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Jev TypeScript TutorialTutorialsUse @typesafe-ai/sdk 0.7.0 to call Jev from TypeScript or JavaScript with inferred Choice, Score, and Noul answers.Jev Python TutorialTutorialsInstall typesafe-sdk 0.7.5 and call TypeSafe Jev from Python with Choice, Score, and Noul questions.Jev Images TutorialLearnJev 1.13 and 1.14 accept experimental images with an opt-in header. Start with a presence question before acting on its answer.What is Jev AI?LearnWhat is Jev? Jev is TypeSafe's Jev AI model — a System One model for classification, routing and scoring, not a chat LLM.Jev 1.14 and SDK Migration GuideLearnKeep a versioned model for established text workflows. Upgrade SDKs deliberately, then evaluate experimental images and Box separately.Jev LimitationsLearnWhat Jev cannot do well: generation, math, dates, counting, large noisy state, and other jev-1.13 jagged edges from official docs.Is Jev an LLM?LearnJev is TypeSafe's System One model, not a chat LLM. It understands natural-language state but returns typed Choice, Score, and Noul answers instead of generated text.Getting Started with JevLearnHow to use Jev: get a TypeSafe key or a gateway key, set TYPESAFE_API_KEY, and make your first API call with Playground, cURL, Python, or TypeScript.Jev FAQLearnIndependent answers to common Jev AI questions: what it is, how the API works, pricing, primitives, and limits.Jev APIDevelopersTypeSafe Jev API documentation: authentication, POST /v1/systemone, question types, responses, errors and examples.Jev Box: Locate an Image TargetLearnBox is an experimental Jev 1.14 question returning a rectangle. Check presence separately: an absent target still receives a box.Jev PricingDevelopersJev API pricing from TypeSafe's official models page: $0.042 per million input tokens for Jev 1.13 and 1.14, output free, last verified 2026-10-16.What is TypeSafe AI?LearnTypeSafe AI is the company behind Jev, a System One model for typed decisions. Jev is the model; TypeSafe is the vendor.Jev Patterns and CookbooksLearnThe official TypeSafe patterns and cookbooks, and which hub page to read before you copy one.Jev on OpenRouter and VercelDevelopersCall TypeSafe Jev through OpenRouter or Vercel AI Gateway when you do not have a TypeSafe key yet, or already bill through those platforms.Open-Source System One ModelsDevelopersIndependent decision models and libraries that follow Jev's request shape. Author-reported numbers stay labeled as author-reported.How to Use JevLearnHow to use TypeSafe Jev: get access, send state plus Choice, Score, or Noul questions, and branch on typed answers in Python, TypeScript, or cURL.Jev GitHub and Open SourceDevelopersTypeSafe has not published Jev weights. Official clients are the SDKs. Separate open models now serve the same /v1/systemone shape.Jev with Coding AgentsLearnJev does not replace the model inside a coding agent. It can judge tool calls and other closed decisions while that agent still writes the code.Confidence-Gated RoutingConceptsUse the answer to choose an action and the confidence to decide whether to take it. Thresholds stay in your code.Composite ScoringConceptsSplit one fuzzy judgment into atomic Jev questions, then combine the numbers in code with weights you control.Build a Browser Agent with JevTutorialsArchitecture tutorial for a Jev browser agent: snapshot a numbered action space, fan out operation and target in one request, generate text only for TYPE_TEXT, and verify the outcome in code.Jev Ultrafast ExplainedLearnWhat browser-use/jev-ultrafast is: a browser agent that uses Jev for fast action choices and a small LLM only when it must type text.How Jev Ultrafast WorksLearnJev Ultrafast is a browser agent: it snapshots the page, asks TypeSafe which action to take, and rechecks the DOM node before it clicks or types.Jev as a Decision Layer for AgentsConceptsWhy a browser agent can use Jev for action choice and a small LLM for text: bounded decisions, speculative fan-out, and a separate outcome check.Jev cURL ExamplesTutorialsCall the TypeSafe Jev HTTP API with cURL: authentication, mixed questions, listing models, and error codes.How Jev WorksLearnHow TypeSafe Jev works: architecture, parallel sampler, and how one state is evaluated against typed questions.Jev System One ModelConceptsWhat is a System One model? Jev is TypeSafe's first System One model: fast structured decisions for software, trained with RLCD.Jev ScoreConceptsScore is Jev's ordered rubric primitive. It returns a probability-weighted value, a legend, and confidence.Jev RLCDConceptsRLCD is TypeSafe's name for Reinforcement Learning for Calibrated Decisions, the training method behind Jev's System One probabilities.Jev NoulConceptsNoul is Jev's yes/no primitive. It returns the probability that a statement is true. There is no separate confidence field.Jev ChoiceConceptsChoice is Jev's question type for picking one option from a closed set, with probabilities and confidence.Route Customer Support Tickets with JevRoutingUse Jev Choice, Noul, and Score together to route support tickets, flag urgency, and keep assignment logic in code.Detect Customer Intent with JevClassificationA