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Typesafe - Jev

Build Prod, Not God

Monthly visits
8.5K
Company
TypeSafe AI
Added
2026-09-17 19:56:24
Typesafe - Jev website

About Typesafe - Jev

TypeSafe AI builds machine-native intelligence infrastructure for automation, designed to make decisions within software. Jev is TypeSafe’s first public System One Model, optimized for automation, and it returns structured outputs with probabilities that software can act on.

TypeSafe uses System One models to make fast, structured decisions that software can use directly. Jev evaluates typed questions against a state and returns structured results without text generation or parsing, providing typed values and probability distributions that code can branch on.

Jev delivers calibrated decisions with confidence estimates, so software can decide when to act autonomously or escalate. It produces decisions that are more like code—reliable, fast, and type-safe—rather than human-readable text.

TypeSafe presents information about System One Models and Jev, including how it differs from traditional LLMs, how to get started, and details on questions, patterns, and confidence usage for building systems.

Use cases

  • Jev provides structured decisions with probabilities for software automation.
  • Software can set thresholds to decide when Jev acts autonomously or requests review.
  • Developers can combine Jev’s decisions in code to build larger workflows.

Key features

  • Jev returns typed decisions with calibrated probabilities, so your software can account for uncertainty.
  • Every Jev decision comes with a confidence estimate, so your software can act when confidence is high and escalate when it is not.
  • TypeSafe’s approach emphasizes decisions over strings, enabling code-like reliability and speed.
  • System One models enable sending structured questions and receiving structured answers that software can use directly.

Pros and cons

Pros

Structured outputs that software can act on rather than free-form text.
Confidence estimates accompany decisions for escalation and routing.

Reviews

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Frequently asked questions

What are System One Models?
System One Models are a new class of AI model built for decisions inside software.
What is Jev?
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.
How is Jev different from LLMs?
System One models are built to make fast, structured decisions that software can use directly. No text generation, no parsing.

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