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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296- Docs18
- Repos & sites199
- Videos7
- Posts16
- Articles56
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All 296 Jev Practices & Patterns
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Showing 145–192 of 296 resources
An Astro 5 and TypeScript app that pulls Google Maps restaurant reviews from Apify into Supabase and classifies each one with Jev across five operational pillars, with generative models behind the same interface.
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Community
halfspin-qc/jev-reviewsAstro
halfspin-qc/jev-reviewsAstroAn Apache-2.0 attempt at an open Jev: a System-1 decision model returning calibrated probabilities per option, with option branches packed so answers do not change when the option list is reordered.
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Community
Readyaddy/open_system_onePython
Readyaddy/open_system_onePythonA single Markdown reference for building with jev: API guidance, typed question patterns, known limitations, a worked ticket-router example with offline tests, and a handover template for resuming in a new session.
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Reads typed probabilities out of a masked diffusion language model: a shared Yes/No head with a mask beside each candidate answers choice, boolean and ordered-score questions without generating text. Ships an S1 checkpoint, a 17-suite benchmark and a local HTTP service.
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Community
zhouzihao11/jev-dllmPython
zhouzihao11/jev-dllmPythonAn evidence and reproduction package for a Jev decision study: the original fixed-split result on DBLP to ACM entity matching and SciFact relation verification, a later fresh repeat that did not resolve it, and the graph-synthesis work that followed.
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CompleteDotTech/paper-packagePython
CompleteDotTech/paper-packagePythonPython adapter that turns an existing LLM into a bounded decision function: define one question and its answers, get scores, optionally calibrate on your own examples, then abstain below a threshold you set.
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Community
grishahq/decisionbridgeHTML
grishahq/decisionbridgeHTMLA stunt build where C is compiled and run on a simulated SERV RISC-V CPU whose logic gates are lookup tables of 22 boolean answers that Jev fills in, with the clock, trace and cost on screen.
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Community
i2cjak/RISC-jeVPython
i2cjak/RISC-jeVPythonAn experiment that composes TypeSafe Jev Choice decisions into free-form text: every next character becomes one typed decision over 98 options, with branch backtracking and a final complete/incomplete check.
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Community
kesku/jev-freeformJavaScript
kesku/jev-freeformJavaScriptA research reproduction of the Jev question shape — Choice, Score and Noul answered in one forward pass — trained and measured side by side on encoder backbones and a diffusion LLM, with accuracy, calibration, latency and training cost in one table.
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kotoba-lang/typed-decisionsPython
kotoba-lang/typed-decisionsPythonScreens MEDLINE titles and abstracts for an ADHD systematic review with Jev, scored against the Cohen 2006 Abstract Triage gold labels, with a published rule rather than a bare model verdict.
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A zero-dependency Node proxy that sits in front of Jev, forwards every request unchanged, and reports whether a local decision model would have made the same call on your own traffic.
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An inference-only prototype of a Jev-style decision model on a sub-billion-parameter hybrid backbone, returning typed probability distributions in one forward pass, with its architecture treated as an explicit guess.
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Community
shamazharikh/qwen-rlcdPython
shamazharikh/qwen-rlcdPythonA static HTML dashboard, four commits deep, scoring Jev against two luna variants on Japan's 2026 Common Test. The repo is results only: CSV tables, one JSON file and two HTML pages, with no scripts to regenerate them.
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Community
shibadogcap/kyotsu-ai-benchHTML
shibadogcap/kyotsu-ai-benchHTMLRuns Jev as an LLM router over two public benchmarks, with a no-Jev ablation and RouterArena's own scorer so the numbers sit next to the public leaderboard.
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A single self-contained Python script around AlexWortega/openjev, a Qwen3.5-4B cross-encoder that answers contradiction, entailment or neutral, exposing pair classification, multiple-choice rerank, a library API and a CLI.
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Community
zefir1990/openjev-experimentsPython
zefir1990/openjev-experimentsPythonA public benchmark for the three typed decisions a land-development SaaS actually makes: JSON schemas, anonymized seed rows, and a script that scores any OpenAI-compatible model on accuracy, calibration, cost and latency.
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Community
zsavage8/padflow-jev-evalsPython
zsavage8/padflow-jev-evalsPythonAn MCP server with two tools for agent memory: record writes facts into a per-project ledger as they happen, and recall scores each one against the task you are starting and hands back only what matters.
