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The full directory

All Jev AI model resources

Entries for TypeSafe AI's flagship System One model — official docs and SDKs alongside community clients, tools, and write-ups.

Entries
3,919
Categories
11
Official
102
Community
3,817
Source sites
293
Deep dives
3,919

By format

3919
  • Docs169
  • Repos & sites3102
  • Videos74
  • Posts104
  • Articles392
  • Playgrounds78

Updated

Browse the Jev AI model by category

11 ways into the ecosystem. Each category page leads with its own shortlist of starting points.

Browse the Jev AI model by use case or industry

The same directory, sliced by what you are building and who you are building it for.

Jev use cases13 ways to put Jev to work, from classification and routing to decision gating and evaluation.
Jev industries14 sectors building with Jev, from software and security to healthcare and robotics.

All 3919 Jev AI model resources

Search the full directory, or filter by category and tag.

Showing 2017–2064 of 3919 resources

System One models for prod, not god
swyx's Latent Space interview with Diogo Almeida, posted on Hacker News as the first long technical conversation with TypeSafe's CEO.
Jev Guides & ArticlesArticle#community#article#explainer
Community
Knowledge Signal
0GitHub stars
A Show HN prototype that turns study notes into a confidence-aware knowledge profile by scoring them with Jev.
Jev Tools & CLIs#community#evaluation
Communitysumant1122/knowledge-signalJavaScript
CUA-S1 on Hacker News
The Show HN for CUA-S1, where Cua's founders ask how many computer-use steps actually need a general-purpose model.
Jev Guides & ArticlesPost#community#computer-use#agents
Community
Von on Hacker News
The Hacker News post for Von, the local non-autoregressive model offered as a drop-in alternative to hosted Jev.
Jev Guides & ArticlesPost#community#open-models
Community
Ask HN: what is Noul
A short Ask HN on Noul: a yes-or-not probability, sitting next to Choice and Score, and not a boolean.
Jev Guides & ArticlesPost#community#primitives
Community
LocalLLaMA: Jev as a classifier
The r/LocalLLaMA thread arguing that Jev's constrained probabilities are ordinary zero-shot classification, and that the comparison should be other classifiers.
Jev Guides & ArticlesPost#community#open-models#evaluation
Community
LocalLLaMA asks mods to curb Jev ads
An r/LocalLLaMA post asking moderators to deal with a flood of Jev advertising, and accusing the launch of being paid promotion.
Jev Guides & ArticlesPost#community#launch
Community
InfoQ: Jev returns typed probabilities
InfoQ's 1 October 2026 news brief on Jev: a parallel pass over typed questions, TypeSafe's published price and latency, and where to read the jaggedness notes.
Jev Guides & ArticlesArticle#community#article#explainer
Community
TechCrunch on the model that does not write
Tim Fernholz's 18 September 2026 TechCrunch piece on Jev: no text output, synthetic-data training, and a launch that briefly outran the API.
Jev Media & TalksArticle#community#article#launch
Community
Real Python: Jev in Python
Philipp Acsany's tutorial replaces a Y-or-N input check with Jev, then asks Noul, Score, and Choice in one call through OpenRouter.
Jev Guides & ArticlesArticle#community#article#tutorial
Community
DataCamp: a typed ticket router
Tom Farnschläder's 24 September 2026 tutorial builds a support-ticket router with the Python SDK, using Choice, Score, and Noul in one call.
Jev Guides & ArticlesArticle#community#article#tutorial
Community
OpenRouter: what Jev returns
Kenny Rogers explains Jev as a decision model and shows Choice, Score, and Noul responses from calls he placed through OpenRouter on 21 September 2026.
Jev Guides & ArticlesArticle#community#article#explainer
Community
OpenRouter: point the TypeSafe SDK here
OpenRouter's guide for calling Jev with the official JavaScript or Python SDK by changing the base URL and using an OpenRouter key.
Jev Integrations & AdaptersDocs#community#docs#sdk
Community
Vercel: Jev for Python engineers
Yury Selivanov's 2 October 2026 post on the Python AI SDK: experimental evaluate() calls typesafe-ai/jev through an AI Gateway key.
Jev Guides & ArticlesArticle#community#article#tutorial
Community
Databricks: ai_decide
Databricks' 30 September 2026 announcement of ai_decide, a beta SQL and REST function for typed decisions, described as compatible with the TypeSafe API.
Jev Integrations & AdaptersArticle#community#article#databricks
