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XML version of this sitemapLast updated: 18 Sep 2026
Main pages
Models
Guides
- What is a System One model?
- Jev explained: TypeSafe AI's decision model
- System One models vs LLMs
- Choice, Score and Noul: the three primitives
- How to build with System One models
- RLCD explained: training a model to be calibrated
- Is Jev just a zero-shot classifier?
- Jev speed and pricing
- How to get Jev API access
- Jev architecture: what is known and what is not
Use cases
Workflow control
All 4Retrieval and knowledge
All 4Safety and quality
All 4Data and operations
All 4Recipes
- Ask four questions in one call and route in code
- Check a citation against its source with a noul
- Gate a destructive action on confidence
- Re-rank retrieved passages with a Score rubric
- Route a support ticket with one Choice
- Score a sales lead on four dimensions and weight them yourself
- Screen a message for prompt injection with Nouls
- Walk a taxonomy with one choice per level
Glossary
- Calibrated Probability
- Calibration
- Choice
- Composite scoring
- Confidence
- Confidence Gating
- Decision Model
- Expected calibration error
- Hallucination
- Intent routing
- Jaggedness
- Jev
- Non-autoregressive
- Noul
- Question
- RLCD
- Score
- Speculative fan-out
- State
- Structured outputs
- System One Model
- System Two Model
- Thinking, Fast and Slow
- Typed output
- TypeSafe AI
- Zero-shot classifier
Examples
Projects
View all 87 projects- ably-labs/jev-pong
- agent-labs-dev/fastbrowse
- AI Elo Ranker
- anisselbd/jev-phishing-bench
- anxkhn/JevPlaysPokemon
- asfarsadewa/human-compiler
- bitnovus/jev-spam-eval
- blink
- Browser Use Olympics + almond-fastloop
- cephalization/jev-triage
- ChetasLua/jevmeter
- citation-verifier
- colinmcdermott/emoji-jev
- Companion, a Jev demo
- Crowdcheck
- Friedjof/jev-mobile
- frostney/clean-code-review
- Gaurav-Gosain/jev-sec-bench
- GiesN/typesafe-jev-workflow
- grmkris/robo-harness
- gtaras7/typesafe-jev
- hegargarcia/jev-playground
- heist-one
- Hollow Creek
- I built a side project to test TypeSafe's Jev model with no generative LLM that scores your project idea
- Jev Driving Lab / typesafe-playground
- Jev for AI Agents: I tested it with rtrvr.ai for browser automation
- Jev plays Pac-Man
- Jev Tac Toe
- Jev Ultrafast (Browser Use)
- jev-bfs (Wikipedia link races)
- jev-doom-agent
- jev-drone
- jev-eval-agent
- jev-gomoku
- jev-headline-bench
- Jev-Moderation-Bot
- jev-play-ping-pong
- jev-rerank
- jev-rerank-bench
- jev-review
- jev-trader
- jev.mods
- jevlike
- Jevsweeper
- jexp/neo4jev
- jgridifier/jev-research-eval
- johnhughes3/LegalForecastBench
- joshlarsen/jev-t-rex-runner
- jourdanlabs/assay-001
- kitze/pagegrade
- kxzk/typesafe-jev-drone-demo
- kyotofin/tax-doc-classifier
- lbotinelly/jev-little-airways
- milanboers/jev-plays-pokemon
- mobile-jev
- Moderation Guard
- openjev
- phureewat29/got-jev
- raihankhan-rk/diffjury
- Ran Jev against an existing classifier eval that previously used Gemini 2.5 Flash Lite
- realZachi/typesafe-adblock
- Room, powered by Jev
- santos-sanz/jev-audio-beeper
- SIEGE (CoreWeave Hacks: Agent Loops 2026)
- siroccomask/snake-jev
- superagents-lab/jev-search
