Jev directory
Jev Practices & Patterns
296 curated Jev entries. How to design Jev states, questions, and confidence gates the right way, from the official patterns to the failure modes worth designing around.
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All 296 Jev Practices & Patterns
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Vercel CTO Malte Ubl reports that Jev beat an existing classifier eval previously run on Gemini 2.5 Flash Lite, saturating the eval on quality and running 6x faster.
Jev Practices & PatternsPost#community#x#evaluation
Community
A widely read counterpoint to Jev-based context compaction: compaction is reconstruction, not filtering, and scoring tool calls to drop history misunderstands context management.
Jev Practices & PatternsPost#community#x#compaction
Community
The WebMCP benchmark author reports that Jev paired with the small Mercury 2.5 model solved 100% of tasks at roughly 112x lower model cost than GPT-6 Astra with computer use.
Jev Practices & PatternsPost#community#x#benchmark
Community
The three TypeSafe question types, the typed answers they return, how to choose between them, and how to ask several in a single call.
Jev Practices & PatternsDocs#official#primitives#choice
Official
How TypeSafe reports certainty, how it differs from probability, and how to use it architecturally to gate and route decisions.
Jev Practices & PatternsDocs#official#confidence#routing
Official
Architectural patterns for System One systems: speculative fan-out, confidence-gated routing, composite scoring, and intent routing.
Jev Practices & PatternsDocs#official#patterns#architecture
Official
Design AI-powered software by keeping code in control and giving System One narrow, structured decisions to make.
Jev Practices & PatternsDocs#official#patterns#architecture
Official
Explore TypeSafe use cases by industry and turn promising ideas into concrete software workflows.
Jev Practices & PatternsDocs#official#use-cases
Official
Index of all 296 entries
- Jev + Claude Code case study
- SystemOne in SeerScore: workflow review
- SystemOneAffordance
- Jev isn't tricked by ordering, and the others are.
- Jev Does Not Play Dice — kantahayashiai.github.io
- Images and Assets (Dreamer-Ready)
- Box Questions (Dreamer-Ready)
- JevCoder: When Does Decision Delegation Pay Off in Code Repair? (arXiv 2610.19596)
- Jev-Guided Strategy Bandit: Multi-Dimensional Judge Feedback for Query-Efficient Jailbreak Attacks (arXiv 2610.19971)
- Jev Engineering: Typed Decision Systems for Reliable Agent Workflows
- Jev Lab — pasblinn
- Using Jev in Domain Abuse Review: A Workflow Design
- A Thermometer, Not an Analyst: A Text Judge in a Trading Lab
- Laya in shadow, next to Jev on every request
- Jev handed our LLM the wrong page a tenth as often as our embeddings
- Jev review: tested against Fable on 520 posts
- Jev in practice: typed decisions, scoped authority
- Routing Agents with Jev and Laya: Adding System One Decisions to Quarkus LangChain4j
- Recalibrating Many Questions with Few Labels: Minimax Rates and Identification Limits (arXiv 2610.18488)
- Consider, Then Choose: Order-Invariant Decisions in System One Models (arXiv 2610.18233)
- Code Owns the Simulation, Jev Owns the Evaluation (arXiv 2610.01834)
- Judgement in the Age of Jev: From Evaluation Scarcity to Evaluation Abundance (arXiv 2610.01231)
- Hidden Risks of Jev: An Empirical Study of Security, Privacy, and Dual Use (arXiv 2610.04985)
- HydroJEV: A one-second, training-free screen for cyber-attack and fault attribution in water distribution networks (arXiv 2610.02048)
- Calibrated Decision Models for Autonomous Penetration-Testing Harnesses: JEV and Laya as System One Decision Layers for LLM-Driven Pentest Agents (arXiv 2609.28940)
