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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
3,904
Categories
11
Official
102
Community
3,802
Source sites
293
Deep dives
3,904

By format

3904
  • Docs169
  • Repos & sites3095
  • Videos74
  • Posts104
  • Articles384
  • 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 3904 Jev AI model resources

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

Showing 3313–3360 of 3904 resources

This AI Can't Write a Single Word. That's the Point.
Heroic steps on typed decisions with confidence scores, parallel output speed, the Doom demo, and citations to TypeSafe, The Register, and Every.to.
Jev Media & TalksVideo#community#video#explainer
Community
jevos
1.4kGitHub stars
A local yes/no decision model that speaks Jev's wire format on a laptop CPU, refusing Choice and Score until those question types ship.
Jev Models & Reimplementations#community#python#open-models
Communityfeder-cr/jevC++
Ollaya
1.3kGitHub stars
A local daemon that pulls open decision models and serves them on TypeSafe's /v1/systemone, so a Jev client switches hosts with TYPESAFE_BASE_URL.
Jev Models & Reimplementations#community#rust#open-models
Communityollaya-dev/ollayaRust
Rizzo Flow
904GitHub stars
A local server that reads next-token probabilities from a fine-tuned Spark model and returns Choice, Score, and Noul answers with zero generated tokens.
Jev Models & Reimplementations#community#python#open-models
CommunityRizzo-AI-Academy/rizzo-flowPython
@receptron/laya
956GitHub stars
A Node and TypeScript package that runs Convai's Laya checkpoint through ONNX Runtime, with the same system_one shape as the Python reference.
Jev Repos & SDKs#community#typescript#open-models
Communityreceptron/layaTypeScript
Lichen
58GitHub stars
A local /v1/systemone server that reads label probabilities from a GGUF chat model, with prompt repetition and a confidence shrink toward uniform.
Jev Models & Reimplementations#community#python#open-models
CommunityMushroom-Systems/lichenPython
verdict
8GitHub stars
A Python server in front of llama-server that reads one-token label probabilities and exposes them as POST /v1/systemone.
Jev Models & Reimplementations#community#python#open-models
Communitykhimaros/verdictPython
Valen
861GitHub stars
A multimodal decision model that scores text, image, and video candidates with a shared head on Qwen3.5, plus SFT and experimental RLCD training code.
Jev Models & Reimplementations#community#python#open-models
CommunityLiuziyu77/ValenJupyter Notebook
jevgrep (code search)
2.8kGitHub stars
A CLI that asks Jev which files and declarations answer a repository question, then prints verbatim excerpts for a coding agent to use.
Jev Tools & CLIs#community#typescript#cli
Communitydzhng/jevgrepTypeScript
DocJev
529GitHub stars
Classifies and splits PDFs, DOCX, and PPTX with local page text from LiteParse and category decisions from Jev.
Jev Tools & CLIs#community#python#document
Communityjerryjliu/docjevPython
System One Connector
353GitHub stars
A single-binary MCP tool named evaluate that sends Noul, Choice, and Score questions to hosted Jev or a local System One server.
Jev Agents & MCP#community#go#mcp
Communityitsmostafa/system-one-connectorGo
jev-code
46GitHub stars
Five typed tools — classify, check, score, rank, and ask — plus a skill, wired into Claude Code, Codex, Pi, and OpenCode in one setup command.
Jev Agents & MCP#community#typescript#mcp
CommunityFrancoisChastel/jev-codeTypeScript
Gatekeeper
21GitHub stars
Claude Code hooks that narrow a roster in YAML, ask Jev which handler owns a prompt, and log the band before anything is blocked.
Jev Agents & MCP#community#python#coding-agent
CommunityAgriciDaniel/gatekeeperPython
Jeview
65GitHub stars
A local gateway that forwards /v1/systemone to TypeSafe, stores each call in SQLite, and draws the calls on a live map.
Jev Tools & CLIs#community#javascript#local
Communityandududu/jeviewJavaScript
jev-mail-classifier
20GitHub stars
An IMAP client that turns each inbox category into a Noul, then tags, moves, flags, or calls a webhook when the probability clears that category's threshold.
Jev Tools & CLIs#community#python#email
Communityparth-kp/jev-mail-classifierPython
