Open-source Claude Code skill: Opus plans, cheap models build, up to 49% cheaper
Apprehensive_Sky5123 · reddit · 2026-11-13
The author open-sourced a free MIT-licensed Claude Code skill called 'foreman' that cuts coding costs via multi-model orchestration: Opus agrees on a plan once and splits it into milestones and stages; each stage goes to a cheaper worker (Sonnet or Haiku by default, or Codex, Gemini, opencode); Opus reviews every piece and bounces failures back with reasons; nothing merges to main without human approval, with review packets and test plans at each milestone.
Cost figures come from the author's own run logs, not public benchmarks: the best of 13 builds cost 49% less than Opus alone (API prices), and October projects averaged 25% savings. Failed reviews that trigger rework erode savings, so a sharp upfront plan matters more than which model builds.
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