- Decision Hijacking: Prompt Injection Attacks on Jev's Typed Probabilistic Decisions (arXiv 2609.28613)
- RSAJEV: Training-Free Abstaining Prototype Memory for Eliminating Silent Hallucination in JEV-Based Remote Sensing Classification (arXiv 2610.15742)
- FastJEV: Understanding Redundancy for Compact JEV Inference (arXiv 2610.11379)
- System Switch: When Should a Fast Decision Model Stop and Think? (arXiv 2610.09683)
- Can Jev be Your Q or Policy in Reinforcement Learning? (arXiv 2610.11692)
- Visual Jev Rewards: Reference-Bound Verification for Multi-Subject Image Generation (arXiv 2610.09328)
- From Probabilities to Decisions: Search and Multi-Teacher Distillation with Jev (arXiv 2610.09188)
- JevCascade: Readout Stability and Inference-Time Compute Allocation for Prefill-Only Decision Models (arXiv 2610.07716)
- Labels Override Definitions in Jev-Style Typed Decision Models (arXiv 2610.02586)
- Student-Guided Teacher Distillation for Efficient LLM Task Routing: Positioning Against Jev-Style System-1 Classifiers (arXiv 2610.02516)
- LLM-as-Jev: LLMs Are Already Jev-Style Decision Models -- When and How to Fine-Tune Them (arXiv 2610.02076)
- More Choices, Fewer Decisions: Ordinal-Scale Bias in JEV-like Direct-Decision Models (arXiv 2609.38827)
- Dyad: Extending Large Language Models with Native Typed Decision-Making (arXiv 2609.36116)
- Koa-decision: Fast and Consistent Structured Decision Making with Generative LLMs (arXiv 2609.36115)
- PACT: Pairwise-Anchored Calibrated Tuning for Single-Token Typed Decisions (arXiv 2609.35865)
- Type-Safe Is Not Error-Free: Typed Decision Models Follow the Option Name, Not the Definition Bound to It (arXiv 2609.26758)
- JevOut: Natural Context Can Flip Decision Models (arXiv 2609.30243)
- JevForest: Path Voting for Budgeted Feature Acquisition (arXiv 2610.10615)
- Emo-Jev: Probabilistic Reasoning for Emotion Classification with Jev (arXiv 2610.08829)
- When the Right Answer Is Missing: An Arithmetic-Dependent Rejection Bottleneck in Jev (arXiv 2609.39496)
- Decide, Don't Generate: Competitive Dimensional ABSA with Jev's Typed Decisions (arXiv 2609.35293)
- Calibrated Decisions at Scale: Converting Police Crash Narratives into Probabilistic Crash Variables with a System One Model (Jev) (arXiv 2609.24052)
- Reading Right, Acting Wrong: Diagnosing Decision Failures of System One Models in Agent Loops (arXiv 2610.18579)
- Orcha Jev Judgment Spike
- Jev in the Wild (arXiv 2609.30216)
- Jev-Driven SRE Diagnosis: What Worked and What Failed
- Auto-optimizing Jev: Half the Errors, 1/7 the Cost
- Jev Local — Argos1111
- Jev Calibrate
- Jev On A Laptop
- Jev Column Race
- Jeval — rlaope
- Jev RAG Benchmark
- System One — sgoedecke
- System One Open
- TypeAR
- Jev_apps
- Dejevu
- Openvons
- Jev Stock
- Jev Project Context
- AnyDecisionModel
- Jevmory
- Jev.nu
- Hermes And Jev Play Minecraft
- Local Jev — amithgc
- Eikos Arena
- Nanojev Arena
- Laya Browser Agent
- Kev — arjun988
- TypeSafe Local
- Jev Search — larguesa
- Learn Jev End To End
- Decision Index
- LegalForecastBench
- Jev Korean Benchmark
- Jev Lm — y0usaf
- Claude Jev — buchmark
- Jevchess — choxos
- Jevbench — dhruvmehra
- Jev Agent Authorization
- Daf Jev
- Jev Align — caiovicentino
- Jev Codes
- OpenJev — GPT-AGI
- Jevarena — chenmingtang830
- Jev Reward Model Evaluation
- Jev Realtime Trading
- Jev Bot — nssmd
- Jevloop — parkavenue9639
- Sysone Bench
- Jev Model Tokengate
- Reflexbench
- Jev Chat — adhyaay-karnwal
- Openjev — DECRUX9812
- Jev Behavior Study
- Tenbin
- Jev — cobusgreyling
- Jevtest — realZachi
- Rh Guard
- ORIGIN-CIVILIZATION
- cu-Jev
- Jev As Quant
