OpenModel 0.1: what a model costs, from the provider that bills you (#212)

There is no shortage of places to look up an AI model and nowhere to look
up what it costs you, from the provider that will bill you, in a form a
program can read. Every provider publishes prices as a marketing page and
every comparison site scrapes those pages. The best of them, models.dev,
is a community database: 8,179 provider offerings across 223 providers,
maintained by volunteers reading pricing pages. Good work, and still a
third party writing down what a company charges.

OpenModel is that table served by its author at
/.well-known/openmodel.json: price per million tokens in, out and cached,
context and output limits, modalities, and what each model can do.

The unit is the offering, a provider and a model together, because the
same model reaches a buyer from many providers at many prices and the
price is the question they came with.

Two rules decide what a row means, and both come from measuring the real
data. A published zero is a fact: of those 8,179 offerings, 638 cost
nothing and 424 published no price at all, so a reader that collapses the
two invents a free model or hides one. And absent is unstated, never
false, because a false travels further than a blank and comes back quoted
as a fact.

Origin is the proof, as with every catalog spec here: a file naming a
provider's web and served by somebody else is a stranger's claim about
that company's prices.

The first reader is the models collection at nichedb.dev/c/models, which
reads descriptors beside the models.dev catalogue in the same vocabulary
so one feed catches both.

Registered in the one registry, with docs/openmodel.md and a docs-only
entry (no landing page yet), and added to the spec-discovery contract so
the family page, docs index, llms feeds and sitemap are proven to carry
it.

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

apps/logicsrc-web/contract/spec-discovery.contract.test.ts

@@ -14,6 +14,7 @@ describe.each([
   { slug: "openabtest", name: "OpenABTest", family: "process" },
   { slug: "openfleet", name: "OpenFleet", family: "process" },
   { slug: "openrental", name: "OpenRental", family: "catalogs" },
+  { slug: "openmodel", name: "OpenModel", family: "catalogs" },
   { slug: "openwall", name: "OpenWall", family: "people" },
   { slug: "openobject", name: "OpenObject", family: "catalogs" },
   { slug: "openslice", name: "OpenSlice", family: "catalogs" },