Community
Databricks: query a System One model
Databricks docs for the System One route on Unity Gateway. The example model is system.ai.openjev-qwen35-4b, with noul, choice, and score questions.
Jev Integrations & AdaptersDocs#community#docs#databricks
Community
IBM Mixture of Experts on Jev
IBM's 25 September 2026 Mixture of Experts episode spends a segment on Jev, setting TypeSafe's speed and cost claims against how the company built its benchmarks.
Jev Media & TalksArticle#community#podcast#ibm
Community
Together: train your own Jev for $17
Together AI's tutorial for fine-tuning a Jev-like classifier, Tev1, on Qwen3.5 4B and serving it on Together. The example uses 38,340 rows.
Jev Models & ReimplementationsArticle#community#article#tutorial
Community
system-one-foundation-models
118GitHub stars
Native Swift 6 package that evaluates @Generable structs and enums through System One decision models in 15-150 ms, with on-device Laya, self-hosted laya-serve, and TypeSafe Jev cloud backends.
Jev Models & Reimplementations#community#github
Communitypeterfriese/system-one-foundation-modelsSwift
BrighTO_Router
21GitHub stars
Self-hosted Rust LLM gateway and load balancer with a System One decision route: one endpoint for OpenAI, Anthropic, local, and Jev-compatible backends, with Model Groups, team budgets, and Postgres usage records.
Jev Integrations & Adapters#community#github
Communitythusinh1969/BrighTO_RouterRust
jev
15GitHub stars
Go Unix CLI that pipes state on stdin into one Jev question — noul, choice, or score — across TypeSafe, Cloudflare, and Vercel providers, printing machine-readable JSON and signaling success by exit code.
Jev Repos & SDKs#community#github
Communitystefafafan/jevGo
jev-reranking
10GitHub stars
Reproducible study testing whether Jev zero-shot can match specialist rerankers on fixed MS MARCO passage, MS MARCO document, and TREC-1 WSJ candidates, reporting ranking quality, time, and API cost.
Jev Agents & MCP#community#github
Communitycarlaiau/jev-rerankingPython
brier
8GitHub stars
Open local decision model on Qwen3-4B with LoRA adapters that answers choice, score, and noul questions with probabilities, calibrated confidence, and conformal sets, offline with no per-call cost.
Jev Tools & CLIs#community#github
CommunityMangaba-ai/brierPython
jev-router
17GitHub stars
Local pass-through proxy that asks Jev which tier each human turn needs — fast, balanced, frontier, or max — then forwards Claude Code and Codex CLI traffic to that model while streaming responses back unchanged.
Jev Agents & MCP#community#github
Communitydirien/jev-routerJavaScript
SwiftJev
9GitHub stars
Swift provider adapter that sends typed noul, choice, and score prompts to the hosted System One API through SwiftDecision DecisionBackend, returning validated probability distributions.
Jev Tools & CLIs#community#github
CommunitySoundBlaster/SwiftJevSwift
jev-in-the-wild
8GitHub stars
Community index of Jev use cases, open-source projects, benchmarks and criticism, built from a JSON dataset spanning GitHub, Reddit, YouTube and blogs, with a section for failures.
Jev Guides & Articles#community#github
CommunityJessie-QingYu/jev-in-the-wildJavaScript
typesafe-client
7GitHub stars
Unofficial Go and Rust clients for the System One API covering noul, choice and score questions, with env-based config, retries, typed errors and gateway support.
Jev Repos & SDKs#community#github
Communityhaileyok/typesafe-clientRust
gut
7GitHub stars
Python helper that turns judgment calls into one-liners like likely, classify and rate, defaulting to Jev while also running on local or OpenAI-compatible backends.
Jev Models & Reimplementations#community#github
CommunityKungie/gutPython
kev-onnx
9GitHub stars
Self-hosted CPU-only server that speaks the /v1/systemone wire format for the KEV decision model, packaged as one container with ONNX Runtime and a health check.
Jev Models & Reimplementations#community#github
Communityaleskxyz/kev-onnxPython
TypeSafeJevPlayground
9GitHub stars
Unofficial .NET port of the JavaScript SDK covering SystemOne noul, choice and score questions with env-based config, retries and typed errors.
Jev Demos & Experiments#community#github
Communitylaurentkempe/TypeSafeJevPlaygroundC#
laya-jev-compatible-server
6GitHub stars
Laya multilingual server exposing POST /v1/systemone and GET /v1/models for noul, choice and score questions, usable with the official TypeSafe SDK.
Jev Models & Reimplementations#community#github
