The main line of Field Notes: Evaluations, task books and pipelines — plus the numbers worth keeping, from model prices to page weight. The other four sections are on the site and in the full feed.https://field-notes-6cd.pages.dev/enhttps://field-notes-6cd.pages.dev/posts/chinese-open-weights-timeline/https://field-notes-6cd.pages.dev/posts/chinese-open-weights-timeline/Sixty-seven open-weight releases from Chinese labs, each with a date I could trace to a primary source — plus the eleven candidates I dropped, and why.Fri, 09 Oct 2026 00:00:00 GMThttps://field-notes-6cd.pages.dev/posts/hallucination-rates-in-support-ai/https://field-notes-6cd.pages.dev/posts/hallucination-rates-in-support-ai/Five kinds of error, three ways one accuracy figure misleads, and what a routing test on 3,894 public complaints actually returned.Fri, 09 Oct 2026 00:00:00 GMThttps://field-notes-6cd.pages.dev/posts/how-an-eval-set-is-built/https://field-notes-6cd.pages.dev/posts/how-an-eval-set-is-built/An eval set is an instrument with a purpose, a scoring rule, a calibration record and an expiry date. Where the samples come from, what counts as correct, and what makes the set expire.Fri, 09 Oct 2026 00:00:00 GMThttps://field-notes-6cd.pages.dev/posts/llm-api-pricing-per-task/https://field-notes-6cd.pages.dev/posts/llm-api-pricing-per-task/I priced three concrete jobs on seven model APIs using each vendor's own pricing page, and wrote down every assumption the conversion rests on.Fri, 09 Oct 2026 00:00:00 GMThttps://field-notes-6cd.pages.dev/posts/why-there-is-no-western-mini-program/https://field-notes-6cd.pages.dev/posts/why-there-is-no-western-mini-program/A mini program inherits its identity and its payment rail from the app hosting it. Here is that mechanism, and what the four Western equivalents do instead.Fri, 09 Oct 2026 00:00:00 GMThttps://field-notes-6cd.pages.dev/posts/twenty-hot-lists-no-api-keys/https://field-notes-6cd.pages.dev/posts/twenty-hot-lists-no-api-keys/An aggregator that collects 20 trending lists every night. Six sources broke in ways worth keeping a record of, and one of them is gone for good.Thu, 08 Oct 2026 00:00:00 GMThttps://field-notes-6cd.pages.dev/posts/verifying-an-email-signup/https://field-notes-6cd.pages.dev/posts/verifying-an-email-signup/The form returned success. The subscriber appeared in the right group. The one thing that failed was in an inbox I do not control.Thu, 08 Oct 2026 00:00:00 GMThttps://field-notes-6cd.pages.dev/posts/what-this-site-ships/https://field-notes-6cd.pages.dev/posts/what-this-site-ships/2,130 bytes of HTML, 1 KB of my own JavaScript, no framework. Then the newsletter form loads jQuery, and the number stops being funny.Thu, 08 Oct 2026 00:00:00 GMThttps://field-notes-6cd.pages.dev/posts/what-goes-on-this-site/https://field-notes-6cd.pages.dev/posts/what-goes-on-this-site/The scope of Field Notes, how often it updates, and why the numbers here have to come from a script.Wed, 07 Oct 2026 00:00:00 GMT