About System One Models
systemonemodels.org is an independent directory for System One models: AI models that return typed, calibrated decisions instead of text. The first one is Jev, from TypeSafe AI, which was announced on 15 September 2026.
What this is
One place for everything published about the category: the models themselves, the jobs people use them for, the projects and tools built on top of them, worked recipes with code in Python and TypeScript, explainers, and a glossary. Every entry links straight to the original, and nothing here is a copy of somebody else's page.
Why it exists
The category is days old. Within a week of the launch there were community SDKs in a dozen languages, MCP servers, half a dozen awesome lists, launch coverage in five languages, and a long argument on Hacker News about whether any of this is new. All of it sits scattered across GitHub, X, Reddit, YouTube and a handful of blogs. Nobody had collected it, checked the links, or said where each claim came from. That is the gap this site fills.
What gets listed, and how
Anything with a public link a developer would want to open: projects, tools and SDKs, official cookbooks, videos, articles, discussion threads, awesome lists, and open-source alternatives that cover similar ground. An entry needs a working public URL, and its one-line summary has to match what is actually at that URL.
Every factual claim about a model, meaning price, latency, limits, versions and access, carries a source URL in the page's frontmatter and renders in a Sources block you can check. Recipe code is written against the vendor's own SDK documentation, and each recipe lists the exact pages it was verified against.
Verified on an entry means one thing: someone here opened the link and confirmed it matches the summary. It is not a quality rating, an endorsement, or a security review. Entries that have not been through that check are marked as not verified rather than quietly dropped.
Independence
This site is not affiliated with TypeSafe AI or any model vendor. Nobody pays to be listed and there is no paid placement at launch. If that ever changes, it will be labelled on the page it affects rather than disclosed once and forgotten. Model and product names are the trademarks of their owners, used here to describe what the entries are about.
The structure assumes more models are coming. Right now Jev is the only System One model that exists, which is why so much of the content is about it.
Who runs it
Tim, who builds developer-facing sites, at timmyships.com. It is a one-person project, which is worth knowing whenever something here reads like a verdict.
Corrections
If something here is wrong, out of date, or unfairly summarised, use the submission form and pick Correction or something else. Corrections are made the same way every other change is, as a commit with a date on it, and pages show when they were last updated. Removal requests from the authors of listed work are honoured without argument.
How to reach us, and how to submit
The submission form takes all of it: a project or link you want listed, a new System One model, a correction, or anything else you want to say.
How the site is built
Astro, generated as static HTML, with no database. The only server-side code is the Worker behind the submission form, which emails what you send and keeps no copy. All content lives in a git repository as markdown files with typed frontmatter, so every edit has a diff and a timestamp. Search runs on Pagefind over the same HTML you are reading. Analytics is Google Analytics 4, described on the privacy page.