Boris Cherny on Trying to Get Claude Code to Rewrite the Claude App

In an interview at Y Combinator's Startup School 2026, Boris Cherny, head of Claude Code at Anthropic, discussed directing Claude to perform difficult tasks, noting the skill is less about prompt engineering and more about giving the model harder problems. He also mentioned Opus 5's ability to run for long periods and that Claude Code deleted 80% of its system prompt.

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