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Community
Dharundp6/jev-carryforwardTypeScript
Dharundp6/jev-carryforwardTypeScriptThe public contribution surface for modelsystem.one, a curated catalog of System One decision models: systems returning typed choice, score or boolean answers with calibrated probabilities instead of chat text. The site code is private.
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Community
fabricioctelles/modelsystem
fabricioctelles/modelsystemA Vercel-hosted comparison of TypeSafe (Jev) against DeepSeek-flash on speed, tokens, cost and accuracy, backed by per-task Python pipelines, fixture generators and a report script. Eighteen commits, nine issues still open.
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Consensus kernel that wraps Jev as a probabilistic oracle: five paraphrased questions, a stability gate set from the measured noise floor and a 3-of-5 quorum, with TLA+ specs, an AsyncAPI contract and Rust tests generated and gated from them.
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Community
copyleftdev/jev-labsPython
copyleftdev/jev-labsPythonFork of OpenPoke that replaces three yes/no LLM calls with batched Jev questions: important-email screening, a tool-call guardrail for the execution agents, and a relevance re-check on search results, with the old classifier left as the fallback.
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Community
0xShin0221/openpoke-meets-jevPython
0xShin0221/openpoke-meets-jevPythonIndependent research repository on Jev: sourced findings that separate verified claims from vendor marketing repeated by others, a rubric-scored catalog of public Jev repositories, and recurring design patterns with evidence.
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Community
g0runmezadam/what-is-jevPython
g0runmezadam/what-is-jevPythonRunnable benchmark putting Jev, jev-preview and Claude Sonnet 5 through one real agent task — classifying a tool call as readonly, destructive, privileged or exfiltration — on the same 60 labelled cases, with raw per-call results committed.
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Community
themsquared/jev-benchmarkPython
themsquared/jev-benchmarkPythonA reproducible 100-case demo that runs TypeSafe's Jev decision model against OpenAI's Terra and Anthropic's Opus on identical synthetic security evidence, then renders the recorded JSON to a static dashboard with no credentials in the browser.
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A local, open-source System One API compatible with Jev, served by Qwen models over llama.cpp and Metal: Noul, Choice and Score answers with full probability distributions and native image input, with no paid inference API in the loop.
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Community
jev-skills/openjev-multimodalPython
jev-skills/openjev-multimodalPythonAn independent benchmark asking whether Jev can replace an LLM reranker, run over natural-language search across all 6,245 YC companies, plus the live search app it measures: Jev routes the query, BM25 and embeddings retrieve, Jev reranks.
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Community
PPRAMANIK62/yc-jev-benchTypeScript
PPRAMANIK62/yc-jev-benchTypeScriptBenchmark of Jev as a production reranker against Qwen3-Reranker-0.6B on BEIR SciFact and NFCorpus. Ranking quality is a wash, Jev runs about twice as fast with a much tighter tail, and the cross-encoder costs roughly a quarter as much. Every raw API response is committed, so the numbers recompute without an API key.
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Community
denser-org/rerank-bench-jevPython
denser-org/rerank-bench-jevPythonAn open System One decision model on small fine-tuned backbones, served locally through Apple MLX and speaking Jev's request/answer shape. Two model tiers with identity-bound temperatures, calibration fitted to your own labeled decisions, and a comparison ladder that includes the misses. A research prototype.
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Community
mpuig/system-onePython
mpuig/system-onePythonExperiment scoring Jev's decisions on a game with a known right answer: a fair die, exact payouts, one Bet-or-Skip call per offer, judged by expected value rather than by whether the roll wins. Across 12,000 decisions it accepts profitable bets but rarely refuses bad ones.
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Community
carlaiau/can-jev-playTypeScript
carlaiau/can-jev-playTypeScriptBilingual static catalogue of work touching TypeSafe's Jev decision model, split into papers, projects and online materials. Every record carries its relationship to Jev, an evidence level and a verification date in plain JSON, readable without a database or an account.
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Yes/no decision site that asks Jev and a fair in-browser coin and shows whether they agree. One relay call returns a verdict, the probability behind it and how significant a decision Jev thinks it is, behind crisis and not-yes-or-no gates. Plain HTML, no build step, no sign-up.
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Community
choxos/LetJevDecideJavaScript
choxos/LetJevDecideJavaScriptpydecide is one Python client for typed System One decisions — Choice, Score and Noul — over hosted Jev, OpenRouter's Decisions endpoint, local laya on PyTorch or MLX, a sentence-transformers CrossEncoder, or a JSON-prompted LLM fallback.
