Essays on evals, cost models and how we work, by the people who do the work.https://northitech.in/en-gbhttps://northitech.in/writing/cost-model-is-a-deliverable/https://northitech.in/writing/cost-model-is-a-deliverable/The first question about any production AI system should be the cost per request at volume. Most teams find out in month three from the invoice.Thu, 30 Jul 2026 00:00:00 GMThttps://northitech.in/writing/publish-the-evals/https://northitech.in/writing/publish-the-evals/A model without its evaluation set is a demo. The eval set is the contract: it says what the model is for, what it is not for, and how we would know if it stopped working.Thu, 18 Jun 2026 00:00:00 GMThttps://northitech.in/writing/pyramid-is-the-problem/https://northitech.in/writing/pyramid-is-the-problem/Most failed engagements were staffed by capable people. They failed because the person who understood the problem was not the person who built the solution.Sat, 02 May 2026 00:00:00 GMT