AI · Technology · 2026-09-09 17:13:00
As open source models close the gap with closed source ones, many developers seek more ownership, control and economics. This post explores the open model AI stack for agentic software development, which is surprisingly similar to using closed models: a model that answers prompts and a harness managing the interaction. The stack breaks into independent layers—models, inference providers, gateways and routers, harnesses, skills and MCP servers, and context—allowing technical decisions at each layer and rapid experimentation with new models. It covers large versus small model tradeoffs, model discovery, cloud providers and gateways, harness selection, context management, and a three-model workflow of planning, implementing and reviewing.
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