- TarunTomar122/jev-askable-arm
- Tetris x TypeSafe
- teyhouse/jev-secret-detection
- TokenTrim/jev-agent-failure-benchmark
- tsai-civ2 (Jev plays Civilization II)
- tsai-sc (Jev plays StarCraft)
- Tweet Tester: Preview & Score a Post Before You Send It
- TypeSafe AI Jev (SystemOne model) plays Kyrandia 2 against itself: running in circles
- TypeSafe AI Playground (jev.works)
- TypeSafe Typewriter
- typesafe-ai-benchmark
- typesafe-computer-use
- typesafe-mario
- typesafe-minecraft-demo
- typesafe-snake
- unclutter
- usenotra/notra
- vclic/smoking-extraction-benchmark
- Yes / No
- zhuyansen/jev-search-rerank-eval
Tools
View all 110 tools- @ai-sdk/typesafe-ai (Vercel AI SDK provider)
- 0xNatoshi/jev-codex-router
- 24601/Augustus
- AbdelStark/bicameral
- AbdelStark/s1-rs
- abhixhek/jevcal
- AboveColin/HA-Jev
- adarshmishra07/jcm-router
- Advocaat
- ainame/swift-typesafe
- AkashPriyadarshii/jev-curate
- andrelandgraf/typesafe-on-neon
- AntonioCoppe/jev-harness
- aoprisan/typesafe-ai-rust-sdk
- AshutoshVJTI/progressgate
- BeLazy167/typesafe-mod
- binnash/typesafe-sdk (PHP/Laravel)
- blakestone-x/jev-mcp
- Butochnikov/laravel-typesafe-jev
- Butochnikov/typesafe-sdk-php
- codeitlikemiley/typesafe-sdk-rust
- commit-miner
- compozy/yoshi
- CryptoOda/typesafe-guard
- dannote/jev
- devagrawal09/jev-code
- DevMortimer/pi-typesafe
- Dicklesworthstone/skillranker
- docxology/daf-jev
- DomMonte/n8n-nodes-typesafe-ai
- dsh-auto-mode
- FirasSX914/calibre
- Foreman
- gamesonrblx/Jevbridge
- Gaurav-Gosain/jev-go
- geilt/typesafe-cli
- GenieRobot/typesafe-ai-rails
- gilljon/typesafe-ai-rs
- GodsBoy/jev-agent-skill-router
- guillemus/jev-go
- Hawxy/TypeSafeAI.Net
- HyunjunJeon/jev-judgment
- HyunjunJeon/pi-quiet-ask
- itsmostafa/typesafe-mcp
- jamesward/zio-typesafe-ai
- Jev 1.13 on OpenRouter
- Jev Browser (vlad-terin)
- Jev on Cloudflare Workers AI
- Jev on OpenRouter (TypeSafe provider page)
- Jev on Vercel AI Gateway
- jev-me
- jev-router (gargpratyush)
- jev.directory
- jevclient (PyPI)
- jkudish/jev-browser
- jkudish/jev-mcp
- jmanhype/jev-dspy-lab
- jomatsu/pi-jev-auto-mode
- joshmn/typesafe-sdk (Ruby)
- jtsang4/jev-cli
- kazz187/jev-sdk-go
- Kevthetech143/super-jev
- kieranklaassen/ruby_llm-typesafe
- kitze/skillbox
- langchain-typesafe
- leepokai/jev-guard
- legacybridge-tech/pi-typesafe-jev
- ljedrz/nachalnik
- mattn/sqlite3-jev
- mattneel/typesafe (Elixir)
- mejiasd3v/pi-jev-router
- mrnugget/jev-shell-history
- NiazMorshed2007/jev-review
- noelzappy/tripwire
- noplan-inc/limpet
- nshkrdotcom/typesafe_sdk (Elixir)
- pi-warden
- prismhq/jev-router
- rashedInt32/jev-mcp
- reachjalil/jev-tree
- reachjalil/jevlogs
- romaluev/jev-ego
- saibimajdi/typesafe-dotnet-sdk
- samtay32/jev-system-architect
- shantanugoel/ask-jev-skill
- shiftynick/jev-axi
- Stumble/jev-go
- sufianetaouil/every
- supercorp-ai/supercov
- system-one-adapter-python (LLM-backed TypeSafeClient drop-in)
- tamaratran/fast-jev-compaction
- TheoOliveira/pi-jev
- tumf/jev-cli
- Twister915/typesafe-ai
- TypeSafe Agent Skill (docs)
- TypeSafe console playground
- TypeSafe JavaScript SDK docs
- TypeSafe workflow evals site
- typesafe_sdk on Hex
- typesafe-ai/skills (official TypeSafe agent skill)
- typesafe-sdk on PyPI
