Jev by @typesafeai is now on OpenRouter, in beta. Jev is a System One model. Instead of generating text, it takes your app's state plus a typed question and returns a typed decision with a probability attached. There is no JSON prompting, parsing layer, and nothing to validate Show more
OfficialRepos & SDKs
Python SDK Usage
The full usage guide for the Python SDK, covering typed calls, model selection, retries, error handling, logging, environment variables, and forward compatibility.
- Category
- Repos & SDKs
- Format
- Docs
- Published by
- TypeSafe AI
- Author
- —
- Added
- 2026-09-25
- Last verified
- 2026-09-25
Highlights
- Shows sync and async client.system_one calls with Noul, Choice, and Score questions.
- Documents base URL overrides for OpenRouter and the Vercel AI Gateway.
- RetryPolicy defaults are shown as max_retries 3, backoff_max 0.2, and timeout 1.0.
- Environment variables include TYPESAFE_API_KEY, TYPESAFE_BASE_URL, and TYPESAFE_DEFAULT_MODEL.
Watch out
Official but vendor-written; it notes request and response bodies are not redacted in debug logs.
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The generated API reference for the official Python SDK, split into sync and async clients, question and response types, retries, exceptions, and constants.
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The official SDK hub: Python and JavaScript/TypeScript clients with typed questions and answers plus automatic retries, and the HTTP API for every other language.
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Usage guide for typesafe-sdk: sync and async clients, uv and pip installs, and one request mixing Noul, Choice, and Score questions with answers grouped by type.
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From the community
Posts from builders shipping with Jev right now.
Jev lands on OpenRouter
700 leads scored for $0.09
JEV is INSANE. We gave it 700 high-intent leads and personalised outreach messages. In 40 seconds, it predicted how each message would perform, assigned a confidence score and detected lead-message mismatches. All for just $0.09. JEV can also score leads, analyse buying Show more
Beating Gemini Flash Lite on an eval
Ran @typesafeai's Jev against an existing classifier eval that previously used Gemini 2.5 Flash Lite. It won both on quality (saturated the eval) and speed (6x)
Browser Use Ultrafast, powered by Jev
Breaking: Browser Use + Jev = Ultrafast ⚡ Findings flights took 7s and cost only $0.0039 🤯 > new action space every step > DOM state space > small LLM fallback to type (this video is at 1x speed btw) Built a tiny open source browser agent. try it below ↓
A really smart switch statement
hype-free explanation of jev: jev does not replace gpt / claude jev is just a *really* smart switch statement like if 2016 ml classifiers got 2026 levels of intelligence it's a new* type of tool that will make a lot of workloads insanely fast, cheap, and accurate * = and by Show more
@CompleteSkeptic
After co-inventing ChatGPT, I kept asking myself: why have superhuman chat models not led to AGI? I’ve spent the last 2 years in stealth building a new way to train models (RLCD), and a new type of frontier AI model that we are releasing today: Jev • 20-200x faster • 40-400x
When a designer gets Jev
when a designer gets access to Jev