Communityexfly/laya-jev-compatible-serverPython
wald-4b
6GitHub stars
Open-weight 4B decision model on Qwen3.5-4B-Base serving a Jev-compatible /v1/systemone API, returning per-option probabilities with adjustable thinking.
Jev Agents & MCP#community#github
Communityorg2AI/wald-4bPython
klint
5GitHub stars
Python CLI that audits files and package trees against plain-English JSON rule packs in one System One forward pass, locally with kev or remotely with Jev.
Jev Models & Reimplementations#community#github
Communityskydiving94/klintPython
HA-SystemOne
6GitHub stars
Home Assistant integration exposing decision-model APIs through a native AI Task entity, typed jev actions, YAML decision sensors and an Assist router.
Jev Integrations & Adapters#community#github
CommunityAtHeartEngineer/HA-SystemOnePython
jev-ai-use-cases
5GitHub stars
LangChain notebook with runnable Jev examples for ticket triage, model routing, reply guardrails, tool selection and finance inbox checks.
Jev Integrations & Adapters#community#github
Communityatliq/jev-ai-use-casesJupyter Notebook
opencode-auto-jev
6GitHub stars
OpenCode plugin adding an Auto virtual model that asks Jev to pick one of your connected models per turn, failing closed to a fallback when unsure.
Jev Integrations & Adapters#community#github
Communityjorgefspereira/opencode-auto-jevTypeScript
paper-radar-jev
3GitHub stars
Python CLI that pulls recent arXiv papers, scores relevance with TypeSafe and writes daily Markdown and JSON rankings with resume-safe storage.
Jev Tools & CLIs#community#github
CommunityLYchoon/paper-radar-jevPython
ex_typesafe_ai
3GitHub stars
Idiomatic unofficial Elixir client for the TypeSafe AI API, installed from Hex with typed noul, choice, and score question builders plus supervision-tree support.
Jev Repos & SDKs#community#github
Communityiamtalha-arshad/ex_typesafe_aiElixir
anarkali
4GitHub stars
Compact open-weight typed-decision model with a local 150M ONNX release for CPU inference, speaking the Jev and Laya /v1/systemone request shape.
Jev Agents & MCP#community#github
CommunityToufiqQureshi/anarkaliPython
taurus-jev-sdk-go
3GitHub stars
Zero-dependency Go client for the TypeSafe System One API with typed noul, choice, and score questions, strict response validation, and safe concurrent use.
Jev Repos & SDKs#community#github
CommunityKKloudTarus/taurus-jev-sdk-goGo
tev1-50-use-cases
6GitHub stars
Fifty runnable tev1 decision-model examples through local Ollama, from ticket triage and guardrails to six playable games, with a live request viewer and scoreboard.
Jev Demos & Experiments#community#github
CommunityPromptEngineer48/tev1-50-use-casesPython
jev-tmmluplus-eval
3GitHub stars
Harness that sits Jev for the 66-subject Traditional Chinese TMMLU+ suite, asking every item as one four-way A/B/C/D choice with calibration reporting.
Jev Tools & CLIs#community#github
Communitylianghsun/jev-tmmluplus-evalPython
rwkv-jev
4GitHub stars
RWKV-7 decision-model server exposing a Jev-compatible /v1/systemone endpoint, with constrained decoding over answer tokens and zero output tokens.
Jev Tools & CLIs#community#github
CommunityXingQiPan/rwkv-jevPython
laya-system-one
4GitHub stars
Zero-dependency Node package wrapping the Laya decision model for offline typed answers, usable as a CLI service, in-process library, or browser build.
Jev Models & Reimplementations#community#github
Communityitaloalmeida0/laya-system-oneJavaScript
jevselector
3GitHub stars
OpenCode v2 plugin that asks Jev each turn which skills and tools matter for the request, then trims the advertised set for that request only.
Jev Agents & MCP#community#github
Communityuniversam1/jevselectorTypeScript
jev-qa-demos
3GitHub stars
Video companion code showing Jev for QA work through the Vercel AI Gateway, from CI failure triage to guardrails, grounding checks, and local Ollama runs.
Jev Integrations & Adapters#community#github
Communitygauravkhuraana/jev-qa-demosTypeScript
ai-chess-lab
4GitHub stars
Browser chess lab where LLMs, System One models, and humans play single games, Swiss tournaments, and leagues with Stockfish analysis and cost tracking.
Jev Integrations & Adapters#community#github
Communitydperezcabrera/ai-chess-labPython
jev-evals
3GitHub stars
Rubric-based eval harness that judges LLM and agent outputs with Jev through the Vercel AI Gateway, answering all rubrics for a case in one round trip.
Jev Benchmarks & Evaluations#community#github
CommunityNicolasMontone/jev-evalsTypeScript

