How I made a 20B model code like a frontier one — by fixing the harness, not the model
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A coding agent is a model plus a harness. We spend all our attention on the model. I spent mine on the harness — and a free 20B model started finishing tasks that used to need a frontier one. I build Ajna , a terminal coding agent written in pure Python — no third-party packages, no build step, ~18…
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- 2026-10-24 20:11 · DEV Community — AI
How I made a 20B model code like a frontier one — by fixing the harness, not the model