Hacker News
'The Harness Is the Thing' Puts a Number on Model Routing: 75% Less Frontier Usage on Two $20 Plans
Scott Fryxell's August 25 post describes running a planner/worker/critic/promoter split where a frontier model does the 'prewalk' planning and refinement while commodity models such as Deepseek-v4-flash execute, cutting his frontier model usage by 75% while he runs on two $20/month subscriptions plus occasional Pi access. The layout is an AGENTS.md with skills, extensions and artifacts directories treated as a reusable jig rather than per-project config. It is a single practitioner's account with no benchmark, but it is a concrete cost structure for the routing argument that has now run several days on HN.
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