Master 95% of JEV AI in 7 Minutes
Jev doesn't chat back, it answers a typed question in under half a second, and Kevin Badi walks through what that buys you when you put it in front of Claude or GPT.
September 19thTypeSafe AI's Jev never generates a sentence. It returns a calibrated probability instead, and developers adopted it faster than any model in Vercel's AI Gateway history.
Jev is a non-LLM "System 1" model that replaces generated text with typed, calibrated probabilities for machine-to-machine decisions, and its early adoption suggests structured decision-making, not chat, may be the more automatable use of AI.
Diogo Almeida, who co-invented RLHF and helped build ChatGPT, left OpenAI because years of superhuman chat performance never translated into real automation. His company, TypeSafe AI, built Jev: a transformer that never outputs text, instead returning typed, calibrated probabilities like billing 0.08 or technical 0.85 that code can branch on directly. TypeSafe claims 40 to 200 times the speed of frontier LLMs, roughly 238 times lower cost, and zero hallucination by construction, since output is locked to a predefined schema. Within 24 hours it became the fastest-adopted model in Vercel's AI Gateway history. The catch: it can't chat, skips public benchmarks for its own workflow evals, and independent reviewers note a probability can still be wrong even if it can't be a hallucinated sentence.
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Diogo Almeida, who co-invented RLHF and helped build ChatGPT, says four years of superhuman chat performance never produced real automation, because computers speak a different language than people.

TypeSafe AI, Almeida's company, raised $40M and spent two years in stealth before launching Jev: a transformer-based model that gives back typed probabilities instead of text.

Jev takes unstructured state in and returns typed decisions via three primitives, choice, score, and null, each evaluated in parallel with its own confidence score.

By locking output to a predefined structure, TypeSafe says Jev can't return anything unexpected. Instead of generating tokens one at a time, it produces its full answer in a single hardware-aware pass.

TypeSafe claims 70 to 500 millisecond response times versus 3 to 329 seconds for frontier LLMs, and pricing near $0.042 per million input tokens with free output.

LLMs are overconfident and inconsistent about their own certainty; Jev's calibrated confidence means higher stated confidence tracks higher accuracy. TypeSafe pairs the claim with its own list of caveats.

TypeSafe admits its side-by-side demo against GPT-5.6 Terra was simplified and flattering, then points to workflow evals, run without hand-tuning, as the heavier evidence.

TypeSafe's homepage claims 194 times faster and 445 times cheaper. Its 0% hallucination figure isn't measured, it's guaranteed by schema matching, and The Register pushes back that comparing a language model to a non-language model isn't fully fair.

TypeSafe built a bot that plays Doom from text game-state and ran a Wikipedia link-race, showing Jev finishing in fewer steps than LLM competitors at a fraction of the cost.

Demand got so high TypeSafe briefly couldn't serve API traffic. A Vercel engineer got a safety classifier running 5 to 18 times faster, and within 24 hours Jev became the fastest-adopted model in AI Gateway history.

Vercel and TypeSafe pitch Jev for agent routing, workflow control flow, risk scoring, map-reducing large datasets, and real-time verification. Jev is trained exclusively on synthetic data TypeSafe generates itself.

TypeSafe argues optimizing for the right task beats more data or compute, names the model after the Jevons paradox, skips public benchmarks by choice, and closes with Almeida's take on what frontier labs should actually be selling.
The bottleneck in AI automation isn't model intelligence, it's that most models answer in free text when code actually needs a typed, confident decision.
“We have lightning in a bottle, and yet it is not useful.”
“Useless for a person, perfect for code, because you just branch on it.”
“Extraordinary claims require extraordinary evidence.”
“More like the early internet than today's mega apps.”
“The main product of frontier labs is fear or hype, and he'd like his to be intelligence.”
See every word as it's spoken — crank it to 2× and still catch all of it. The same dual-channel trick behind Amazon's Kindle + Audible.
One of the people who helped build ChatGPT says it broke his heart. Diogo Almeida co-invented RLHF, the technique behind most chat-tuned models, then left OpenAI because years of superhuman chat performance never turned into real automation. His answer is Jev, a model that refuses to speak at all.
The three question types Jev answers: choice returns typed options with probabilities, score returns a numeric estimate, and null-style questions return true/false with a probability.
TypeSafe's framing that optimizing for the right task beats more data, compute, or algorithms: RLHF optimizes for human-preferred text, RLVR only fits programmatically checkable tasks, and neither fits general real-world judgment well.
When a resource gets more efficient to use, total consumption of it tends to rise rather than fall, historically true of coal and steam engines, and TypeSafe's bet for AI intelligence.
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Jev doesn't chat back, it answers a typed question in under half a second, and Kevin Badi walks through what that buys you when you put it in front of Claude or GPT.
September 19thTypeSafe's new model can't write a sentence. It just makes fast, cheap decisions, and a growing list of builders are already wiring it into email triage, trading bots, and self-driving demos.
September 18thAlibaba ships an automated code reviewer, a hobbyist wires public cameras and flight data into one live map, and a comment-section fight over AI 'skills' files splits 3-to-1 in their favor.
September 18thChatGPT co-inventor Diogo Almeida ships a model that's 200x faster and effectively free, but Matthew Berman's own chess test shows it losing on skill, only surviving the clock.
September 18thAlbert Olgaard runs TypeSafe's new Jev model through three playground question types, then builds a model router and a safety guardrail to show what an under-100-millisecond classifier is actually good for.
September 19thA lightweight alternative to built-in computer-use tools: one markdown skill and a handful of Python scripts that let a coding agent click, type, and screenshot its way through any desktop task.
September 15th