Case archive

Harnesses people actually shipped

Every entry links to its published source. The code is quoted from that source and trimmed, never invented, and performance claims stay attributed to whoever made them.

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Found in the last sweep

A web search runs every 30 minutes and adds anything new it finds about jev harnesses and implementations. These entries are raw search results, not reviewed and not summarised by hand. Last sweep: 23 Sept, 00:30 UTC.

linkedin.com23 Sept, 00:00 UTC

TypeSafe AI Launches Jev System One Model for Fast Structured ...

Are LLMs actually the right tool for software automation? TypeSafe AI just launched Jev, introducing what they call System One Model - a new architecture ...

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mindstudio.ai23 Sept, 00:00 UTC

Jev AI Tested: A Fast "System One" Model for Structured Decisions

What is a “system one” model? It's a term used to describe a model built for fast, low-effort judgments like classification or scoring, as opposed to a model ...

Open
medium.com23 Sept, 00:00 UTC

Jev By TypeSafe : A model you were waiting for! - Medium

A System One model does the quick judgment call that sits inside a software workflow: which queue does this go to, is this action safe, how urgent is this, does ...

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truefoundry.com23 Sept, 00:00 UTC

TypeSafe AI's Jev: What "System One Models" Actually Are - Truefoundry

What a "System One Model" actually is · Parallel sampling. Every field is produced in one pass rather than one token at a time, which is where the speed claim ...

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flaviocopes.com23 Sept, 00:00 UTC

A deep dive into Jev, TypeSafe's System One model - Flavio Copes

System One comes from Thinking, Fast and Slow by Daniel Kahneman. System 1 is fast, intuitive judgment. System 2 is slow, deliberate reasoning. In TypeSafe's ...

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datacamp.com23 Sept, 00:00 UTC

Jev: TypeSafe's System One Model Explained - DataCamp

TypeSafe's Jev is a System One model that returns typed decisions instead of text, running 40-200x faster and 40-400x cheaper than frontier LLMs like GPT-6.

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typesafe.ai23 Sept, 00:00 UTC

Introducing System One Models & Jev - TypeSafe AI Blog

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 ...

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medium.com23 Sept, 00:00 UTC

Meet TypeSafe AI's Decision Model: Jev - Medium

step-by-step explanation of the code with implementation A medical case-study as an example. Agent Harness — A complete guide

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latent.space23 Sept, 00:00 UTC

Jev: System One models for Prod, not God — with Diogo Almeida, CEO ...

Jev: System One models for Prod, not God — with Diogo Almeida, CEO, TypeSafe AI - Jev usecases - speed based - games and computer use - the voice + computer use example we discuss at 1h34 mins - voice + browser control - Jev for coding agents has an official guide - jev for linting - compacting tool calls - reasonable pushback from Theo - Diogo has published a note on the Tyranny of the KV Cache that you should read as a followup after the pod for Jev + coding agents, because of his belief that Cache Rules Everything

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youtube.com23 Sept, 00:00 UTC

Jev and Herdr: The Best Way to Route Models (Must-Try Workflow)

herdr + Jev from Typesafeai: one terminal, three AI subscriptions and I never pick a model by hand. This is the agent and model router setup that is ...

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linkedin.com23 Sept, 00:00 UTC

Shrey Shah's Post - LinkedIn

30 useful Jev use cases Jev is TypeSafe AI's new model for decisions inside software. It does not generate long answers like ChatGPT.

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kenhuangus.substack.com23 Sept, 00:00 UTC

What is JEV from TypeSafe AI? How We implemented Agentic SOC use ...

What is JEV from TypeSafe AI? How We implemented Agentic SOC use cases and other use cases? (Github Repo URL Included in Paid Section) 1 The 27 runners that call only Jev each returned a typed answer from model jev-1.13.0. The reason to continue is the initial Python implementation, the thresholds I would not ship unattended, and the call order that keeps Claude or OpenAI behind a Jev check.

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youtube.com23 Sept, 00:00 UTC

Building a Harness with Jev - YouTube

Building a Harness with Jev If playback doesn't begin shortly, try restarting your device. Building a Harness with Jev Learn all about Jev, a new System One model from TypeSafe AI, and how you can use it in your agent harness. **Use case: auto mode for risky tool calls** **Use case: Jev as a judge for evals** Learn all about Jev, a new System One model from TypeSafe AI, and how you can use it in your agent harness. 6:47 Use case: auto mode for risky tool calls 7:28 Use case: Jev as a judge for evals

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instagram.com22 Sept, 23:30 UTC

Jev is a new System One model from TypeSafe AI designed ... - Instagram

TypeSafe lists Jev at $0.042 per million input tokens, with output tokens free, and reports typical latency of 70–500 ms. The viral 193× faster / 444× cheaper ...

