YC interview with Claude Code creator Boris Cherny covers Opus 5, prompt injection, and 80% shorter system prompts
ycombinator · x · 2026-07-28
YC publishes a Startup School 2026 talk with Boris Cherny, the creator of Claude Code, fresh off the launch of Opus 5.
The discussion covers:
- what Opus 5 changes
- how Claude Code handled prompt injection
- why the team deleted 80% of its system prompt
- how to rebuild system prompts for faster-moving models
- product overhang, “unhobbling” AI, and the next two weeks of Claude Code prompting
- running thousands of AI agents and what CS students should still learn
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