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Episode Details
EPISODE INFO
- Released
- July 27, 2026
- Duration
- 35m
- Channel
- Y Combinator
- Watch on YouTube
- ▶ Open ↗
EPISODE DESCRIPTION
Fresh off the launch of Opus 5, Claude Code creator Boris Cherny joins Diana Hu at Startup School 2026 to talk about what the newest models can do, how Claude Code came to be, and what it means to build products when the underlying capabilities keep accelerating. Transcript: https://www.ycrootaccess.com/p/boris-cherny-building-claude-code Apply to Y Combinator: https://www.ycombinator.com/apply Work at a startup: https://www.ycombinator.com/jobs Chapters: 00:00 — Intro 00:07 — What Makes Opus 5 Different 02:06 — Solving Prompt Injection 03:21 — Why Claude Code Deleted 80% of Its System Prompt 06:37 — Press Delete on Your AI Product 07:20 — How to Rebuild Your System Prompt 10:30 — Product Overhang and “Unhobbling” AI 14:26 — Give Claude Harder Problems 19:32 — Prompt Engineering Is Changing 21:57 — The Two-Week Claude Code Prompt 24:42 — Running Thousands of AI Agents 30:15 — Coding Is (Almost) Solved 32:20 — What Every CS Student Should Still Learn
SPEAKERS
Diana Hu
hostHost/interviewer for Y Combinator conversations.
Boris Cherny
guestCreator of Claude Code (Anthropic), speaking about building and iterating on its prompt/harness and agentic workflows.
EPISODE SUMMARY
In this episode of Y Combinator, featuring Diana Hu and Boris Cherny, Boris Cherny: We Cut 80% of Claude Code’s Prompt explores Why Claude Code deleted most prompts and scaled long-running agents Boris Cherny says Opus 5 differs from prior models by sustaining extremely long task runs (especially with Auto Mode) and showing a new level of resistance to prompt injection.
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