jev-guard (exchange triage)
22GitHub stars
A Java gateway that asks Jev four questions about a deposit or withdrawal, then applies a direction-aware routing matrix in code.
Jev Tools & CLIs#community#java#security
Communityklauswg/jev-guardJava
jev-suite
15GitHub stars
Four Java checkers — sponsored video, hiring fit, edit fidelity, and rental listings — that keep thresholds and vetoes in unit-tested code.
Jev Tools & CLIs#community#java#verification
Communityklauswg/jev-suiteJava
clash-jev
36GitHub stars
A Clash Royale bot that turns a phone screenshot into JSON once a second and asks Jev for a strategy, a card, and a square.
Jev Demos & Experiments#community#python#gaming
Communitybytelabs-oss/clash-jevPython
Astra and JEV Minecraft agent
589GitHub stars
A Mineflayer agent for Minecraft Java 1.16.5 where a planner sets the objective and Jev picks the next bounded action from game observations.
Jev Demos & Experiments#community#javascript#gaming
Communityrmalde/minecraft-agentJavaScript
Jev on r/AmItheAsshole
3GitHub stars
A 770-post benchmark that scores Jev, Sonnet 5, GPT-5 nano, and two local models on Reddit verdicts with weighted Brier scores.
Jev Benchmarks & Evaluations#community#python#evaluation
Communitydchristopoulos/jev-aitaPython
Jev calibration study
3GitHub stars
A sentiment study of whether Jev's stated confidence matches accuracy, comparing raw scores with Platt scaling and isotonic regression.
Jev Benchmarks & Evaluations#community#python#evaluation
CommunityAnthusAI/Jev-CalibrationPython
Jev Playground
An independent browser playground that runs TypeSafe Jev on one question or several, with ready examples for routing, refunds, urgency, and the next agent action.
Jev Demos & ExperimentsPlayground#community#playground#tutorial
Community
Jev plays 2048
A live 2048 board on an independent Jev site. Each move is one Choice over the four directions, with a decision counter, latency, and a running cost.
Jev Demos & ExperimentsPlayground#community#games#playground
Community
Jev plays Tetris
A live Tetris board where each piece is one Jev Choice over the legal placements, with latency and cost shown as the pieces drop.
Jev Demos & ExperimentsPlayground#community#games#playground
Community
Jev Wikiracer
A Wikipedia race you play against Jev. From the same start article, each hop is one Choice over that page's outbound links.
Jev Demos & ExperimentsPlayground#community#games#playground
Community
Jev Calibration game
Sixteen true-or-false statements you answer, then Jev answers with a Noul probability. Keeping only its confident calls is the point of the game.
Jev Demos & ExperimentsPlayground#community#games#playground
Community
jev-mice
A browser colony of mice, cats, traps, and food. Each animal's next move is judged by Jev, or by fixed rules when the model is turned off.
Jev Demos & ExperimentsPlayground#community#games#playground
Community
Using Jev for evals in Datadog
Datadog's walkthrough of one Jev rubric that scores every criterion in a single request, then runs as online evals on live spans and as offline experiments.
Jev Guides & ArticlesArticle#community#article#evaluation
Community
Jev vs. GPT-6 Astra
Vercel's guide for when a typed Jev decision is enough and when a job still needs GPT-6 Astra to write, see images, or call tools.
Jev Guides & ArticlesArticle#community#article#routing
Community
Typed judgments or agentic loops?
Sam Reghenzi's product-taxonomy benchmark: a Jev Choice at every level versus a gpt-5.2 agent that descends the tree and can be sent back by a judge.
Jev Guides & ArticlesArticle#community#article#evaluation
Community
JEV: How It Works and What You Can Build
Riley Brown on a decision model that cannot write: a model router, Choice, Score, and Noul, then speed, cost, and where to get access.
Jev Media & TalksVideo#community#video#explainer
Community
What is Jev and How to Use it?
Codevolution's walkthrough of state, questions, and answers, then a customer-message demo in the TypeSafe playground and the TypeScript SDK.
Jev Media & TalksVideo#community#video#tutorial
Community
Jev intro and 50 use cases
Yash Thakker's intro to System One, plus 50 open-source demos that compare Jev with a regular LLM, linked from the description.
