Claude Code Creator Reveals Opus 5 Design Insights in YC Interview

In a YC Startup School interview, Claude Code creator Boris Cherny revealed that they rewrote and removed 80% of system prompts thanks to Opus 5's injection resistance. He also highlighted that untapped frontier model capabilities offer major startup opportunities.

2026-07-26 ~ 2026-07-28 · 4 related posts

• Boris Cherny says Opus 5 resists prompt injection and Claude Code rebuilt most of its system prompt — ycombinator · 2026-07-26
• Boris Cherny explains how Claude Code cut 80% of its system prompt — Y Combinator · 2026-07-28
• Claude Code creator says startups should chase the model capabilities nobody has productized yet — ycombinator · 2026-07-28

1 near-duplicate retellings: ycombinator