Official TypeSafe
Launch post, manifesto, docs, evals, jaggedness, Discord AMAs. Still the primary fact source for this 101.
Harvest log · 2026-09-20e
What we found this pass
jev.page is supposed to be the beginner map of everything public about Jev — without inventing customers, logos, or numbers. This page is the audit trail for the latest sweep.
Ran . Method: Official SDK pages (Python grouped nouls/choices/scores; JS choice() helper). X search from:typesafeai since 2026-09-20T02:00Z still 0 posts. Public web: AIMLAPI model card, Refix tutorials, MrJev. Product Hunt, Reddit, Facebook — no TypeSafe Jev corpus this pass.
Channels we actually checked
X / @typesafeai + community
40 official posts since Sep 15 via `from:typesafeai`. Community builds are labeled PRESS: builder claims, not TypeSafe metrics.
Public web / docs / blogs
LangChain, Langfuse, Vercel, Cloudflare, AY Automate, Volanea, Awesome Jev, Flavio Copes, jevaiguide.com, jevtypesafeai.com. Third-party essays stay PRESS/EDU.
Searches for TypeSafe AI / Jev / System One and site:reddit.com returned no durable Jev thread this harvest. Earlier hits were unrelated Unity TypeSafe / Verve OS.
No public Facebook post, group, or Page about TypeSafe Jev surfaced. Meta AI “System Cards” research is a name collision, not this product.
Hacker News
Launch thread plus a naming thread and an OpenJev “What’s a Jev?” thread. Comments are not TypeSafe docs. Employee comment on one thread is labeled as such.
Product Hunt
No TypeSafe Jev listing surfaced this pass. Do not invent a launch post.
Findings worth teaching
Sep 17, 2026 · Web · platform · Third-party
Jev on AI/ML API
Platform card: model typesafe/jev, POST /v1/decisions, $0.0577668 / 1M input, 32K context. Not TypeSafe list price ($0.042) or official 64k. Their FAQ correctly notes vendor latency/multiples are unverified.
Sep 18, 2026 · Web · third-party · Teaching map
Refix Python + TypeScript tutorials
Neil Agarwal’s language-split 101s: sync vs async Python, inferred TS answer types, keep side effects in code. Teaching pages, not TypeSafe.
Sep 20, 2026 · Web · third-party · Teaching map
MrJev getting-started
Another independent first-call page (Playground, both SDKs, pin jev-1.13.0). Map it; prefer official docs on conflict.
Sep 20, 2026 · Product Hunt · Documented gap
No Product Hunt listing this pass
site:producthunt.com TypeSafe Jev returned nothing we can quote. Do not invent a launch-day PH post.
Sep 20, 2026 · Hacker News · Third-party
HN: Introducing System One Models and Jev
Public thread on the launch post. Commenters debate “can’t hallucinate” vs wrong decisions, branding collisions (old Typesafe / Akka), and Kahneman naming. One reply links a community chess demo. Not a TypeSafe FAQ.
Sep 20, 2026 · Hacker News · Third-party
HN: The Model That Gives AI the Properties of Code
Short thread on Almeida’s X post. A commenter identifying as a TypeSafe employee: Jev is not a reasoning model and has no hidden thinking tokens — design reasoning in code. Access question left unanswered in-thread.
Sep 20, 2026 · Hacker News · Third-party
HN: What’s a “Jev”? (on OpenJev)
Commenters argue whether Jev is “LLM-based.” Official FAQ line quoted in-thread: “neither small nor an LLM.” Others say transformer + text in / JSON out still counts. This 101 keeps TypeSafe’s wording and does not settle the architecture rumor.
Sep 20, 2026 · Web · community · Third-party
jev-chess (HN comment)
qibinlou: play White against Jev as Black. Legal moves fed to Vercel experimental_evaluate(); Jev picks among server-validated candidates. Author: ~300 ms, ~$0.00004/move. One demo, not a TypeSafe bench.
Sep 17, 2026 · Web · press · Third-party
InfoWorld: models that work with machines
Anirban Ghoshal restates TypeSafe’s launch: Jev returns a defined decision plus probability for software, 70–500 ms, $0.042 / MTok input, output “too cheap to meter.” Secondary press — not a TypeSafe table.
Sep 20, 2026 · Web · third-party · Teaching map
DEV.to practical guide (Valyu)
Independent 101: primitives, five patterns, jaggedness, and a labeled first-48-hours survey (1kpapers, jev-ultrafast, computer-use, jev-trader, jev-drone). Author figures stay with the builders.
Sep 20, 2026 · Web · platform · Third-party
Vercel AI Gateway model card
Gateway lists typesafe-ai/jev, $0.042/1M input, max output tokens 0, experimental_evaluate. Example uses type: boolean for a Noul-shaped question — platform field name, not TypeSafe’s noul.
Sep 20, 2026 · X · official · Official / first-party
No new @typesafeai posts after FREE
search_posts_all from:typesafeai since 2026-09-20T02:00Z returned 0 results. Latest official post this 101 already has: “FREE” (Vercel Gateway promo until Sep 25).
