Codex Moves Builder Work From Coding to Specification
Matias Castello, product lead at Alchemy, argues that Codex is shifting software work from writing code toward specifying intent, constraints and preferences clearly enough for an agent to act. In a conversation with OpenAI’s Romain Huet, Castello describes using Codex for code review, product documents, backlog creation, feature experiments and personal projects, with human judgment reserved for deciding what should ship. His central claim is that the limiting factor is increasingly not implementation capacity but how well builders can communicate what they want.
OpenAI·May 29, 2026·11 min read