- Ego Jev Ultrafast
- Jev Storyboard Lab
- Jet
- Jev Benchmark — YidiDev
- Cairn Jev Lab
- Jev Guardrails — deepansh-saxena
- System One Gemma
- Jevgpt — Bewinxed
- Trade Jev
- Jev Does Not Play Dice — KantaHayashiAI
- Mcts Agent
- Jev Gate — MongLong0214
- Jev Exploration
- Jev Benchmark — wondertwins
- Siftr
- Jev Mode — ddfeyes
- Research Desk
- Jev Chess — hemanth
- TypeSafe Chess — Dimesio
- Toolgate — RiskAverseTech
- Jev Starter — hamakyo
- Jevbus
- Watfile
- Jevshield
- Polymarket Btc 5M Agent
- TypeSafe Jev MCP
- Ruby LLM Providers TypeSafe
- Jev MCP Server — wangkuangkuang
- Metask Jev
- Bes Kelime Jev
- Dsh Jev Decide
- Jevalyzer
- Jev Deepresearch
- Jev X Kit
- Jev Bot — bl888m
- Openpave Jev
- Jev Reviews
- Open System One
- Jev System One Reference
- Jev Dllm
- Paper Package
- Decisionbridge
- RISC-jeV
- Jev Freeform
- Typed Decisions
- Jev Synergy Screening
- Stuntdouble
- Qwen Rlcd
- Kyotsu AI Bench
- Jev Routing Experiment
- Openjev Experiments
- Padflow Jev Evals
- Jev Carryforward
- Modelsystem
- TypeSafe Vs DeepSeek
- Jev Labs
- Openpoke Meets Jev
- What Is Jev
- Jev Benchmark — themsquared
- System One Security Triage
- Openjev Multimodal
- Yc Jev Bench
- Rerank Bench Jev
- System One — mpuig
- Can Jev Play
- Jev-Research-Index
- LetJevDecide
- Decide — gopaljigaur
- System One Router
- MEDJEV — PAI-CUHK
- Jev Filter
- Jev Zig CLI
- Typesafe_chess_eval
- Jev Shadcn Lint Eval
- System One Adapter Rust
- Jev Deferred Crispification
- Jev Alpha Bench
- Jev Headline Bench
- Jev Report
- Jev Finance Benchmark
- Jevals Data
- Jev Calibration Audit — jujumilk3
- Labs
- Jev Anotacao Sentencas
- Jev Vs Luna
- Jev Lab — Menny1337
- Jev Skillbench
- Misereru Slide Jev
- Shade Arena Jev Monitor
- Jev Certify
- Jev Eval — onlyoneaman
- Jev No Enem
- Jev Jp Address
- Jev Trace Classifier
- FinancialPredictionJev
- Jev Pick And Place Study
- Thaiexam Jev Charts
- Jev Evaluation
- Minojev
- Snbt Jev Bench
- WindTunnel
- Jev Dataops
- Jev is the fish at the poker table
- Jev AI Model in Action: 5 Practical QA Use Cases + Hands-On Demo
- Jev's Architecture Unmasked
- Jev: The Language Model That Won't Talk
- Jev in Search: Three Practical Evaluations
- Jev Engineering: turning an agent stack into a control system
- Local Laya vs cloud Jev on Tetris
- What is Jev? (and is laya better?)
- Is Jev actually good at computer use?
- Run a Jev-Style Model on Your Own GPU
- Is Jev Really Better, Faster and Cheaper? I Put Jev To Test vs. Luna
- Jev vs Jev in Gomoku
- Can LLMs Do What Jev Does? A Replication Attempt
- fx auto mode benchmarked with Jev
- A working note on Jev harnesses for coding agents
- Jev within 5 points of a fine-tune
- Shrinking gomoku from 225 moves to 40
- Workflow evals
- TypeSafe AI Benchmark
- Jevcal
- Jev Rerank Bench
- Jev Eval Agent
- Jev Sec Bench
- Zero-shot email classification with TypeSafe's Jev
- Decider
- SemIf
- Jev Agent Failure Benchmark
- Kev — jaredpalmer
- Jev Search Rerank Eval
- Does Jev know when it doesn't know?
- Jev vs LLM: a phishing decision benchmark with a calibration audit
- Jev Secret Detection
- Jev Benchmarks
- Little Airways
- Janus
- Jev Research Eval
- Jev Playground — hegargarcia
- openJev-verdict-2.0
- Jev DSPy Lab
- Jev Orderby Bench
- JevBench — fstandhartinger
- ASSAY-001
- Jevbetter
- Openjev — daseinlabs
- OpenJev (Verdict)
- Reflex — kshetrajna12
- Jev as a judge for agent evals
- Jev Arena
- Jeff — logan-markewich
- Jev Capability Atlas
- JEVfire
- Poorjev
- Mini-Vibe Check: TypeSafe's Jev Judged Everything I've Written in 0.7 Seconds
- Jev: one judge call, or twelve dimension scores? I measured both on three tasks
- Testing Jev on public and private data: classifier or filter?
