Jev glossary
Core ConceptsJev AI modelJev (AI model)jev-latest model
Jev
TypeSafe AI's flagship AI model and the first System One model: typed decisions and calibrated probabilities instead of generated text.
- Category
- Core Concepts
- Also known as
- Jev AI model, Jev (AI model), jev-latest model
- Reading time
- 1 min
- Related terms
- 6
- Directory entries
- 3
- Docs
- docs.typesafe.ai
- Added
- 2026-09-24
Definition
Jev is the model you call through TypeSafe's API. It evaluates a state against typed questions and returns one structured answer per question (a choice, a score, or a probability of yes), so code can branch on the result without parsing prose.
TypeSafe ships it under versioned IDs such as jev-1.13.0, with jev-latest and jev-preview as aliases. The docs describe it as fast and calibrated on common-sense judgment, with known jagged edges around counting, dates, and numeric precision.
Tagsmodelscore
Related terms
Definitions that connect to this one.
System OneThe class of AI models built to make fast, structured decisions software can use directly, named after Kahneman's fast-thinking System 1.Core ConceptsTypeSafe AIThe company behind Jev and the System One API, including the official SDKs, cookbooks, console, and published workflow evals.Core Conceptsjev-latestThe default model alias in the SDKs and docs: the most recent stable official Jev release, currently jev-1.13.0.API & ModelsStateThe content a request asks Jev to evaluate: a string, a named object, or an array of messages, shared by every question in the request.Core ConceptsQuestionA named judgment for Jev to make about the state, defined by an ID, a type, instructions, and criteria for the typed primitives.Core ConceptsJaggednessThe documented set of jev-1.13 failure modes (literal reading, counting, dates, indirection, context rot), each with a guardrail.Evaluation & Training
From the Jev directory
Directory entries that go deeper on this term.
The canonical introduction: Jev is TypeSafe's flagship model and the first System One model. Send state and typed questions, get structured answers your code can use directly.
Jev Guides & ArticlesDocs#docs#official#primitives
Official
TypeSafe AI's product site for Jev, its first System One Model: typed decisions with calibrated confidence, performance and pricing claims, a FAQ, and links to the docs, console, workflow evals, and launch post.
Jev Guides & ArticlesDocs#official#docs#models
Official
The model card for jev-1.13.0: $42 per billion input tokens with free output, a 64k context, 250k tokens per second, and how to list the models your account can call.
Jev Guides & ArticlesDocs#official#docs#models
Official
From the Jev AI model community
Posts from builders shipping with Jev right now.