Leader profile

Boris Cherny

Boris Cherny, the creator of Claude Code at Anthropic, was born in Odesa, Ukraine, and emigrated with his family to the United States in 1995. He currently lives and works in San Francisco, California.

Current role

Role: Engineer
Company: Anthropic
Official link: https://x.com/bcherny?lang=en

Recent viewpoints

Opus 5 runs for weeks or months with Auto Mode and isn't prompt injectable.

Opus 5 can run for weeks or months at a time, especially when combined with Auto Mode, and is not prompt injectable.

Boris Cherny Opus 5 capabilities Source at 0:55

Deleted 80% of system prompt because Opus 5 is more intelligent.

We deleted 80% of Claude Code's system prompt because Opus 5 is more intelligent and doesn't need corrections.

Boris Cherny System prompt deletion Source at 3:38

Ablation shows model is smarter without prompts, but product prompts help usage.

We use ablation to evaluate prompts, finding the model is slightly more intelligent without prompts, but product prompts help usage.

Boris Cherny System prompt deletion Source at 4:32

Defines product overhang and hobbling in AI products.

Product overhang is when the model's capabilities exceed what products allow, and hobbling is when products get in the way.

Boris Cherny Product overhang Source at 10:47

Claude Code emerged from Sonnet 3.5's untapped file-writing capability.

Claude Code was born from product overhang with Sonnet 3.5, which could write files but existing products didn't let it.

Boris Cherny Product overhang Source at 11:54

Recent interviews

Boris Cherny: Building Claude Code

Jul 28, 2026

Major topics

Design IterationLast interview Aug 15, 2026 TypographyLast interview Aug 15, 2026 InternationalizationLast interview Aug 15, 2026 Visual PrototypingLast interview Aug 15, 2026 Logo DesignLast interview Aug 15, 2026 Project PlanningLast interview Aug 15, 2026 Creative CollaborationLast interview Aug 15, 2026 Meaningful DesignLast interview Aug 15, 2026 Accessible ComputingLast interview Aug 15, 2026 Design ConstraintsLast interview Aug 15, 2026