Source: defn.io
A Racket development environment built almost entirely by Claude—with human architects steering—now runs on iOS, closing the gap between “serious” programming languages and mobile constraints. This matters less as a productivity tool and more as proof that LLMs can execute multi-week, architecturally coherent projects when given clear scope and review cycles, turning speculative “AI programmer” claims into a shipped artifact. The fact that it happened in Lisp, a language obsessed with metaprogramming and symbolic manipulation, is significant: AI systems may work best building tools for domains that reward exploration and introspection over deterministic correctness.