How Anthropic ships the #1 LLM in the World — with Katelyn Lesse and Angela Jiang
Anthropic heads of engineering and product Katelyn Lesse and Angela Jiang discuss the architectural, infrastructural, and product trade-offs behind shipping Opus 5.5 and Claude Managed Agents. They explore rewrites from Python to Rust using Claude, protecting reasoning traces from distillation while preserving developer experience, and isolating agent brains from hands for safety and reliability.
- Anthropic built Claude Managed Agents around a strict separation between the orchestrator (the brain) and the execution environment (the hands). Read →
- Anthropic set up formal verification programs for offensive cyber and life sciences to govern access to dual-use model capabilities. Read →
- Katelyn Lesse requires Anthropic engineers to read and edit AI outputs before sharing them, preventing reviewers from wasting time parsing unvetted text. Read →
- Anthropic migrated its primary Messages API from a Python monolith to Rust despite having zero Rust developers on the engineering team. Read →