Boris Cherny explains that with Opus 5, 80% of Claude Code's system prompt was deleted because the model is more intelligent, recommending that AI product builders delete prompts, skills, and hooks every six months and rebuild them only when the model stumbles. He introduces 'product overhang'—the idea that current models have unrealized capabilities developers can unlock. Cherny demonstrates that modern models can rewrite entire codebases between languages, citing the Bun team's success in rewriting code from Zig to Rust in 11 days. He advises treating Claude Code like a coworker, taking an empirical approach rather than over-specifying tasks, and notes that Claude Code can spawn thousands of agents for maintenance tasks, freeing engineers to focus on shipping products. While coding is solved for his type of work, challenges remain with deep systems and UI verification.