Developer publishes architect-loop pattern achieving 80% token reduction through orchestrated review

Developer Dan McInerney published architect-loop, a pattern that splits coding tasks between Anthropic Fable 5 as architect and OpenAI Codex as builder, achieving 80% token reduction on Fable. According to the GitHub repository, Fable handles planning and review while Codex handles implementation in fresh contexts, with specs and gates written first and Fable reviewing evidence before integration. Related projects PUA and Nudge extend the pattern across different model combinations and agent frameworks.