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Jev introduces a new shape of LLM

Simon Willison's blog post on what changes when a model's output is a typed decision instead of prose.

Articlediscussion
Open source ↗

This summary is based on how curated lists describe the project; its README was not available to review.

Overview

Jev introduces a new shape of LLM is a post on Simon Willison's blog giving his read on what changes when a model's output is a typed decision with probabilities rather than generated prose.

Only the list summary was collected, so the post's specific observations and examples are not reproduced here.

What the decision model decides

TypeQuestionAnswers
OtherWhat does a decision-shaped model change for developers?(inferred)—

How it works

  1. Read the post
  2. Compare typed decisions with prose outputs

Strengths

  • Perspective from a widely read commentator

Caveats

  • Summary only; content not collected

At a glance

Type
Article
Status
discussion
Has code
no
Has tests
no

Use cases and integrations

How curated lists describe it

  • Blog: Simon Willison's read on what changes when a model's output is a typed decision instead of prose.

    yibie/awesome-jev

Frequently asked questions

Who wrote it?

Simon Willison.

What is it about?

How typed-decision output differs from prose for building software.

Where is it?

simonwillison.net, 21 September 2026.

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