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Community
gopaljigaur/decidePython
gopaljigaur/decidePythonA Go gateway that speaks the OpenAI and Anthropic APIs and handles model: "auto" by asking a decision model four typed questions about the prompt — topic, complexity, risk and private data — then scoring models in config.yaml and calling the cheapest one above the quality floor.
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Community
mmornati/system-one-routerHTML
mmornati/system-one-routerHTMLMEDJEV is an independent, JEV-inspired research implementation for typed evidence decisions: a clinical record or literature passage, a runtime question and a candidate set supplied at call time, scored into an explicit probability distribution plus calibration scope. Alpha research code, not clinical software.
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Community
PAI-CUHK/MEDJEVPython
PAI-CUHK/MEDJEVPythonjev-filter is a CLI that filters tool output before it reaches your agent and, since 0.3, drives web pages and desktop apps too. Jev picks the next operation and its target among controls the program enumerates itself; the program re-checks and executes, and irreversible steps stop for confirmation.
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Community
apixly-ai/jev-filterPython
apixly-ai/jev-filterPythonjevx is a Zig terminal agent that keeps Codex for code generation and confines Jev, reached through OpenRouter, to bounded choice, noul and score decisions for routing, hazard checks, impact and verification. The Zig side, not the model, holds the permissions and the final control flow.
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Community
SupratimSircar05/jev-zig-cliZig
SupratimSircar05/jev-zig-cliZigA short field note on playing Jev at chess: both sides keep proposing draws in positions that are far from balanced, then go on to win, with the loss probability much lower.
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An eval that puts Jev two questions about shadcn-ui/lint: whether each finding is a real rule violation, and whether the linter's message tells you what to change. It runs the real linter over 131 rule test cases and scores both the detections and the messages.
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Community
blas0/jev-shadcn-lint-evalJavaScript
blas0/jev-shadcn-lint-evalJavaScriptRust port of the Python system-one-adapter: a drop-in stand-in for TypeSafe's `system_one` evaluation API backed by LLM providers instead, so the same questions can be scored against an LLM on cost, speed and intelligence.
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Preprint plus reproducible experiments arguing that per-hop calibration does not compose across a decision pipeline: two lemmas, a Deferred Crispification design law, a BSF-S1 reference architecture, and two weight-free audit metrics.
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Two studies on whether Jev can be turned into a trading signal: Nasdaq-100 headlines and price candles. Publication-day rank IC is +0.24; the window you can actually trade is flat and the long-short loses 18 bps a trade.
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Community
Gaurav-Gosain/jev-alpha-benchGo
Gaurav-Gosain/jev-alpha-benchGoUpworthy's randomized headline A/B tests, filtered to variants that shared an image: Jev picks the click winner 64.5% of the time on a held-out confirmatory split, and 74.7% when the real gap was decisive.
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CommunityGaurav-Gosain/jev-headline-benchGo
Gaurav-Gosain/jev-headline-benchGoAn independent Chinese-language report auditing where Jev's headline numbers come from, plus a reproducible 50-sample Chinese evaluation: 86 of 90 judgments right, ECE 0.070, run for a fraction of a cent.
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HackSing/jev-reportPython
HackSing/jev-reportPythonAn empty GitHub repository named jev-finance-benchmark. The page shows no description, no topics, no commits, no files and no license — there is nothing published here to read, run or evaluate.
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Community
hifizz/jev-finance-benchmark
hifizz/jev-finance-benchmarkGround-truth benchmark data for Jev and six LLMs answering the same typed questions on PubMedQA, Banking77 and HelpSteer2, published as a board plus per-decision JSONL logs so every number can be recomputed.
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Community
Jevals/jevals-data
Jevals/jevals-dataAn unaffiliated, API-only audit of Jev calibration built on roughly 7,000 public HTTP calls, covering abstention, Korean, probabilistic coherence, option order, question interference, caching and latency, with a drift ledger.
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A sparse-checkout research workspace of independent lab write-ups, two of which cover Jev: one on API behaviour, input limits and multilingual evaluation, another on moderation and pre-execution command risk checks.
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kiarina/labsDart
kiarina/labsDartLabDados FGV Direito SP experiment that annotates 12 variables across 120 TJSP civil sentences and compares jev-latest with Gemini 3.8 Flash and GPT-5.6 Luna on accuracy, median latency and cost per thousand sentences.
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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