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TypeSafe AI· Released Sep 15

Jev

Jev is TypeSafe AI's first public System One decision model: it answers closed questions (labels, yes/no, scores, choices) with structured output in milliseconds for a fraction of a cent, rather than generating prose.

Smart copy and paste that decides what to pasteSep 20

Entries

Kyle

@kylemclaren · Sep 18

Kyle McLaren released JevQL, which lets vanilla Postgres filter rows by meaning using Jev, with no extension, plus a CLI, SDKs and MCP support.

maxli

@maxlibin · Sep 22

Max Libin built a 3D cube where code does the solving and Jev coaches you, staying quiet while you progress and warning or suggesting a next move after mistakes.

Akash Jain

@akashpurjalkar · Sep 21

Akash Purjalkar built a Minecraft bot where Jev decides actions: it constructs houses, towers, lakes and castles on command and fights mobs while dodging skeleton arrows.

Divine 〽️achine

@Divine_machine · Sep 21

Divine Machine open-sourced a desktop agent that uses Jev for computer use and says it was about 10x faster than a frontier model's native computer use in limited tests.

jai2010

jevstock.vercel.app · Oct 1

Jev Meets the Market: a live trading & markets site by jai2010 where Jev, TypeSafe AI's System One decision model, makes the structured judgments behind the product.

u/davernow

@davernow · Sep 22

Davernow tuned a custom Jev harness with context hints and chained decisions to choose Chinese pronunciations, reporting about one seventh of the cost and one thirtieth of the latency of DeepSeek.

u/arslansov

@arslansov · Sep 22

The author added Jev to a Chrome extension so it chooses the best saved prompt, template or workflow for a goal even when your search words match nothing.

u/Maleficent_College57

@Maleficent_College57 · Sep 22

Jev-gc watches an agent's OpenTelemetry spans and has Jev decide what stays in the next prompt, what turns into a pointer and what gets archived.

u/davertor

@davertor · Sep 22

Davertor built an open-source Chrome extension where Jev scores each post for AI slop and blurs anything over your chosen threshold, with a button to reveal it.

u/Trick-Effective-9186

@Trick-Effective-9186 · Sep 22

A founder rebuilt their survey-research workflow around Jev and reports it came out 85% cheaper and twice as fast as Gemini Flash-Lite on 200 samples.

u/cheeaun

@cheeaun · Sep 22

Cheeaun built an open-source app that scores more than 3,000 emojis against whatever you type with Jev and shows the best matches, a playful take on Jev ranking.

u/eluewisdom

@eluewisdom · Sep 21

Eluewisdom wrote a small Elixir library for Jev that works with TypeSafe and OpenRouter and supports yes/no, choice and score questions, several per request.

u/merijjeyn

@merijjeyn · Sep 21

Jive is an open-source terminal coding agent whose execution graphs mix tool calls with Jev decisions so a frontier model is used only where needed; six tasks ran in about 1.7 to 3.4 minutes.

Jev: quick answers

What can you build with Jev?
People have published 180 public builds made with Jev. The most common uses are productivity (35), coding (29), games (24), agents (23) and content (21).
What are the best Jev GitHub repos?
The most-starred open-source Jev projects in the index are laya: Non-autoregressive System 1 decision engine. Typed choice, score and y, jev-ultrafast: Fastest and cheapest web agent and kev: Jev-like family of decision models built on top of Qwen3.5/3.8 you can.
Where do people share Jev projects?
Mostly on X, GitHub and Web, from 164 creators between Sep 15 and Oct 1.