- typesafe-sdk-js (official TypeScript/JavaScript SDK)
- typesafe-sdk-python (official Python SDK)
- typesend/typesafe_ai (Elixir)
- vercel-labs/ai-cli
- Vicente-MD/jev-resilience
- y0usaf/pi-jev
- Ying-Kai-Liao/jev-browser
- yusukebe/hono-jev-router
- zhirschtritt/typesafe-go
Cookbooks
View all 25 cookbooks- Cookbook: Agent skill suggestion
- Cookbook: Autoresearch feature discovery
- Cookbook: Batching parallel questions
- Cookbook: Classification using confidence
- Cookbook: Classifying RAG passages
- Cookbook: Date extraction
- Cookbook: Double-checking citations
- Cookbook: Function calling from natural language
- Cookbook: Guardrails for LLMs
- Cookbook: Hierarchical classification
- Cookbook: Knowledge graph entity alignment
- Cookbook: Line-by-line semantic search (semantic find)
- Cookbook: Pre-parsed value extraction
- Cookbook: Re-ranking with semantic search
- Cookbook: SDE cascade
- Cookbook: Self-consistency with Choice questions
- Cookbook: Self-consistency with Noul questions
- Cookbook: Structure recovery from plain text (autoformat)
- Demo: Smart home assistant
- Jev 1.13 jaggedness (known limitations)
- Pattern: Composite scoring
- Pattern: Confidence-gated routing
- Pattern: Intent routing
- Pattern: Speculative fan-out
- TypeSafe HTTP API reference
Videos
View all 14 videos- I tested Jev AI: Is it faster than Gemini?
- Is Jev What AI Has Been Missing? I Tested It.
- Jev (Fully Tested) + Browser Use: Fastest AI Agent I've Tried Yet
- Jev AI Is INSANE... 193x Faster Than LLMs?!
- JEV Breakdown: The First AI Model Built For Code
- Jev: The Model That Killed ChatGPT's Core Idea? RLCD Explained
- Jev: The Schema-Safe AI That Could Change Automation Forever
- Livestream Coding with the new TypeSafe AI JEV Model
- Meet Jev: The AI Built to Make Decisions
- System 1 Models Jev Explained: 200ms AI Decisions, Zero Token Streaming
- System One Jev (Fully Explained): Does this really beat Transformer models?
- This New Frontier Model Is Not An LLM.
- What Is Jev, the New Model From TypeSafe AI? (Tech Brew Ride Home)
- wtf is jev?
Articles
View all 35 articles- [AINews] Jev: a System One Model that only decides/classifies/routes/scores
- A deep dive into Jev, TypeSafe's System One model
- AI: too good to be true, too bad to be useful
- An early-access test of TypeSafe's Jev: calibrated judgments for half a cent
- ChatGPT pioneer launches Jev model for programmatic logic
- GIGAZINE: ChatGPT co-developers create Jev, an AI model that processes tasks differently from an LLM
- heise: AI model Jev to make machines decide faster
- How to Use Jev: A practical guide to TypeSafe's System One model
- Introducing System One Models & Jev
- Jev & System One Models: The Claim-vs-Evidence Guide to TypeSafe's Launch
- Jev is the fish at the poker table
- Jev means structured output is interesting again
- Jev: one judge call, or twelve dimension scores? I measured both on three tasks
- Jev: The Language Model That Won't Talk
- Jev: TypeSafe's Decision Model, Speed and Cost Explained
- Jev: TypeSafe's System One Model Explained
- Mini-Vibe Check: TypeSafe's Jev Judged Everything I've Written in 0.7 Seconds
- System One (official docs concept page)
- Testing Jev on public and private data: classifier or filter?
