursor's LLM Client


Reverse Engineering Cursor's LLM Client

It turns out that Cursor first sends a request to its own servers, where additional processing happens before making the LLM call, so it couldn’t connect to our gateway on localhost. We find it remarkable that there isn’t more here and that all of software engineering has been internalized enough by the current generation of LLMs that you can get the brains behind Cursor with a 642-token system prompt. In our next post of this series, we’ll explain how we’re evaluating real-world usage of AI coding assistants, along with the results of our internal A/B testing between models.

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LLM Client