Jev Media & TalksVideo#community#video#use-cases
Community
I tried TypeSafe's System One model
Joe Maddalone on using Jev for routing and filtering before a generative model, with demo code in a transcript-analyzer repo.
Jev Media & TalksVideo#community#video#routing
Community
Jev explained, with a live demo
KodeKloud on why a System One model returns calibrated probabilities, then a Papers, Please-style queue where Jev is compared with GPT-5.5 and DeepSeek.
Jev Media & TalksVideo#community#video#explainer
Community
agent-chaperone
22GitHub stars
An MCP proxy and hooks adapter that screens an agent's tool calls before they run and the tool results before the agent reads them, with thresholds in a policy file.
Jev Agents & MCP#community#mcp#security
Communityagent-chaperone/agent-chaperoneTypeScript
OpenDecision
101GitHub stars
An Apache-2.0 decision engine with a TypeSafe-compatible endpoint, document answers with source passages, and a ViZDoom demo that picks actions from structured game state.
Jev Models & Reimplementations#community#python#local
Communitydeepanwadhwa/OpenDecisionPython
Decis
10GitHub stars
A self-hosted System One server: one /v1/systemone contract, a Docker image each for Laya and kev, and a playground where snake, dino, and tetris call that endpoint.
Jev Models & Reimplementations#community#python#local
Communitychaitin/DecisPython
Jev Plays Pokémon Red
128GitHub stars
A completed Pokémon Red run: Jev picked menus, catches, and moves from RAM, and the harness handled pathfinding. The public page records the Hall of Fame stats.
Jev Demos & Experiments#community#games#javascript
Communitychristianmat/jev-pokemonTypeScript
jevmem
128GitHub stars
Project memory for Claude Code, Cursor, and Codex. Jev decides whether a turn is a decision, rule, bug, or injection, and code writes or supersedes a line in JEVMEM.md.
Jev Agents & MCP#community#coding-agent#memory
CommunityAvinash-jetwani/jevmemTypeScript
mini-Jev
59GitHub stars
A preregistered measurement of a Jev-style interface on frozen Qwen3-4B: read the option letter's logits instead of generating grammar-constrained JSON.
Jev Models & Reimplementations#community#python#local
Communityr-ms/mini-jevPython
AILIKE for MySQL
4GitHub stars
A MySQL plugin that filters rows with a natural-language condition. AILIKE asks Jev whether a column value matches, and returns 1, 0, or NULL.
Jev Integrations & Adapters#community#sql#database
Communitymaayanlevy/mysql-ailikeC++
Jev introduces a new shape of LLM
Simon Willison's overview of System One: one state, many parallel questions, and Noul, Choice, and Score instead of generated text.
Jev Guides & ArticlesArticle#community#article#explainer
Community
Jev can't be calibrated
Alex Molas argues that a probability fit on TypeSafe's data is not calibrated on yours, so Jev's numbers should be treated as scores.
Jev Guides & ArticlesArticle#community#article#calibration
Community
A Jev-like wrapper for LLMs
Allan Riordan Boll reads one-token logprobs so a chat model returns a letter and a distribution, including on webcam frames from a vision model.
Jev Guides & ArticlesArticle#community#article#open-models
Community
GLM-5.3-Flash as a decision model
Privatemode's write-up of typed decisions from GLM-5.3-Flash in one forward pass, with latency, cost, and accuracy set next to Jev and Laya.
Jev Guides & ArticlesArticle#community#article#evaluation
Community
Detecting compromised coding agents with Jev
Kunal Singh records coding-agent actions with Gryph and asks Jev yes-or-no questions against a short profile of how that developer usually works.
Jev Guides & ArticlesArticle#community#article#security
Community
Seven practical Jev use cases
Vercel's guide for seven jobs Jev can take: routing forms, prioritizing tickets, reviewing tool calls, picking a model, categorizing documents, moderation, and checking an answer.
Jev Guides & ArticlesArticle#community#article#routing
Community

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 3904 entries from 293 source sites, last updated Nov 5, 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. 3904 of the 3904 entries carry one today.

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