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Reverse engineering Claude Code (April 2025)


I’ve been curious about what happens inside Claude Code so I’ve spent a couple hours digging through prompts that it sends back to Anthropic. As I’ve been going through that, I’ve gathered some insights why Claude Code is often slower and more expensive than other tools like Cursor.

The very first thing you see is that Claude Code tries to figure out whether what you have entered is a continuation of the previous conversation or a new topic. Overall, Claude Code tends to be more generic and secure for the price of extra time and money billed on more tokens. Still, in terms of UX, Claude Code is the winner for an agentic tool that runs in console.

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