Sep 17, 2026 · Web · third-party · Teaching map
Flavio Copes deep dive
Independent long-form 101: primitives, state, confidence, Vercel SDK, jaggedness, and a labeled early-demo survey. Author says he has console access but has not put Jev in production. Teaching essay, not TypeSafe.
Sep 19, 2026 · Web · third-party · Third-party
jevaiguide.com live API notes
Third-party page that says it checked live calls on Sep 19: pin jev-1.13.0; jev-1.13 (no patch) returned HTTP 400; GET /v1/models listed aliases only; 20 Nouls in one call ~332 ms. Their test log, not a TypeSafe table.
Sep 20, 2026 · Web · third-party · Teaching map
jevtypesafeai.com how-to-use
Another independent first-call page (curl + three primitives). Overlaps official quickstart. Keep as a map of competing 101s, not a fact source.
Sep 18, 2026 · X · official · Official / first-party
Jev on OpenRouter (beta)
@typesafeai posted “@OpenRouter 🤝 @typesafeai.” OpenRouter’s matching post: Jev takes app state plus a typed question and returns a typed decision with a probability — no JSON prompting layer.
Sep 17, 2026 · X · official + docs · Official / first-party
Jev on Cloudflare Workers AI
Official handshake plus Cloudflare docs for model `typesafe/jev`. Documented examples: support department routing, structured refund review, account risk + escalation.
Sep 17, 2026 · X · official + changelog · Official / first-party
Jev on Vercel AI Gateway
Official: “Jev is now available on the @vercel AI Gateway.” Vercel changelog: AI SDK 7 `evaluate` API, model `typesafe-ai/jev`. Vercel Developers later said Gateway access is free until Sep 25 — a platform promo, not TypeSafe’s default price.
Sep 18, 2026 · X · quoted by official · Official / first-party
Venice API beta
Venice: “It answers, it doesn’t write.” Official quote-tweet: “It's Jev, not Jev.” Platform path — not a TypeSafe default.
Sep 17, 2026 · Web · LangChain · Third-party
Building a harness with Jev
LangChain ships `langchain-typesafe` / `TypeSafeClassifier`. Named patterns: ModelRouterMiddleware (cheap vs capable model) and AutoModeMiddleware (tool-call risk gate). Mentions Browserbase browser-use, a live trading agent, and email triage — those names are LangChain’s report of community projects.
Sep 18, 2026 · Web · Langfuse · Third-party
Using TypeSafe’s Jev for evals
Langfuse: Jev is a good fit for repeated, high-volume judgments with a known answer set — agent/tool routing, ticket class, escalation, eval scoring. Documents that Noul has no separate confidence field. Relays Good Start Labs: 6,003 rubric checks, 91.5% agreement with Claude Fable 5.1 — a third-party bench, not a TypeSafe table.
Sep 19, 2026 · Web · third-party · Teaching map
AY Automate use-case map
Adel Dahani maps official buckets into seven patterns (route, guardrail, rerank, score, map-reduce, CI lint, real-time). Honest about vendor numbers. AY Automate says they have not used Jev on client work — teaching map, not a case study.
Sep 16, 2026 · X · quoted by official · Third-party
Vercel fx command reviewer
Guillermo Rauch: fx default mode uses a safety reviewer on every command; GPT Luna today, Jev “up to 18x faster (p95) and more accurate,” coming to AI Gateway. One company’s report of one classifier.
Sep 16, 2026 · X · quoted by official · Third-party
Vercel classifier eval
Malte Ubl: Jev vs an existing Gemini 2.5 Flash Lite classifier — “won both on quality (saturated the eval) and speed (6x).” Official quote-tweet: “Look at Jev hitting 100% accuracy for @vercel.” Saturation of one internal eval, not a public bench.
Sep 16, 2026 · X · community · Third-party
Computer-use / browser-use loops
aaron (@awlevin) posted a computer-use demo “155x cheaper than opus 5, ~20x faster.” dax quoted browser-use + OpenCode. LangChain separately named Kyle Jeong / Browserbase. Builder claims; keep them off TypeSafe’s scoreboard.
Sep 17, 2026 · Web · index · Third-party
Awesome Jev catalog
Community index (awesomejev.com) listed hundreds of repos and sites on 2026-09-17: official SDKs, language clients, MCP servers, routers, games, Home Assistant, n8n. Useful map; star counts and project claims are the index author’s, refreshed by them.
Sep 20, 2026 · Reddit · Documented gap
No durable Reddit Jev thread this pass
site:reddit.com searches for TypeSafe AI, Jev, System One, and typesafeai returned nothing we can quote. Do not invent a r/MachineLearning thread.
Sep 20, 2026 · Facebook · Documented gap
No public Facebook Jev corpus
Facebook/Meta search hits were unrelated ML “System Cards” research. TypeSafe’s public social surface this week is X + Discord + LinkedIn company page.
What this changes on the 101
- Official X now includes OpenRouter, Cloudflare, the TechCrunch thank-you, Allie’s Discord, and the waitlist/hiring posts — quoted on Social.
- Community and platform use cases live on Ecosystem, labeled PRESS. The use-case lesson stays official-theme first.
- First-call now lists OpenRouter, Cloudflare, and Vercel Gateway as platform paths next to the official waitlist.
- Reddit and Facebook are recorded as gaps, not as empty invent-a-thread pages.