Jev Choice example for intent detection: closed intents, an other escape hatch, and code that owns the handler map.Score Inbound Leads with JevScoringA Jev Score example for lead quality. Levels describe situations, not adjectives. Do not turn the fractional score into a fake dollar value.Jev Sentiment AnalysisScoringJev sentiment analysis as a Score: ordered tone levels, a full probability distribution, and a code path that escalates angry mail.Moderate User Content with JevModerationIndependent Jev moderation example based on TypeSafe's LLM guardrails pattern: atomic hazard questions, a severity Score, thresholds in code.Filter RAG Passages with JevRAGJev RAG filtering example: one request per passage for relevance, contradiction, and injection — then code decides what reaches the answer model.Route Requests to the Right AI Model with JevRoutingJev as a model router: Choice over snap_judgment, write_text, and deep_reason, then your gateway picks the backend.Classify Documents with JevClassificationDocument-type classification with Jev Choice. Different from customer intent: this page asks what the file is, not what the person wants.Detect Escalations with JevSupportEscalation as a Jev Noul: one yes/no probability, optional criteria, no separate confidence field.Select an Agent Tool with JevAgentsJev tool-selection example inspired by TypeSafe's skill-suggestion cookbook: a Choice over tool names plus a Noul for 'should we call anything?'.Jev UltrafastBrowser AgentBrowser Use's open-source browser agent. Jev chooses the next operation and an observed target.KevDecision ModelQwen-based decision models that serve TypeSafe's /v1/systemone shape so the official Python SDK can point at a local server.LayaDecision ModelNon-autoregressive choice, score, and noul models with an English checkpoint, a multilingual checkpoint, and a router.VonDecision ModelA 395M ModernBERT decision model with Python and TypeScript clients and a /v1/systemone server.SemIfLibraryReads typed option probabilities from a frozen open model. Formerly called OpenJev. Includes a browser demo.AnyJevLibraryNokia Applied Research library that turns an existing LLM into typed decisions, with a no-label mode and a small fitted head.NanoJevResearchA 0.6B Qwen3 decision model with a published training pipeline, evaluated by its authors on maze, Snake, and ViZDoom.jevcDeveloper ToolCompiles policy prose into typed Jev questions plus a reducer that computes the verdict in ordinary code.pi-jev-auto-modeDeveloper ToolA fail-closed permission gate for the Pi coding agent. Deterministic rules run first. Hosted Jev judges what those rules escalate.jevmetricsDeveloper ToolAn alpha OpenTelemetry Collector processor that asks hosted Jev whether a metric is worth keeping, then applies your thresholds.Browser AgentsUse caseHow a browser agent can keep Jev inside a bounded choice: pick an operation and a control the page already listed.Coding-agent gatesUse caseKeep the coding agent that writes code. Use Jev only for allow-or-deny questions whose legal answers are already listed.Metric retentionUse caseAsk Jev whether an unfamiliar metric looks worth keeping, then let Collector policy apply the threshold.OpenRouterIntegrationLists ~typesafe/jev-latest and documents a Decisions API plus a TypeSafe-compatible /api/v1/systemone.Vercel AI GatewayIntegrationModel ID typesafe-ai/jev, used with the AI SDK experimental_evaluate helper.typesafe-sdkIntegrationOfficial Python client. Reviewed release is 0.7.5 (2026-10-20). Install from PyPI and call the hosted System One API.@typesafe-ai/sdkIntegrationOfficial JavaScript and TypeScript client. Reviewed release is 0.7.0 (2026-10-20), requiring Node.js 22+ and adding experimental images and Box.Pydantic AIIntegrationTypeSafeModel turns each field of an agent output type into one Jev question. Install pydantic-ai-slim with the typesafe extra.Browser UseOrganizationBrowser Use publishes jev-ultrafast, an MIT-licensed browser agent that calls hosted TypeSafe Jev for operation and target choices.TypeSafeOrganizationTypeSafe is the vendor that builds Jev, a System One model. Official access is the hosted API and the published SDKs.Jared PalmerOrganizationPublishes Kev, a family of Apache-2.0 decision models with a local /v1/systemone server.NandhaKishorMOrganizationPublishes Laya. Weights linked from the README are under the Hugging Face org convaiinnovations.wfzyxOrganizationPublishes Von, a 395M ModernBERT decision model and /v1/systemone server.TheoLeeCJOrganizationPublishes SemIf, formerly called OpenJev, a library that reads option probabilities from frozen open models.Nokia Applied ResearchOrganizationPublishes AnyJev, a library that reads typed decisions from an existing LLM.TianyuCodingsOrganizationPublishes NanoJev, a 0.6B decision model and training pipeline evaluated on game tasks.doronpOrganizationPublishes jevc, a compiler from agent-policy prose into Jev questions plus a code reducer.jomatsuOrganizationPublishes pi-jev-auto-mode, a fail-closed tool-call gate for the Pi coding agent.ishantanuOrganizationPublishes jevmetrics, an alpha OpenTelemetry Collector processor that scores metric metadata with hosted Jev.