Start here with the Jev AI model

Hand-picked entries the maintainers recommend first, from official primitives to community tools.

Jev: For the Builders AND Dreamers (Jev 1.14)
The Jev Day release post: Jev 1.14.0 under jev-preview plus three danger-zone features — composable images on both models, the box question type on 1.14 only, and opt-in 262k context.
Jev Guides & ArticlesArticle#official#release#vision
Official
Box Questions (Dreamer-Ready)
The box question type: one bounding box per question, returned as four edges that are fractions of the image, plus confidence, with no criteria field and no not-found value.
Jev Practices & PatternsDocs#official#docs#vision
Official
Jev 1.14 Day 0 Support in LiteLLM
LiteLLM's Day 0 post for TypeSafe Jev 1.14: the proxy adds box questions, image input and long-context mode on both POST /v1/systemone and POST /v1/decisions, forwarding TypeSafe-Danger-Zone headers only to TypeSafe deployments.
Jev Integrations & AdaptersArticle#community#litellm#gateway
Community

Newest Jev AI model resources

The latest additions to the directory, newest first.

From the Jev community

Watch walkthroughs, read the threads, and see what builders are posting.

YouTube: KodeKloud's three-minute primer: what a System One model decides, and why it answers in milliseconds.

YouTube: Caleb Writes Code explains what Jev is and how to call it, in seven minutes.

YouTube: Greg Isenberg and Ryan Vogel on the businesses Jev unlocks, and a path in through the Vercel AI Gateway.

YouTube: CJ from Syntax demos browser use, classification, code review, a model router, and a chat bot with no LLM.

YouTube: Ryan Vogel runs Jev on 100 and then 1,000 emails: category, priority, spam, and reply predictions.

YouTube: AICodeKing tests support routing, refund detection, prompt-injection resistance, and browser automation.

Hacker News: Show HN: Ad Spend Guard gates budget before the auction, not the creative after.

Show HN: Gating ad budget with a decision modelRead the thread on Hacker News

Reddit: Reranking rebooking options with a decision model, ranked with reasons.

Hacker News: Pick Verify: a single decision at the warehouse pick station catches confusable picks.

Show HN: Verifying robot picks with a decision modelRead the thread on Hacker News

Hacker News: Decision Index 0.2.1 scores open reproductions of Jev on a frozen suite.

jackbravo4 pointsDecision Index 0.2.1 – 70 open reproductions of TypeSafe Jev's Decision ModelRead the thread on Hacker News

Hacker News: Software Bombe and live Enigma demo where Jev ranks cribs and judges plaintext.

ag_212 pointsShow HN: Jev as the Bletchley Park Analyst: A Software Bombe on EnigmaRead the thread on Hacker News

Hacker News: Show HN for the decide CLI: brew install, file context, and multi-question shell scripts.

vsekhar2 pointsShow HN: Decide – Jev decisions in the shell, scripts, and agent skillsRead the thread on Hacker News

Follow @typesafeai

How entries are chosen

Every entry is reviewed against the same bar, whether it comes from TypeSafe or the community.

  • Public and working — no paywalls, sign-up walls, or dead links.
  • Concrete — it has to be about Jev and the System One API, not generic LLM content.
  • Useful today — something a developer can learn from or use right now.
  • Distinct — if a similar entry exists, the description has to say what makes this one different: a different runtime, a cheaper path, a measured result, or a narrower focus.
  • Documented — repos state their license, and docs are in English or carry an English summary.

Spam, affiliate links, and thin AI-generated content are rejected. New entries are expected to ship with a deep dive: two to five highlights, caveats, a quickstart snippet where one helps, and a verification date. Star counts are refreshed when an entry is touched.

Common questions

Short answers about Jev and how this directory works.

What is the Jev AI model?

Jev is TypeSafe AI's first System One model — an AI model that takes a state plus typed questions and returns one structured answer per question: a choice, an ordered score, or the probability of yes, with calibrated confidence on Choice and Score answers. Code can branch on the result without parsing generated text.

What is the difference between Choice, Score, and Noul?

They are the three question primitives. Choice picks one of up to 255 options, Score rates on 2 to 10 ordered levels, and Noul answers yes or no. Choice and Score answers carry a confidence between 0 and 1; a Noul answer is the probability of yes.

Which Jev SDKs and client libraries are available?

TypeSafe maintains official JavaScript/TypeScript and Python SDKs plus a Python adapter. The community has built clients for Go, .NET, PHP, Laravel, Rust, Elixir, Ruby, and Scala, along with framework integrations such as DSPy, LlamaIndex, and Home Assistant. All of them are listed in the Repos & SDKs category.

Is the directory free, and is it affiliated with TypeSafe AI?

The directory is free to browse: every entry is reviewed, and spam, affiliate links, and sign-up walls are rejected. JevDirectory.org is community-run and not affiliated with TypeSafe AI — Jev and System One are TypeSafe AI trademarks.

How often is the directory updated?

Entries are added as new resources appear and re-checked when they are touched. The directory currently holds 3919 entries from 293 source sites, last updated Nov 6, 2026.

What is a verified deep dive?

Most entries include a deep dive: two to five highlight bullets someone would only know from using the resource, a caveats note about limits and requirements, an optional quickstart snippet, and the date the link was last checked. 3919 of the 3919 entries carry one today.

For the canonical details, read the official TypeSafe docs and the API reference.