JevTracks explains
What is Jev?
The model behind every build on this leaderboard: how it works, what it costs, and what people are actually saying about it.
"x200 faster, x400 cheaper, 0 hallucination, no human in the loop — that's JEV, this is how LLMs will look like."
— Diogo Almeida, TypeSafe AI founder (ex-OpenAI)Not another chatbot
Jev is TypeSafe AI's first "System One model," a different category from the LLMs you're used to.
Most AI models generate text, one token at a time, for a person to read. Jev doesn't write sentences. It takes a block of state (a string, a JSON object, a list of options) and returns a typed decision: a choice, a score, or a probability, each with a calibrated confidence attached, in one parallel pass rather than an autoregressive token stream.
It's named after the Jevons paradox (1865), the idea that as something gets more efficient, people use more of it, not less. "System One" nods to Kahneman's fast, intuitive mode of thinking, as opposed to the slow, deliberate reasoning LLMs do.
Three ways to ask it something
Every Jev request is one of three primitives.
Which option?
Selects the best option from a fixed set, e.g. "which category does this belong to?"
Where on the scale?
Returns a graded value for how well the state matches a given standard.
Is it true? 0 to 1
A probability answer to a yes/no question: is this real, is this eligible, is this true.
"Stripe won't connect for 3 days. Losing sales. Help ASAP."
Speed, cost, and accuracy
Cost per case, from TypeSafe's own workflow evals: same classification task, five models.
Jev's accuracy (67.8%) matches Sonnet 5's, in 0.4s against Sonnet 5's 78.1s.
Watch it in action
TypeSafe AI hasn't published its own YouTube channel. These are the most-watched independent walkthroughs since launch.
Jev: 8 Wild Things People Already Built With TypeSafe's New AI Model
Full Jev (TypeSafe AI) Intro + 50 Use Cases
Jev AI Is INSANE… 193× Faster Than LLMs?!
Livestream Coding With the New TypeSafe AI Jev Model
@0xCodez · shares Diogo Almeida's 36-min tech talk
"Jev Founder, Diogo Almeida (ex-OpenAI): 'The next era is not the Claude Code or Codex era, they are still part of the assistance era with a human in the loop — JEV is what comes next for LLMs.'"
watch on x.comReal brand, real docs
TypeSafe AI's own identity, no invented logo here.
What people are saying
Real posts from X, since the Sept 15 launch.
Explaining why Jev is named after the Jevons paradox: models that are good at talking and bad at deciding.
x.com/CompleteSkeptic
hype-free explanation of jev: jev does not replace gpt / claude. jev is just a *really* smart switch statement.
x.com/NathanFlurry
LLMs vs. Jev, clearly explained! The key difference is not that Jev generates faster. Jev does not generate text at all.
x.com/akshay_pachaar
Quoting the founder: "I believe JEV is the biggest breakthrough we've ever worked on, this sounds too good to be true but it's beating existing benchmarks."
x.com/zodchiiiCopy, benchmarks and quotes sourced from typesafe.ai and docs.typesafe.ai, plus the linked public X posts. Nothing on this page is invented. JevTracks is an unofficial community project and isn't operated by TypeSafe AI.
See what developers have actually shipped with it.
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