文章与讨论

Hacker News launch thread

1,800-point thread debating whether typed decisions replace LLM calls for classification, routing, and scoring.

AINews: Jev, a System One Model that only decides

Latent Space's launch-day roundup: over 100x faster and 200x cheaper than small frontier LLMs.

TypeSafe AI debuts model for machines that plays Doom

The Register on the launch, the Doom demo, and the $40M seed round.

Jev: System One models explained

The Neuron's explainer on AI decisions without a chatbot.

Mini-Vibe Check: Jev judged everything I have written in 0.7 seconds

小样本使用评测，不能作为通用准确率保证。

Every's Mike Taylor runs his whole archive through Jev.

Jev: The Language Model That Will Not Talk

Anthony Maio's essay on what a model that cannot generate text is for.

TypeSafe Jev: the first decision-only model class

Release-week technical roundup: API, evals, adapter, and skill.

He says he co-invented ChatGPT. His new AI will not write a word

dev.to walkthrough of the Vercel AI SDK evaluate integration.

Typed decisions, not chat

Independent walkthrough separating TypeSafe's published claims from public evidence.

What is Jev?

Short practical intro with a Python ticket-triage example.

AI that does not talk

Practical guide: playground, Python and JS SDKs, raw HTTP, and the agent skill.

Jev vs Mistral and Gemini for event validation

Head-to-head test at validating local event listings, with cost and latency.

TypeSafeのJevを正しく驚く

Japanese walkthrough of what Jev is and is not.

jev 同士に五目並べで対戦させた

Jev vs Jev gomoku with source and timing logs.

Launch thread by Diogo Almeida

TypeSafe's founder on why RLCD-trained decision models are a shorter path to value than chat models.

Computer use built on Jev

Aaron Levin: 155x cheaper than Opus 5, about 20x faster, and it generalizes across operating systems.

Browser Use + Jev

Gregor Zunic's flight-search demo with a dynamic DOM action space.

Jev Typewriter launch

Steve Krouse's playable 16-judgment demo and video.

Model router built with Jev

Ephraim Duncan's demo where Jev decides which model should serve a request.

Jev vs Qwen on Cerebras

Video comparison against a structured-output LLM baseline.

Internal classifier field note

Matched-precision comparison against a private fine-tuned classifier.

Jev as an agent safety monitor

Test report using Jev to check each agent action first: most attacks caught, almost no false blocks.

Hide posts on X with natural language

Marcel Pociot's browser extension that collapses posts based on a Jev judgment.

Jev plays Minecraft (r/accelerate)

Work-in-progress demo of Jev driving Minecraft, including fleeing zombies at night.

Vercel fx: Jev as a command safety reviewer

Guillermo Rauch: Jev reviews every fx command, faster and more accurate than a chat model.

Stagehand + Jev browser use

Observe the accessibility tree, Jev chooses the next action, Stagehand executes.

OpenCode browser use powered by Jev

Preview of fast browser use with Jev and OpenCode's browser CLI.

Ground Truth news-framing extension

Browser extension that classifies an article's framing, type, topic, and loaded language with Jev.

Jev in a Grammarly-style Mac app

Desktop writing app using Jev for fast structured writing judgments.

Kalshi prediction-market bot

Jev trades 15-minute and 1-hour BTC, ETH, and SOL markets on Kalshi.

Model router CLI

Task plus subscription list in, Jev picks which model or agent should handle it.

Support ticket classifier

Jev labels category, urgency, and human-versus-auto handling for support tickets.

ConsoleChaosRacing driven by Jev

Racing UI wired to Jev driving decisions.

skillbox + Jev skill routing

MCP skill router where Jev picks the relevant skills instead of a long agent search.

jev-rabbit PR review bot

Work-in-progress PR reviewer with plain-English Jev rules.

AIAvatarKit turn-end gate

Voice-dialog turn-end detection using Jev scores after speech.

Early Jev tools roundup

Thread cataloguing the first wave of Jev tools: MCP servers, routers, reviewers, and browser agents.

Jev: System One models explained (DataCamp)

Third-party write-up of the System One primitives, pricing, and vendor workflow evals.

DuckDB Jev classifier

DuckDB extension that classifies rows in CSV, Parquet, or DuckDB tables with Jev, about 10 seconds per 1,000 rows.

Hook panel A/B tester

Near-real-time scoring of TikTok and Instagram hooks against about 100 personas.

Jev gomoku harness

Local tactics shrink 225 moves to about 40 candidates, then Jev picks among tiered options.

ViZDoom Jev agent

Two decision channels on ViZDoom, navigation at 5 Hz and combat at 12 Hz, with an 18-kill test run.

StarCraft Brood War WASM MCP demo

Brood War in WASM exposed as an MCP server, with Jev playing and still losing to a Zerg rush.

Spanish AEPD corpus test

Jev versus a hand-built regex on 544 public data-protection resolutions: 98.2% agreement for about five cents.

Tabletop MMORPG action mapper

Eval of Jev turning free-text player intent into typed server actions: 96% agreement, 317 ms median.

Jev in 34 seconds

Short video explainer of how Jev's typed-decision loop works.

agentjournal ledger tests

25,174 Jev calls for $1.43 across template-trap, multi-dimension, and real-ledger account-coding tasks.

Wiki-link clicker demo

Page-level demo where Jev picks which candidate link to click toward a goal.