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Claude Code creator, Boris Cherny: "Every six months, delete your claude.md, delete your skills, delete your hooks, see what the model does, and it might surprise you." Anthropic deleted 80% of Claude Code's system prompt for Opus 5. It doesn't need the instructions past models did. 36 minutes of... show more

Alex Prompter

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84,473 views • 4 days ago •via X (Twitter)

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Claude Code creator Boris Cherny ( Boris Cherny ) "For people who aren’t building agentic products but are using Claude Code, every 6 months, delete your claude.md file, delete your skills, and delete your hooks. Then see what the model does. It might surprise you. For Opus 5, we strongly recommend trying to delete all of these things because the model may no longer need the extensive instructions that were necessary for previous models." - at Y Combinator Startup School 2026. ---- From "Y Combinator" YouTube channel, (full video link in comment)

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I deleted 80% of my CLAUDE.md last night. My CLAUDE.md was 400 lines. It's now 60. Claude works better. It's all because of this video. Two Anthropic engineers. 50 minutes. The Claude team's best practices. Anthropic deleted 80% of the Claude Code system prompt. The output got better. Most people will keep adding rules and wondering why it keeps getting worse. Watch it today, then read the guide below.

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