Try Jev on your own text
In the Jev AI Playground, paste text, ask a Yes / No, Choice, or Score question, and run TypeSafe's Jev model. New here? Explore an example.
02 Input & questions
Your own case
03 Results
Jev decisions
Your Jev results appear here after Run Jev.
Your own case. Edit the input and questions to run Jev.
Bring your AI tasks together in one place with Jev AI. Choose a model for conversations, writing, coding, learning, and planning. Turn questions into useful answers and ideas into your next piece of work.
Jev is a structured decision model developed by TypeSafe and part of its System One model family. It evaluates supplied information against defined questions and returns choices, scores, or yes/no probabilities.
Jev AI brings structured decisions and everyday AI tasks into one workspace. Jev evaluates a defined question, while chat models produce drafts and explanations. On Jev AI, select the model according to the result your task needs and provide the relevant context.
Jev AI is an all-in-one AI platform that brings multiple AI models into one place. Use available large language models for conversations, writing, coding, learning, and everyday tasks, with the flexibility to choose a model that fits your needs.
Use Jev for classification, scoring, and focused decisions, and choose other AI models for writing, coding, or explanations. Jev AI helps you match the task to the model within a single browser workspace.
Bring your creative projects to Jev AI too: develop image prompts, video scripts, and audio narration with a chat model. Describe your audience and intended format, then refine the wording, structure, and style through follow-up questions.
Jev AI brings model selection, ongoing conversations, and clear pricing into one workspace. Explore the features that help you move from a first question to a useful draft, explanation, or focused evaluation.
Choose among the models listed in Jev AI for different tasks. A writing request, coding question, and focused evaluation may need different approaches. The selector shows model names, organizations, and context limits, helping you make an informed choice before sending your next message.
Open Jev AI in your browser and start with an available model. You do not need to install an SDK or configure provider credentials. The platform manages the connection; account requirements and guest access depend on the selected model and the current settings.
Signed-in conversations on Jev AI are saved to your account, so you can revisit a draft or continue a discussion from the sidebar. Guest records stay in the current browser. Follow-up questions stay in the conversation, letting you refine tone, add context, or request another example.
Jev AI displays input and output credit rates in the model selector. Review those rates and your balance before a longer conversation. Different models can carry different costs. Charges reflect applicable usage, so a concise question and relevant context can help you keep a task focused.
Use Jev for classification, scoring, and specific yes/no judgments. Define the categories or criteria before evaluating your text. Jev AI also offers chat models for written responses, so you can choose an approach that fits the task. Review the result against your original question before taking action.
Use Jev AI to prepare image prompts, video storyboards, and audio scripts. Describe the concept, audience, and tone, then ask a chat model to develop a clear creative brief. Continue the conversation to compare ideas, refine a scene, shorten a narration, or adapt the wording for another format.
Explore classification, scoring, and condition checks with Jev AI. Define one focused question and supply the relevant information. Adapt these Jev AI example inputs to your own customer messages, review criteria, and everyday decisions.
Prepare a classification task for Jev AI with categories such as Billing, Technical Support, or Other. Include a fallback for messages that do not fit, and describe the difference between similar categories.
Message: "I was charged twice." Categories: Billing, Technical Support, Other. Which category fits?
For a scoring task on Jev AI, define what each level means. Distinguish a routine request, a blocked task, and a service outage. Consistent criteria make repeated evaluations easier to compare.
Message: "Our entire team cannot sign in." Rate urgency: 1 = routine request, 2 = one task blocked, 3 = team-wide outage.
Prepare a specific condition for Jev AI, such as whether a customer requests a refund. The yes/no probability describes the model’s judgment, not a guarantee of correctness. Review the source message before acting.
Message: "Please return the duplicate payment." Does the customer request a refund?
Use Jev AI to evaluate your own text with a focused question. The Jev Playground also includes examples if you want to see how questions and inputs work together first.
Paste the message or passage you want Jev to evaluate into Your own case. Keep the relevant context in the input so the judgment has a clear basis.
Choose Yes / No for a condition, Choice for named categories, or Score for ordered levels. Add criteria when the answer needs a more precise boundary.
Select Run Jev to see the structured answer. If you need help designing a task, explore a scenario and compare how its fixed questions respond to different inputs.
Choose a Jev AI model for the result you need. Jev handles structured judgments; chat models generate text. This distinction helps you match each task to an appropriate model.
For coding help on Jev AI, include the language, relevant snippet, error, and expected behavior. Chat models can suggest changes, but this site does not automatically read your repository or execute code. Test suggested fixes in your own environment.
For writing on Jev AI, describe your audience, tone, and desired length. When comparing models, reuse the same prompt and judge their answers against the same requirements. Jev AI makes model switching available, but the final editorial or technical decision remains yours.
| Your task | Model to choose |
|---|---|
| Classify a message into defined categories | Jev |
| Score content against a rubric | Jev |
| Evaluate a specific yes/no condition | Jev |
| Draft an email or rewrite an article | A chat model |
| Explain code or suggest a fix | A chat model |
| Summarize or translate text | A chat model |
Open the Jev AI model selector on the AI Chat page, choose a model for your task, and start in your browser. Model details, sign-in requirements, and prices are shown before you send.
Limited guest chat is available for supported Jev AI models. Guest access to one model does not include every model; check the selector for a sign-in label.
Jev AI uses platform credits. Check input and output prices in the model selector before sending. TypeSafe or OpenRouter API prices are separate from this website’s credit rates. You do not need a personal API key to use the models available here.
Model capabilities, access, credits, and your conversations on Jev AI.
Return to the Jev AI model selector to see what you can use now. Choose an available chat model for your next question, draft, or coding task.
Read practical guides to Jev, decision models, and the questions behind a good comparison.
Model ComparisonsLooking for a Jev alternative? Compare Laya, Kev, Decider, Winnow, OpenJev, structured-output LLMs, and classifiers by deployment needs and practical trade-offs.
Jev TutorialsUse Jev as a Judge to check AI answers against evidence, build clear scoring rubrics, and compare typed evaluation with a traditional LLM judge.
API GuidesA practical guide to the OpenAI Decisions API: what it does, where it fits, what remains unpublished, and how it compares with Jev for everyday AI decisions.
Model GuidesIs Jev open source? Learn what is public, why the official weights are not downloadable, and how independent open source decision models compare with Jev.
Jev AI