- An early-access test of TypeSafe's Jev: calibrated judgments for half a cent
- Testing TypeSafe Jev, Mistral and Gemini for local event validation
- How Much Does a Technical SEO Audit Cost in 2026?
- Jevals — Independent Jev Benchmark for Models That Decide
- A 706K-parameter form filler
- Security decisions that fit Jev
- Reranking 33,047 catalog entries
- Inferring Jev's internals from 1,000 calls
- State
- Jev 1.13 Jaggedness
- Choice
- Score
- Noul
- Advanced: Structure
- Pattern: Composite Scoring
- Pattern: Confidence-Gated Routing
- Pattern: Speculative Fan-Out
- Pattern: Intent Routing
- Building with Jev
- What Can You Build With Jev? Documented Use Cases
- Jev in the Agent Runtime
- Typed Decision Models: Jev and Laya in Agentic AI
- Jev as an LLM Judge
- Jev Beats Gemini Flash Lite on a Classifier Eval
- On Jev-Scored Compaction: A Critique
- Jev + WebMCP Breaks a Benchmark
- Primitives: Choice, Score & Noul
- Confidence
- Patterns
- How to Build with TypeSafe
- Example Use Case Map
Start here with the Jev AI model
Featured entries in practices & patterns.
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
Published evaluations of four automation workflows, security incidents, agent trace observability, invoice processing, and customer service, comparing Jev and frontier LLMs as structured workflows versus single prompts.
Jev Practices & PatternsDocs#official#benchmarks#evaluation
Official
Apache-licensed, locally runnable Jev-style decision models (0.8B, 4B, 9B on Qwen3.5) with released weights, training code, a System One-compatible server, frozen eval suites, and a playground.
Jev Practices & Patterns#community#python#open-models
Community
jaredpalmer/kevPython
jaredpalmer/kevPythonJev AI model articles
Original guides that go deeper on Jev practices & patterns.
Jev's compaction tools keep or drop tool calls instead of summarizing them — the thresholds they fire at, the savings they report, and why 1.14's opt-in 262k context doesn't settle the choice.
Jev Practices & Patterns#compaction#long-context#coding-agents
Read article
Per-tick buy/sell calls on Monad, a five-sleeve Hyperliquid desk, Nifty-50 rankers, and Polymarket confidence gates: how the catalog's trading repos wire Jev in without asking it to predict prices.
Jev Practices & Patterns#trading#markets#gates
Read article
How the box question type turns a crop into a decision: four fractional edges, a presence Noul for missing targets, the cut-off problem, and two patterns worth building.
Jev Practices & Patterns#vision#box#patterns
Read article
From the Jev community
Watch walkthroughs, read the threads, and see what builders are posting.
YouTube: A podcast segment on TypeSafe AI, its $40M raise, and the Jevons paradox behind the name.
YouTube: Gary Explains the catch: Jev understands natural language but answers with structured values and confidence.
YouTube: Sam Witteveen on System 1 thinking, then Choice, Score, and Noul demos, and chained actions.
Hacker News: Pipeable onesie CLI with shell-safety exit codes and a calibrate mode over labelled commands.
frodikarlsson3 pointsShow HN: onesie – An expressive Unix-pipeable CLI for System One models like JevRead the thread on Hacker NewsHacker News: Spoken-language learning with video scenes branching on TypeSafe Jev.
j_rcht1 pointShow HN: Worklaude – learn by speaking; video scenes branch on TypeSafe JEVRead the thread on Hacker NewsHacker News: OpenAI's Luna Decisions API framed as a fast follow to TypeSafe's Jev wave.
matt_d6 pointsOpenAI Answers TypeSafe's Jev with a Decision API Built on LunaRead the thread on Hacker NewsHacker News: Nikola Balić on what made the Jev launch easy to try and easy to share.
nkko2 pointsWhat TypeSafe Got Right with the Jev LaunchRead the thread on Hacker News