# TypeSafe AI — Introducing System One Models & Jev

- Company: TypeSafe AI (typesafe.ai)
- Announced: 2026-09-15
- Category: product-launch
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://typesafe.ai/blog/introducing-system-one-models-and-jev
- Record: https://forck.live/items/12212-introducing-system-one-models-jev
- Subject: Jev / System One
- Models affected: Jev
- Pricing: Input tokens: $0.042 / MTok ($42 per billion tokens). Output tokens: FREE (too cheap to meter).

TypeSafe AI released its first System One Model, Jev, in early access. Jev is optimized for structured outputs and calibrated probabilistic decisions, claims to be two orders of magnitude faster and more efficient than existing LLMs on System One tasks, and cannot hallucinate or make type errors.

## Evidence

Verbatim from https://typesafe.ai/blog/introducing-system-one-models-and-jev:

> Our first public model is Jev , available today in early access. Jev achieves similar levels of intelligence on System One tasks compared to existing LLMs, while being two orders of magnitude faster and more efficient. While Jev gives up string generation, it’s optimized for structured outputs and can’t hallucinate.

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Record: https://forck.live/items/12212-introducing-system-one-models-jev
Catalogue: https://forck.live/llms.txt
Current issue: https://forck.live/feed.md