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reddit.com22 Sept, 23:30 UTC

TypeSafe AI releases AI model called Jev. Rather than generating text, it ...

TypeSafe AI releases AI model called Jev. Rather than generating text, it makes decisions. Its hallucination rate is far lower and its outputs are very cheap

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marktechpost.com22 Sept, 23:30 UTC

TypeSafe AI Releases Jev: A System One Model That Returns Typed ...

**Pricing, Speed, and the Benchmark Fine Print** Jev costs $42 per billion input tokens. In its recorded demo, Jev finished in 0.114s for $0.000081. GPT-5.6 Terra took 8.566s for $0.013880. The TypeSafe team claims it to be 193.6x faster and 444.6x cheaper. - TypeSafe says it cannot prove the price is unsubsidized. **What Developers are Building with Jev** - **Email triage**:Bryo AI CTO Nikhil Mudholkar found Gemini slightly more accurate, but 10 to 20 times more expensive. - **Video scoring**: jevmeter scores every sentence of a debate for about $0.05 ( demo on X). Decisions, not strings Cost

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mindstudio.ai22 Sept, 23:30 UTC

Jev Explained: Typesafe AI's Non-Autoregressive System-1 Model

What is Jev, and why does it matter? Typesafe claims this makes Jev up to 100 times faster and 100 times cheaper than conventional LLMs for certain tasks, while remaining competitive on intelligence. TL;DR - **Speed and cost claims are dramatic**: Typesafe states Jev is around 100 times faster and 100 times cheaper than typical LLMs, with input tokens priced at $42 per billion and output tokens offered free. - **The demos were built fast and cheap**, with reported costs as low as about 1 cent for a two-minute Minecraft session and roughly 10 cents for a 15-minute drone simulation. Why does non

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x.com22 Sept, 23:00 UTC

Jev Engineering: The 10-Step Guide to Giving Your Agents a Decision ...

Let the LLM research, write, and generate. Let Jev route, score, approve, or escalate. Let code execute the decision. Jev Engineering is ...

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shop.zimaspace.com22 Sept, 23:00 UTC

Jev Use Cases: 7 Real Decision-Model Builds

These figures remain experimental and self-reported; the case is listed in the Jev engineering directory. ... decision model can replace frontier AI. It ...

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generativeprogrammer.com22 Sept, 23:00 UTC

Jev and LLMs: who does what? - The Generative Programmer

Jev and LLMs: who does what? What is Jev? import { experimental_evaluate as evaluate } from 'ai'; const { answers } = await evaluate({ model: 'typesafe-ai/jev', state: 'Hello, world!', questions: { greeting: { type: 'boolean', instructions: 'Is this a greeting?' }, }, }); console.log(answers.greeting.probability); // Example output: 0.97

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medium.com22 Sept, 23:00 UTC

Jev Engineering: The 10-Step Guide to Building a New “Brain” for AI ...

Jev Engineering: The 10-Step Guide to Building a New “Brain” for AI From Scratch 02. Give it one decision in the Playground Goal: Compare three AI-agent tools in a morning briefing. Completed work: No sources collected yet. Available workers: Researcher, Writer. Constraint: Save drafts for review. Do not publish.

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shop.zimaspace.com22 Sept, 22:30 UTC

Jev Use Cases: 7 Real Decision-Model Builds

These figures remain experimental and self-reported; the case is listed in the Jev engineering directory. ... decision model can replace frontier AI. It ...

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vercel.com22 Sept, 22:30 UTC

7 practical Jev use cases for AI applications - Vercel

Jev, TypeSafe AI's System One model, returns typed decisions and probabilities that application code can act on. Copy link to heading 2. Prioritize support tickets by reported impact TypeSafe's Score question supports ordered levels and returns a score that can fall between them, together with probabilities for the levels. More Build with AI articles - **6 ways to integrate Jev into your application** \ Explore six ways to integrate Jev, including AI SDK, TanStack AI, Cloudflare, LangChain, eve, and TypeSafe's SDKs and HTTP API.

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venturebeat.com22 Sept, 22:30 UTC

Companies are putting Jev in charge of AI agent decisions - VentureBeat

TypeSafe's Jev is designed to replace that step. The model does not generate prose or code; an application sends it a state and typed questions, and Jev returns choices, scores or yes-or-no probabilities with confidence attached. TypeSafe prices Jev at $0.042 per million input tokens with free output, with end-to-end latency reported at 70 to 500 milliseconds. Adoption was immediate: According to Almeida, TypeSafe cleared 140,000 people from the waitlist within 36 hours of Jev going live on September 15, while Vercel said roughly 13% of its paid AI Gateway teams were running it within 24 hours

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