- Testing TypeSafe Jev, Mistral and Gemini for local event validation
- The Bitterest Lesson
- The Neuron Daily: TypeSafe's JEV System One model skips the chatbot part of AI
- The Register: TypeSafe AI debuts model for machines that plays Doom
- Typed Decisions, Not Chat
- TypeSafe AI Emerges From Stealth With $40M in Funding
- TypeSafe AI's Jev Is Not an LLM, And That May Be the Point
- TypeSafe JEV Explained: AI Decisions Without a Chatbot
- TypeSafe Jev Review: The AI Model That Doesn't Generate Text
- TypeSafe Jev: $0.042/1M Decision Model vs Auto-Regressive LLMs and MDLM
- TypeSafe Jev: System One Models Developer Guide
- TypeSafe Jev: the First Decision-Only Model Class, Benchmarked and Priced
- TypeSafe Manifesto
- TypeSafe's Jev Claims 193x Faster and 444x Cheaper. Its Own Eval Scores Against Two Other Models' Answers.
- TypeSafe's Jev Is About to Change the AI Economy
- What Is Jev? How to Implement TypeSafe AI's Decision Model
Discussions
View all 23 discussions- Ask Jev anything, it will judge (X)
- Diogo Almeida's Jev launch thread (X)
- does Jev understand colour? (X)
- eve: criteria-based model routing using Jev (X)
- I literally built the Jev architecture one year back and completely open-sourced it with model, dataset and paper
- I reverse-engineered a jev-like architecture given its type (X)
- Introducing System One Models and Jev (Hacker News launch thread)
- Jev as an AI agent safety monitor (X)
- jev is the best excuse you could possibly have to go re-read 12 factor agents
- Jev outperforms Opus 5 at Pokemon Showdown (X)
- Jev Ultrafast: A browser agent with a dynamic action space (HN)
- kimmonismus on Jev: sounds almost too good to be true (X)
- MLP on Qwen 4B mimicking Jev (X)
- Model router built with Jev (X)
- Open-sourced jev architecture last year with model, paper and dataset (HN)
- r/accelerate: New TypeSafe AI Jev model playing Minecraft (WIP)
- r/PiCodingAgent: Anyone else testing out TypeSafe AI's new System One model?
- r/singularity: TypeSafe AI releases AI model called Jev
- Rethinking security engineering with Jev (X)
- Reverse-engineered Jev-like model (HN)
- Train your own Jev-like model (X)
- TypeSafe AI: we are officially out of stealth (X)
- TypeSafe SDK: Jev, the first System One model (Elixir Forum)
Lists
View all 7 listsAlternatives
View all 22 alternatives- bnsd55/jevmlx
- decider: one-pass typed decisions with calibrated probabilities (Qwen3.5-2B)
- DSPy: programming, not prompting, language models
- ekzhang/openjev-sglang
- GLiNER: generalist lightweight NER
- hr98w/jev-visual
- ikermoel/open-alternative-jev
- Instructor: reliable JSON from any LLM
- jev-on-a-laptop
- kikoncuo/jevfire
- MDLM: masked diffusion language models
- mini-jev: Jev's interface from a frozen LLM's next-token logits
- ModernBERT
- NullPo-jp/PocketJev
- open-jev (JoshuaSP): typed JSON inference with DiffusionGemma
- open-jev: one-pass option scoring with local models
- openjev (zhihz): local bilingual probability decisions
- Outlines: structured outputs for LLMs
- Parallel Constrained Decoding (Qwen2.5-1B-RLCD)
- sales-conversion-model-reinf-learning (claimed 2025 Jev precursor)
- SetFit: efficient few-shot text classification
- TianyuCodings/NanoJev