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Jev introduces a new shape of LLM - System One, aka Decision Models.

Simon Willison's WeblogAnalysis or commentary··Updated just now
Corroborated event · 2 outlets

Simon Willison released llm-typesafe 0.1a0, a plugin for LLM that adds support for TypeSafe AI's Jev model.

AI brief

TypeSafe AI unveiled Jev, which it describes as the first example of a new category of model it calls "System One models." The post notes the term "decision models" is also used for these.

Written by AI from Simon Willison's Weblog's published text. Read the original for full details.

More coverage of this story (1)

TypeSafe AI's Jev model support added to LLM plugin

Jev: System One models for Prod, not God — with Diogo Almeida, CEO, TypeSafe AI
Latent Space · 21 Sept 2026, 22:13

Primary source

Interpretation or community commentary rather than straight reporting.

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