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What it’s for: Compare September’s six model releases on price, context and our own runs of the same three workloads, then pick one for your feature in twenty minutes.
Model Release Digest, September 2026
Contents
28 pages, PDF and EPUB, plus the Jupyter notebooks
Earlier versions sell at their own price.
Model Release Digest, September 2026
September 2026 · Use license
What it is, how it was made, and what you need to run it.
The exact contents you receive. Each file is listed with its size and fingerprint, so you can check that your copy is complete.
Text files and datasets in your copy carry your order’s marks, so their fingerprints differ from those shown here; your copy’s license file lists its exact fingerprints. Images, video and other binary files arrive unchanged.
For the Use license you have selected.
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Ask @june.writes anything about this work. Answers are public.
Dana W. · 8d
Will October get its own edition?
June ParkCreator · 7d
Yes. Digest Desk compiles one every month, and each edition goes through review before it is listed.
1,400 trajectories, nine harnesses, one uncomfortable finding: task success hides most failures.
Research · Project
We ran 1,400 agent trajectories across nine public harnesses and found that task success alone hides most failures. This report proposes a four-layer rubric.
What it’s for: Help a team choose how to evaluate its agents, with methods compared on real tasks.
v2.0 turns the template into a kit: an eval plan, a failure taxonomy and a cost model that sets a per-request ceiling at today’s model prices.
Document template · Module
A product requirements template with sections most teams forget: failure taxonomy, human review thresholds, latency budget and per-request cost ceiling.
What it’s for: Spec an AI feature before you build it: a PRD template, an eval plan, a failure taxonomy and a cost model with per-request ceilings.
The 2026.2 edition updates the vendor BAA table and adds a chapter on prompt logs.
Guide · Project
Which vendors sign a BAA, where PHI leaks in prompt logs, and the eleven controls auditors ask about first. Written with two compliance officers.
What it’s for: A practical guide for US health-tech teams whose AI features have to pass a HIPAA audit.
v1.0 builds on the Agentic Commerce Protocol instead of competing with it: allow-lists, consent tokens and disputes, plus a reference server and a conformance suite.
Spec · Module
Maps each protocol endpoint to the controls a store still has to build, then ships them: an OpenAPI file, a TypeScript reference server and a conformance suite you run against your own implementation.
What it’s for: Implement agent checkout on top of the open Agentic Commerce Protocol, with the parts it leaves to you: spending caps, consent tokens, agent allow-lists and dispute flows.
v2.0 is out. Rebuilt the forecasting views with Claude Opus 5.5 and then spent a week on the empty states nobody screenshots.
Project kit · Project
What it’s for: Launch a polished SaaS billing dashboard in an afternoon instead of a sprint.
Fourteen pages, two languages, light and dark, and a Lighthouse score of 95 or better on every one. Northwind is the marketing site I kept rebuilding for clients, finished once.
Page or landing · Project
What it’s for: A finished marketing site for a SaaS product: fourteen pages in English and Spanish, light and dark, ready to rename and deploy.
Most startup ledgers I have audited were a balance column and good intentions. Tally is the boring version: double-entry journals, idempotent writes and 420 tests that prove every journal balances.
Backend or API · System
What it’s for: A small, correct ledger service for apps that move money: double-entry journals, idempotent writes and balances you can trust at any point in time.
Early access: webhook verification for 14 providers, plus a replay console that has already saved me twice.
Backend or API · System
What it’s for: Receive, verify, retry and replay webhooks from any provider with one small service.