Measured on sample data · graded by code, not vibes

526 use cases that already work. Find yours below.

Every one is a working kit, not a claim: the sample data on the page, the framework laid out end to end, the cost of running it, by model, and the failure modes that made us change the code. Pick the one shaped like your problem and build from it.

Today in AI25 Sep, 08:56 CDTFull brief →
Live · from this morning’s brief
The use cases

526 kits you can read end to end

Each one is a real build with its numbers attached: what it gets right, what it gets wrong, what it costs per call, and the evals that prove both. The list is open to everyone; opening a kit asks you to sign in first. The free floor is pure code over checked-in files, so every score on these pages was produced without a key.

Every vertical, and how many kits are in it

33 verticals · pick one to open the catalogue filtered to it
What they reduce to — 14 shapes across all 526
Start from the problem

What are you trying to do?

Already know which kit you want? Use the filter above. This is the other way in: you do not need to know what the technique is called — start typing what is going wrong, and it answers from 21 problems mapped to 120 pages.

⌘K
The map

How a modern AI system fits together

One request in flight, and the five layers underneath it. Each layer is a group in the menu, and every page in it is a deep dive.

How the system runs · two lanes, not one — most of what decides the answer happens in the top one, before anybody asks anything
Indexingonce per document — where quality is decided
SourcesIngest & cleanChunkEmbedVector store
Queryevery request — where the latency is
User queryOrchestrationRetrieve context · RAGLLM + contextGuardrailsGrounded answer
The five layers underneath it · read bottom-up — each builds on the one below, and each is a group in the menu. Every page in them is listed below.
5
Operate
Measuring it, guarding it, serving it, and knowing what it costs
4
Build
Frameworks, agents, skills and the data work underneath them
3
Ground
Prompting, retrieval, and deciding what fills the context window
2
Models
Which model you call, how you search meaning, when to retrain
1
Foundations
Statistics, machine learning, and the transformer underneath it all

One of the six groups is not a layer of the stack and sits alongside it. Reference is what you consult — the tables, dashboards and one-pagers you look something up in rather than read through.

What’s in here

960 pages, and how current each one is

The menu tells you what the subjects are. This is how much is behind them, and when it was last checked.

Checked

Newest use caseFRESH2026-09-24UC0526 — Order emails to checked purchase orders. Every kit carries the date its run was measured.
Agent Skills availabilityAGEING2026-09-1235 entries, re-read against primary sources rather than polled — nothing here refreshes itself, so it ages until somebody reads it again
Model pricingAGEING2026-09-05oldest of 19 rows, every one verified
Pricing sources re-readFRESH2026-09-258 of 8 cited pages unchanged since the last read
Page countsFRESH2026-09-25every figure on the left re-derived and matched against the page it opens — a gate, and it needs no network
Today in AIFRESH2026-09-25regenerated every morning
A living map of modern AI — kept current every morning